Thermodynamic Signatures of Weyl Fermions in NbP

Modic, K. A.; Meng, Tobias; Ronning, Filip; Bauer, Eric D.; Moll, Philip W.; Ramshaw, B. J.

doi:10.1038/s41598-018-38161-7

Title: Thermodynamic Signatures of Weyl Fermions in NbP

Abstract

We present a high magnetic field study of NbP—a member of the monopnictide Weyl semimetal (WSM) family. While the monoarsenides (NbAs and TaAs) have topologically distinct left and right-handed Weyl fermi surfaces, NbP is argued to be “topologically trivial” due to the fact that all pairs of Weyl nodes are encompassed by a single Fermi surface. We use torque magnetometry to measure the magnetic response of NbP up to 60 tesla and uncover a Berry paramagnetic response, characteristic of the topological Weyl nodes, across the entire field range. At the quantum limit B* (≈32 T), τ/B experiences a change in slope when the chemical potential enters the last Landau level. Our calculations confirm that this magnetic response arises from band topology of the Weyl pocket, even though the Fermi surface encompasses both Weyl nodes at zero magnetic field. We also find that the magnetic field pulls the chemical potential to the chiral n = 0 Landau level in the quantum limit, providing a disorder-free way of accessing chiral Weyl fermions in systems that are “not quite” WSMs in zero magnetic field.

Authors:

^[1]; Meng, Tobias ^[2];

^[3];

^[1];

^[4]

Max-Planck-Inst. for Chemical Physics of Solids, Dresden (Germany)
Technische Univ., Dresden (Germany)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Cornell Univ., Ithaca, NY (United States)

Publication Date:: Thu Feb 14 00:00:00 EST 2019

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); German Research Foundation (DFG); European Research Council (ERC)

OSTI Identifier:: 1768515

Report Number(s):: LA-UR-18-29179
Journal ID: ISSN 2045-2322

Grant/Contract Number:: 89233218CNA000001; LDRD 20160616ECR; 1752784; GRK 1621; SFB 1143; 715730

Resource Type:: Accepted Manuscript

Journal Name:: Scientific Reports

Additional Journal Information:: Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; material science; NbP; torque; quantum limit; Weyl semimetal; electronic properties and materials; topological matter

Citation Formats


                    Modic, K. A., Meng, Tobias, Ronning, Filip, Bauer, Eric D., Moll, Philip W., and Ramshaw, B. J. Thermodynamic Signatures of Weyl Fermions in NbP.  United States: N. p., 2019. 
Web.  doi:10.1038/s41598-018-38161-7.

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                    Modic, K. A., Meng, Tobias, Ronning, Filip, Bauer, Eric D., Moll, Philip W., & Ramshaw, B. J. Thermodynamic Signatures of Weyl Fermions in NbP.  United States.  https://doi.org/10.1038/s41598-018-38161-7

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                    Modic, K. A., Meng, Tobias, Ronning, Filip, Bauer, Eric D., Moll, Philip W., and Ramshaw, B. J. Thu .  
"Thermodynamic Signatures of Weyl Fermions in NbP".  United States.  https://doi.org/10.1038/s41598-018-38161-7.  https://www.osti.gov/servlets/purl/1768515.

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@article{osti_1768515,

  title        = {Thermodynamic Signatures of Weyl Fermions in NbP},

  author       = {Modic, K. A. and Meng, Tobias and Ronning, Filip and Bauer, Eric D. and Moll, Philip W. and Ramshaw, B. J.},

  abstractNote = {We present a high magnetic field study of NbP—a member of the monopnictide Weyl semimetal (WSM) family. While the monoarsenides (NbAs and TaAs) have topologically distinct left and right-handed Weyl fermi surfaces, NbP is argued to be “topologically trivial” due to the fact that all pairs of Weyl nodes are encompassed by a single Fermi surface. We use torque magnetometry to measure the magnetic response of NbP up to 60 tesla and uncover a Berry paramagnetic response, characteristic of the topological Weyl nodes, across the entire field range. At the quantum limit B* (≈32 T), τ/B experiences a change in slope when the chemical potential enters the last Landau level. Our calculations confirm that this magnetic response arises from band topology of the Weyl pocket, even though the Fermi surface encompasses both Weyl nodes at zero magnetic field. We also find that the magnetic field pulls the chemical potential to the chiral n = 0 Landau level in the quantum limit, providing a disorder-free way of accessing chiral Weyl fermions in systems that are “not quite” WSMs in zero magnetic field.},

  doi          = {10.1038/s41598-018-38161-7},

  journal      = {Scientific Reports},

  number       = 1,

  volume       = 9,

  place        = {United States},

  year         = {Thu Feb 14 00:00:00 EST 2019},

  month        = {Thu Feb 14 00:00:00 EST 2019}

}

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text, January 2015

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Title: Thermodynamic Signatures of Weyl Fermions in NbP

Abstract

Citation Formats

Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs text, January 2015

Excitonic Phases from Weyl Semimetals journal, November 2012

Observation of Weyl nodes and Fermi arcs in tantalum phosphide text, January 2016

Transport properties of density wave phases in three-dimensional metals and semimetals under high magnetic field journal, May 2017

Quantum limit transport and destruction of the Weyl nodes in TaAs text, January 2017

Quantum oscillations and the Fermi surface topology of the Weyl semimetal NbP journal, March 2016

Superconductivity of doped Weyl semimetals: Finite-momentum pairing and electronic analog of the 3 He- A phase journal, December 2012

Dirac Fermions in Solids - from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals text, January 2013

Magnetic torque anomaly in the quantum limit of Weyl semimetals journal, August 2016

Crystal Structure, Electrical Transport, and Magnetic Properties of Niobium Monophosphide journal, January 1996

Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide journal, August 2015

Observation of Weyl nodes and Fermi arcs in tantalum phosphide journal, March 2016

Quantum limit transport and destruction of the Weyl nodes in TaAs journal, June 2018

Helicity protected ultrahigh mobility Weyl fermions in NbP text, January 2015

Tunable circular dichroism due to the chiral anomaly in Weyl semimetals journal, February 2015

Torque magnetometry in pulsed magnetic fields with use of a commercial microcantilever journal, August 2002

Experimental signatures of the mixed axial–gravitational anomaly in the Weyl semimetal NbP journal, July 2017

Berry phase and band structure analysis of the Weyl semimetal NbP journal, September 2016

Chiral magnetoresistance in the Weyl semimetal NbP journal, March 2017

Discovery of a Weyl fermion semimetal and topological Fermi arcs journal, July 2015

Excitonic Phases from Weyl Semi-Metals text, January 2012

Chiral magnetoresistance in the Weyl semimetal NbP preprint, January 2016

Hydrodynamic theory of thermoelectric transport and negative magnetoresistance in Weyl semimetals text, January 2016

The Adler-Bell-Jackiw anomaly and Weyl fermions in a crystal journal, November 1983

Field-induced phase transition in Kish graphite journal, May 1998

Hydrodynamic theory of thermoelectric transport and negative magnetoresistance in Weyl semimetals journal, August 2016

Dirac Fermions in Solids: From High-T c Cuprates and Graphene to Topological Insulators and Weyl Semimetals journal, March 2014

Chiral anomaly and classical negative magnetoresistance of Weyl metals journal, September 2013

Helicity-protected ultrahigh mobility Weyl fermions in NbP journal, March 2016

Weyl superconductors journal, August 2012

Superconducting proximity effect and Majorana flat bands at the surface of a Weyl semimetal journal, May 2016

Topological surface states and Fermi arcs of the noncentrosymmetric Weyl semimetals TaAs, TaP, NbAs, and NbP journal, September 2015

Quantum oscillations and the Fermi-surface topology of the Weyl semimetal NbP text, January 2015

Tomonaga-Luttinger liquid and localization in Weyl semimetals text, January 2016

Tomonaga-Luttinger liquid and localization in Weyl semimetals journal, May 2017

Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP journal, May 2016

A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class journal, June 2015

Crystal Structure, Electrical Transport, and Magnetic Properties of Niobium Monophosphide journal, January 1996

Magnetic torque anomaly in the quantum limit of Weyl semimetals journal, August 2016

Berry phase and band structure analysis of the Weyl semimetal NbP journal, September 2016

Chiral magnetoresistance in the Weyl semimetal NbP journal, March 2017

Torque magnetometry in pulsed magnetic fields with use of a commercial microcantilever journal, August 2002

Accidental Degeneracy in the Energy Bands of Crystals journal, August 1937

Dirac Fermions in Solids - from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals text, January 2013

Tunable circular dichroism due to the chiral anomaly in Weyl semimetals text, January 2014

Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class text, January 2015

Discovery of a Weyl Fermion semimetal state in NbAs text, January 2015

Experimental signatures of the mixed axial-gravitational anomaly in the Weyl semimetal NbP text, January 2017

Quantum limit transport and destruction of the Weyl nodes in TaAs text, January 2017

Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
text, January 2015

Excitonic Phases from Weyl Semimetals
journal, November 2012

Observation of Weyl nodes and Fermi arcs in tantalum phosphide
text, January 2016

Transport properties of density wave phases in three-dimensional metals and semimetals under high magnetic field
journal, May 2017

Quantum limit transport and destruction of the Weyl nodes in TaAs
text, January 2017

Quantum oscillations and the Fermi surface topology of the Weyl semimetal NbP
journal, March 2016

Superconductivity of doped Weyl semimetals: Finite-momentum pairing and electronic analog of the $^{3}$ He- $A$ phase
journal, December 2012

Dirac Fermions in Solids - from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals
text, January 2013

Magnetic torque anomaly in the quantum limit of Weyl semimetals
journal, August 2016

Crystal Structure, Electrical Transport, and Magnetic Properties of Niobium Monophosphide
journal, January 1996

Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide
journal, August 2015

Observation of Weyl nodes and Fermi arcs in tantalum phosphide
journal, March 2016

Quantum limit transport and destruction of the Weyl nodes in TaAs
journal, June 2018

Helicity protected ultrahigh mobility Weyl fermions in NbP
text, January 2015

Tunable circular dichroism due to the chiral anomaly in Weyl semimetals
journal, February 2015

Torque magnetometry in pulsed magnetic fields with use of a commercial microcantilever
journal, August 2002

Experimental signatures of the mixed axial–gravitational anomaly in the Weyl semimetal NbP
journal, July 2017

Berry phase and band structure analysis of the Weyl semimetal NbP
journal, September 2016

Chiral magnetoresistance in the Weyl semimetal NbP
journal, March 2017

Discovery of a Weyl fermion semimetal and topological Fermi arcs
journal, July 2015

Excitonic Phases from Weyl Semi-Metals
text, January 2012

Chiral magnetoresistance in the Weyl semimetal NbP
preprint, January 2016

Hydrodynamic theory of thermoelectric transport and negative magnetoresistance in Weyl semimetals
text, January 2016

The Adler-Bell-Jackiw anomaly and Weyl fermions in a crystal
journal, November 1983

Field-induced phase transition in Kish graphite
journal, May 1998

Hydrodynamic theory of thermoelectric transport and negative magnetoresistance in Weyl semimetals
journal, August 2016

Dirac Fermions in Solids: From High-T _c Cuprates and Graphene to Topological Insulators and Weyl Semimetals
journal, March 2014

Chiral anomaly and classical negative magnetoresistance of Weyl metals
journal, September 2013

Helicity-protected ultrahigh mobility Weyl fermions in NbP
journal, March 2016

Weyl superconductors
journal, August 2012

Superconducting proximity effect and Majorana flat bands at the surface of a Weyl semimetal
journal, May 2016

Topological surface states and Fermi arcs of the noncentrosymmetric Weyl semimetals TaAs, TaP, NbAs, and NbP
journal, September 2015

Quantum oscillations and the Fermi-surface topology of the Weyl semimetal NbP
text, January 2015

Tomonaga-Luttinger liquid and localization in Weyl semimetals
text, January 2016

Tomonaga-Luttinger liquid and localization in Weyl semimetals
journal, May 2017

Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
journal, May 2016

A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class
journal, June 2015

Crystal Structure, Electrical Transport, and Magnetic Properties of Niobium Monophosphide
journal, January 1996

Magnetic torque anomaly in the quantum limit of Weyl semimetals
journal, August 2016

Berry phase and band structure analysis of the Weyl semimetal NbP
journal, September 2016

Chiral magnetoresistance in the Weyl semimetal NbP
journal, March 2017

Torque magnetometry in pulsed magnetic fields with use of a commercial microcantilever
journal, August 2002

Accidental Degeneracy in the Energy Bands of Crystals
journal, August 1937

Dirac Fermions in Solids - from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals
text, January 2013

Tunable circular dichroism due to the chiral anomaly in Weyl semimetals
text, January 2014

Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
text, January 2015

Discovery of a Weyl Fermion semimetal state in NbAs
text, January 2015

Experimental signatures of the mixed axial-gravitational anomaly in the Weyl semimetal NbP
text, January 2017

Quantum limit transport and destruction of the Weyl nodes in TaAs
text, January 2017