Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides

von Rohr, F. O.; Orain, J. -C.; Khasanov, R.; Witteveen, C.; Shermadini, Z.; Nikitin, A.; Chang, J.; Wieteska, A. R.; Pasupathy, A. N.; Hasan, M. Z.; Amato, A.; Luetkens, H.; Uemura, Y. J.; Guguchia, Z.

doi:10.1126/sciadv.aav8465

Title: Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides

Abstract

We report on muon spin rotation experiments probing the magnetic penetration depth λ(T) in the layered superconductors in 2H-NbSe₂ and 4H-NbSe₂. The current results, along with our earlier findings on 1T'-MoTe₂ (Guguchia et al.), demonstrate that the superfluid density scales linearly with T_c in the three transition metal dichalcogenide superconductors. Upon increasing pressure, we observe a substantial increase of the superfluid density in 2H-NbSe₂, which we find to correlate with T_c. The correlation deviates from the abovementioned linear trend. A similar deviation from the Uemura line was also observed in previous pressure studies of optimally doped cuprates. This correlation between the superfluid density and T_c is considered a hallmark feature of unconventional superconductivity. Here, we show that this correlation is an intrinsic property of the superconductivity in transition metal dichalcogenides, whereas the ratio T_c/T_F is approximately a factor of 20 lower than the ratio observed in hole-doped cuprates. We, furthermore, find that the values of the superconducting gaps are insensitive to the suppression of the charge density wave state.

Authors:

^[1]; Orain, J. -C. ^[2];

^[2];

^[1]; Shermadini, Z. ^[2]; Nikitin, A. ^[2];

^[1]; Wieteska, A. R. ^[2];

^[2];

^[3];

^[2]; Luetkens, H. ^[2];

^[4];

^[5]

Univ. of Zurich (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Princeton Univ., NJ (United States)
Columbia Univ., New York, NY (United States)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Princeton Univ., NJ (United States)

Publication Date:: Fri Nov 29 00:00:00 EST 2019

Research Org.:: Princeton Univ., NJ (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

Contributing Org.:: Swiss National Science Foundation

OSTI Identifier:: 1626010

Grant/Contract Number:: FG02-05ER46200; 200021_149486; 200021_175935; PZ00P2_174015; DMR-1436095; DMR-1610633; 701647; P300P2-177832

Resource Type:: Accepted Manuscript

Journal Name:: Science Advances

Additional Journal Information:: Journal Volume: 5; Journal Issue: 11; Journal ID: ISSN 2375-2548

Publisher:: AAAS

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Science & Technology - Other Topics

Citation Formats


                    von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., and Guguchia, Z. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides.  United States: N. p., 2019. 
Web.  doi:10.1126/sciadv.aav8465.

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                    von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., & Guguchia, Z. Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides.  United States.  https://doi.org/10.1126/sciadv.aav8465

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                    von Rohr, F. O., Orain, J. -C., Khasanov, R., Witteveen, C., Shermadini, Z., Nikitin, A., Chang, J., Wieteska, A. R., Pasupathy, A. N., Hasan, M. Z., Amato, A., Luetkens, H., Uemura, Y. J., and Guguchia, Z. Fri .  
"Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides".  United States.  https://doi.org/10.1126/sciadv.aav8465.  https://www.osti.gov/servlets/purl/1626010.

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@article{osti_1626010,

  title        = {Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides},

  author       = {von Rohr, F. O. and Orain, J. -C. and Khasanov, R. and Witteveen, C. and Shermadini, Z. and Nikitin, A. and Chang, J. and Wieteska, A. R. and Pasupathy, A. N. and Hasan, M. Z. and Amato, A. and Luetkens, H. and Uemura, Y. J. and Guguchia, Z.},

  abstractNote = {We report on muon spin rotation experiments probing the magnetic penetration depth λ(T) in the layered superconductors in 2H-NbSe2 and 4H-NbSe2. The current results, along with our earlier findings on 1T'-MoTe2 (Guguchia et al.), demonstrate that the superfluid density scales linearly with Tc in the three transition metal dichalcogenide superconductors. Upon increasing pressure, we observe a substantial increase of the superfluid density in 2H-NbSe2, which we find to correlate with Tc. The correlation deviates from the abovementioned linear trend. A similar deviation from the Uemura line was also observed in previous pressure studies of optimally doped cuprates. This correlation between the superfluid density and Tc is considered a hallmark feature of unconventional superconductivity. Here, we show that this correlation is an intrinsic property of the superconductivity in transition metal dichalcogenides, whereas the ratio Tc/TF is approximately a factor of 20 lower than the ratio observed in hole-doped cuprates. We, furthermore, find that the values of the superconducting gaps are insensitive to the suppression of the charge density wave state.},

  doi          = {10.1126/sciadv.aav8465},

  journal      = {Science Advances},

  number       = 11,

  volume       = 5,

  place        = {United States},

  year         = {Fri Nov 29 00:00:00 EST 2019},

  month        = {Fri Nov 29 00:00:00 EST 2019}

}

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Fig. 1: Schematic phase diagram and TF μSR time spectra for NbSe₂. (A) Crystal structure of 2H-NbSe₂. (B) Pressure dependence of T_c and the CDW temperature T_CDW(5). The red arrows mark the pressures at which the T dependence of the penetration depth was measured. The TF spectra, above andmore »

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DOI: 10.48550/arxiv.1603.06482

Fragile superconductivity in the presence of weakly disordered charge density waves
text, January 2018

Yu, Yue; Kivelson, S. A.
arXiv
DOI: 10.48550/arxiv.1809.10160

Electric and magnetic characterization of NbSe2 single crystals: anisotropic superconducting fluctuations above Tc
text, January 2006

Soto, F.; Berger, H.; Cabo, L.
arXiv
DOI: 10.48550/arxiv.cond-mat/0607383

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
text, January 2007

Kohsaka, Y.; Taylor, C.; Fujita, K.
arXiv
DOI: 10.48550/arxiv.cond-mat/0703309

Works referencing / citing this record:

Superconducting order parameter of the nodal-line semimetal NaAlSi
journal, December 2019

Muechler, Lukas; Guguchia, Zurab; Orain, Jean-Christophe
APL Materials, Vol. 7, Issue 12
DOI: 10.1063/1.5124242

Superconducting order parameter of the nodal-line semimetal NaAlSi
text, January 2019

Muechler, Lukas; Guguchia, Zurab; Orain, Jean-Christophe
American Institute of Physics
DOI: 10.5167/uzh-184608

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Title: Unconventional scaling of the superfluid density with the critical temperature in transition metal dichalcogenides

Abstract

Citation Formats

Figures / Tables:

Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba 1 − x Rb x Fe 2 As 2 journal, September 2011

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor journal, November 2015

Nonmonotonic pseudogap in high- T c cuprates journal, January 2009

Spectroscopy of bulk and few-layer superconducting NbSe2 with van der Waals tunnel junctions journal, February 2018

Conventional superconductivity and charge-density-wave ordering in Ba 1 − x Na x Ti 2 Sb 2 O journal, October 2013

Unconventional superconductivity in magic-angle graphene superlattices journal, March 2018

Cooperative coupling of static magnetism and bulk superconductivity in the stripe phase of La 2 − x Ba x CuO 4 : Pressure- and doping-dependent studies journal, December 2016

X-ray scattering studies of 2 H -NbSe 2 , a superconductor and charge density wave material, under high external magnetic fields journal, June 2000

Large, non-saturating magnetoresistance in WTe2 journal, September 2014

Energy-scale phenomenology and pairing via resonant spin–charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors journal, October 2009

Spin and pseudospins in layered transition metal dichalcogenides journal, April 2014

Evidence for a connection between charge density waves and the pressure enhancement of superconductivity in 2H-NbSe2 journal, January 1976

Pseudogap and Charge Density Waves in Two Dimensions journal, May 2008

Gauge-Invariant Theory of the Dynamical Interaction of Charge Density Waves and Superconductivity journal, September 1981

Discovery of a new type of topological Weyl fermion semimetal state in MoxW1−xTe2 journal, December 2016

Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO 3 journal, March 2012

Static Magnetic Order and Superfluid Density of R FeAs ( O , F ) ( R = La , Nd , Ce ) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors journal, February 2009

Signatures of the topological s +− superconducting order parameter in the type-II Weyl semimetal T d-MoTe2 journal, October 2017

Quasiparticle spectra of 2 H − NbSe 2 : Two-band superconductivity and the role of tunneling selectivity journal, October 2015

Magnetic penetration depth in layered compound NbSe2 measured by muon spin relaxation journal, December 1991

Dynamics of Correlated Two-Dimensional Materials: The 2 H − TaSe 2 Case journal, July 1998

Muon spin rotation studies of SmFeAsO 0.85 and NdFeAsO 0.85 superconductors journal, September 2008

Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2 journal, July 2018

The electronic phase diagram of the LaO1−xFxFeAs superconductor journal, February 2009

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates journal, March 2007

Nb–Nb Interactions Define the Charge Density Wave Structure of 2H-NbSe 2 journal, January 2013

Basic similarities among cuprate, bismuthate, organic, Chevrel-phase, and heavy-fermion superconductors shown by penetration-depth measurements journal, May 1991

Flux distribution and penetration depth measured by muon spin rotation in high-T_{c} superconductors journal, February 1988

From Mott state to superconductivity in 1T-TaS2 journal, November 2008

Fermi-surface nesting and the origin of the charge-density wave in Nb Se 2 journal, May 2006

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa 2 Cu 3 O x journal, November 2011

Order parameter fluctuations at a buried quantum critical point journal, April 2012

Two Energy Gaps and Fermi-Surface “Arcs” in NbSe 2 journal, April 2009

μSR studies of the vortex state in type-II superconductors journal, July 2000

The low-temperature electrical and magnetic properties of TaSe2 and NbSe2 journal, January 1970

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa_{2}Cu_{3}O_{x} text, January 2011

Electron pockets in the Fermi surface of hole-doped high-Tc superconductors journal, November 2007

Neutron scattering study of the charge-density wave transitions in 2 H − Ta Se 2 and 2 H − Nb Se 2 journal, July 1977

Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2 journal, July 2016

Type-II Weyl semimetals journal, November 2015

Magnetic-field penetration depth in K3C60 measured by muon spin relaxation journal, August 1991

Ambipolar Nernst Effect in N b S e 2 journal, August 2003

Strong anharmonicity induces quantum melting of charge density wave in 2 H − NbSe 2 under pressure journal, October 2015

Amplitude collective modes in superconductors and their coupling to charge-density waves journal, November 1982

Fermi Surface Sheet-Dependent Superconductivity in 2H-NbSe2 journal, December 2001

Electric and magnetic characterization of NbSe2 single crystals: Anisotropic superconducting fluctuations above TC journal, September 2007

Absence of local fluctuating dimers in superconducting Ir 1 − x ( Pt , Rh ) x Te 2 journal, May 2018

Muon-Spin-Rotation Measurements of the Penetration Depth of the Infinite-Layer Electron-Doped Sr 0.9 La 0.1 CuO 2 Cuprate Superconductor journal, March 2005

Magnetic penetration depth of MgB2 journal, March 2003

A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2 journal, August 2004

Commonalities in phase and mode journal, April 2009

Superconductivity in rubidium-substituted Ba${}_{1-{}x}$Rb${}_{x}$Ti${}_{2}$Sb${}_{2}$O text, January 2014

Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba_{1−x}Rb_{x}Fe_{2}As_{2} text, January 2011

Electrically Switchable Chiral Light-Emitting Transistor journal, April 2014

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides journal, November 2014

Muon spin relaxation and electron/neutron diffraction studies of BaTi 2 (As 1 − x Sb x ) 2 O: Absence of static magnetism and superlattice reflections journal, December 2013

Superconducting properties of noncentrosymmetric superconductor CaIrSi 3 investigated by muon spin relaxation and rotation journal, January 2015

S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe 2 journal, April 2017

Condensation, excitation, pairing, and superfluid density in high- T c superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing journal, September 2004

Fragile superconductivity in the presence of weakly disordered charge density waves journal, April 2019

Charge-Density-Wave Mechanism in 2 H − NbSe 2 : Photoemission Results journal, May 1999

High pressure research using muons at the Paul Scherrer Institute journal, March 2016

Characterization of collective ground states in single-layer NbSe2 journal, November 2015

Quasiparticle Spectra, Charge-Density Waves, Superconductivity, and Electron-Phonon Coupling in 2 H − N b S e 2 journal, February 2004

Superconductivity and Magnetoresistance in Nb Se 2 journal, February 1972

Superconductivity in Weyl semimetal candidate MoTe2 journal, March 2016

Quasiparticle phenomenology for thermodynamics of strong-coupling superconductors journal, August 1973

Superconductivity in rubidium-substituted Ba 1 − x Rb x Ti 2 Sb 2 O journal, March 2014

Universal Correlations between T c and n s m * (Carrier Density over Effective Mass) in High- T c Cuprate Superconductors journal, May 1989

Importance of phase fluctuations in superconductors with small superfluid density journal, March 1995

Basic Similarities among Cuprate, Bismuthate, Organic, Chevrel-Phase, and Heavy-Fermion Superconductors Shown by Penetration-Depth Measurements journal, April 1992

Pseudogap and charge density waves in two dimensions text, January 2007

Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors text, January 2008

Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3 text, January 2012

Characterization of collective ground states in single-layer NbSe2 text, January 2015

Type-II Weyl Semimetals text, January 2015

Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba $_{1 - x}$ Rb $_{x}$ Fe $_{2}$ As $_{2}$
journal, September 2011

Direct evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor
journal, November 2015

Nonmonotonic pseudogap in high- $T_{c}$ cuprates
journal, January 2009

Spectroscopy of bulk and few-layer superconducting NbSe2 with van der Waals tunnel junctions
journal, February 2018

Conventional superconductivity and charge-density-wave ordering in Ba $_{1 - x}$ Na $_{x}$ Ti $_{2}$ Sb $_{2}$ O
journal, October 2013

Unconventional superconductivity in magic-angle graphene superlattices
journal, March 2018

Cooperative coupling of static magnetism and bulk superconductivity in the stripe phase of ${La}_{2 - x} {Ba}_{x} {CuO}_{4}$ : Pressure- and doping-dependent studies
journal, December 2016

X-ray scattering studies of 2 H -NbSe ₂ , a superconductor and charge density wave material, under high external magnetic fields
journal, June 2000

Large, non-saturating magnetoresistance in WTe2
journal, September 2014

Energy-scale phenomenology and pairing via resonant spin–charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors
journal, October 2009

Spin and pseudospins in layered transition metal dichalcogenides
journal, April 2014

Evidence for a connection between charge density waves and the pressure enhancement of superconductivity in 2H-NbSe2
journal, January 1976

Pseudogap and Charge Density Waves in Two Dimensions
journal, May 2008

Gauge-Invariant Theory of the Dynamical Interaction of Charge Density Waves and Superconductivity
journal, September 1981

Discovery of a new type of topological Weyl fermion semimetal state in MoxW1−xTe2
journal, December 2016

Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO ₃
journal, March 2012

Static Magnetic Order and Superfluid Density of $R FeAs (O, F)$ ( $R = La, Nd, Ce$ ) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors
journal, February 2009

Signatures of the topological s +− superconducting order parameter in the type-II Weyl semimetal T d-MoTe2
journal, October 2017

Quasiparticle spectra of $2 H - {NbSe}_{2}$ : Two-band superconductivity and the role of tunneling selectivity
journal, October 2015

Magnetic penetration depth in layered compound NbSe2 measured by muon spin relaxation
journal, December 1991

Dynamics of Correlated Two-Dimensional Materials: The $2 H - {TaSe}_{2}$ Case
journal, July 1998

Muon spin rotation studies of ${SmFeAsO}_{0.85}$ and ${NdFeAsO}_{0.85}$ superconductors
journal, September 2008

Using controlled disorder to probe the interplay between charge order and superconductivity in NbSe2
journal, July 2018

The electronic phase diagram of the LaO1−xFxFeAs superconductor
journal, February 2009

An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
journal, March 2007

Nb–Nb Interactions Define the Charge Density Wave Structure of 2H-NbSe ₂
journal, January 2013

Basic similarities among cuprate, bismuthate, organic, Chevrel-phase, and heavy-fermion superconductors shown by penetration-depth measurements
journal, May 1991

Flux distribution and penetration depth measured by muon spin rotation in high-T_{c} superconductors
journal, February 1988

From Mott state to superconductivity in 1T-TaS2
journal, November 2008

Fermi-surface nesting and the origin of the charge-density wave in $Nb {Se}_{2}$
journal, May 2006

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa $_{2}$ Cu $_{3}$ O $_{x}$
journal, November 2011

Order parameter fluctuations at a buried quantum critical point
journal, April 2012

Two Energy Gaps and Fermi-Surface “Arcs” in ${NbSe}_{2}$
journal, April 2009

μSR studies of the vortex state in type-II superconductors
journal, July 2000

The low-temperature electrical and magnetic properties of TaSe2 and NbSe2
journal, January 1970

Muon spin rotation investigation of the pressure effect on the magnetic penetration depth in YBa_{2}Cu_{3}O_{x}
text, January 2011

Electron pockets in the Fermi surface of hole-doped high-Tc superconductors
journal, November 2007

Neutron scattering study of the charge-density wave transitions in $2 H - Ta {Se}_{2}$ and $2 H - Nb {Se}_{2}$
journal, July 1977

Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2
journal, July 2016

Type-II Weyl semimetals
journal, November 2015

Magnetic-field penetration depth in K3C60 measured by muon spin relaxation
journal, August 1991

Ambipolar Nernst Effect in ${N b S e}_{2}$
journal, August 2003

Strong anharmonicity induces quantum melting of charge density wave in $2 H - {NbSe}_{2}$ under pressure
journal, October 2015

Amplitude collective modes in superconductors and their coupling to charge-density waves
journal, November 1982

Fermi Surface Sheet-Dependent Superconductivity in 2H-NbSe2
journal, December 2001

Electric and magnetic characterization of NbSe2 single crystals: Anisotropic superconducting fluctuations above TC
journal, September 2007

Absence of local fluctuating dimers in superconducting ${Ir}_{1 - x} {(Pt, Rh)}_{x} {Te}_{2}$
journal, May 2018

Muon-Spin-Rotation Measurements of the Penetration Depth of the Infinite-Layer Electron-Doped ${Sr}_{0.9} {La}_{0.1} {CuO}_{2}$ Cuprate Superconductor
journal, March 2005

Magnetic penetration depth of MgB2
journal, March 2003

A ‘checkerboard’ electronic crystal state in lightly hole-doped Ca2-xNaxCuO2Cl2
journal, August 2004

Commonalities in phase and mode
journal, April 2009

Superconductivity in rubidium-substituted Ba${}_{1-{}x}$Rb${}_{x}$Ti${}_{2}$Sb${}_{2}$O
text, January 2014

Muon-spin rotation measurements of the magnetic penetration depth in the iron-based superconductor Ba_{1−x}Rb_{x}Fe_{2}As_{2}
text, January 2011

Electrically Switchable Chiral Light-Emitting Transistor
journal, April 2014

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides
journal, November 2014

Muon spin relaxation and electron/neutron diffraction studies of BaTi $_{2}$ (As $_{1 - x}$ Sb $_{x}$ ) $_{2}$ O: Absence of static magnetism and superlattice reflections
journal, December 2013

Superconducting properties of noncentrosymmetric superconductor ${CaIrSi}_{3}$ investigated by muon spin relaxation and rotation
journal, January 2015

S-Shaped Suppression of the Superconducting Transition Temperature in Cu-Intercalated NbSe ₂
journal, April 2017

Condensation, excitation, pairing, and superfluid density in high- T _c superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing
journal, September 2004

Fragile superconductivity in the presence of weakly disordered charge density waves
journal, April 2019

Charge-Density-Wave Mechanism in $2 H - {NbSe}_{2}$ : Photoemission Results
journal, May 1999

High pressure research using muons at the Paul Scherrer Institute
journal, March 2016

Characterization of collective ground states in single-layer NbSe2
journal, November 2015

Quasiparticle Spectra, Charge-Density Waves, Superconductivity, and Electron-Phonon Coupling in $2 H − {N b S e}_{2}$
journal, February 2004

Superconductivity and Magnetoresistance in Nb ${Se}_{2}$
journal, February 1972

Superconductivity in Weyl semimetal candidate MoTe2
journal, March 2016

Quasiparticle phenomenology for thermodynamics of strong-coupling superconductors
journal, August 1973

Superconductivity in rubidium-substituted Ba $_{1 - x}$ Rb $_{x}$ Ti $_{2}$ Sb $_{2}$ O
journal, March 2014

Universal Correlations between $T_{c}$ and $\frac{n_{s}}{m^{*}}$ (Carrier Density over Effective Mass) in High- $T_{c}$ Cuprate Superconductors
journal, May 1989

Importance of phase fluctuations in superconductors with small superfluid density
journal, March 1995

Basic Similarities among Cuprate, Bismuthate, Organic, Chevrel-Phase, and Heavy-Fermion Superconductors Shown by Penetration-Depth Measurements
journal, April 1992

Pseudogap and charge density waves in two dimensions
text, January 2007

Energy-scale phenomenology and pairing via resonant spin-charge motion in FeAs, CuO, heavy-fermion and other exotic superconductors
text, January 2008

Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
text, January 2012

Characterization of collective ground states in single-layer NbSe2
text, January 2015

Type-II Weyl Semimetals
text, January 2015

Superconductivity in Weyl Semimetal Candidate MoTe2
text, January 2015

Cooperative coupling of static magnetism and bulk superconductivity in the stripe phase of La_2-xBa_xCuO_4: Pressure- and doping-dependent studies
text, January 2016

Spectroscopic evidence for type II Weyl semimetal state in MoTe2
text, January 2016

Fragile superconductivity in the presence of weakly disordered charge density waves
text, January 2018