DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ultrafast creation of a light-induced semimetallic state in strongly excited 1T-TiSe2

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Fondazione Istituto Italiano di Tecnologia, Genova (Italy). Graphene Labs; University of Trento, Povo (Italy)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Fondazione Istituto Italiano di Tecnologia, Genova (Italy). Graphene Labs; University of Trento, Povo (Italy); Sorbonne Universite, Paris (France). Institut des Nanosciences de Paris
  6. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Applied Science and Technology; Kavli Energy NanoScience Institute, Berkeley, CA (United States)

Screening, a ubiquitous phenomenon associated with the shielding of electric fields by surrounding charges, has been widely adopted as a means to modify a material’s properties. While most studies have relied on static changes of screening through doping or gating thus far, here we demonstrate that screening can also drive the onset of distinct quantum states on the ultrafast timescale. By using time- and angle-resolved photoemission spectroscopy, we show that intense optical excitation can drive 1T-TiSe2, a prototypical charge density wave material, almost instantly from a gapped into a semimetallic state. By systematically comparing changes in band structure over time and excitation strength with theoretical calculations, we find that the appearance of this state is likely caused by a dramatic reduction of the screening length. In summary, this work showcases how optical excitation enables the screening-driven design of a nonequilibrium semimetallic phase in TiSe2, possibly providing a general pathway into highly screened phases in other strongly correlated materials.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES), Scientific User Facilities Division; Gordon and Betty Moore Foundation; European Research Commission (ERC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2406219
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 19 Vol. 10; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

References (71)

Charge density wave phase suppression in 1T-TiSe2 through Sn intercalation journal October 2021
Mapping the dispersion of the occupied and unoccupied band structure in photoexcited 1T-TiSe2 journal September 2022
Departure from the conical dispersion in epitaxial graphene journal May 2008
PyARPES: An analysis framework for multimodal angle-resolved photoemission spectroscopies journal January 2020
Collapse of long-range charge order tracked by time-resolved photoemission at high momenta journal March 2011
Self-amplified photo-induced gap quenching in a correlated electron material journal October 2016
Time-domain classification of charge-density-wave insulators journal January 2012
Substrate-induced bandgap opening in epitaxial graphene journal September 2007
Non-thermal separation of electronic and structural orders in a persisting charge density wave journal July 2014
Giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor journal August 2014
Dirac cones reshaped by interaction effects in suspended graphene journal July 2011
Correlation-driven electron-hole asymmetry in graphene field effect devices journal January 2022
Evidence for topological defects in a photoinduced phase transition journal October 2018
Light-induced charge density wave in LaTe3 journal November 2019
Optical manipulation of electronic dimensionality in a quantum material journal July 2021
Spin-polarized spatially indirect excitons in a topological insulator journal February 2023
Revealing the order parameter dynamics of 1T-TiSe$$_2$$ following optical excitation journal September 2022
Ultrafast enhancement of electron-phonon coupling via dynamic quantum well states journal June 2023
Hidden Order and Dimensional Crossover of the Charge Density Waves in TiSe2 journal November 2016
Hybrid functionals based on a screened Coulomb potential journal May 2003
A setup for extreme-ultraviolet ultrafast angle-resolved photoelectron spectroscopy at 50-kHz repetition rate journal February 2019
Q uantum ESPRESSO toward the exascale journal April 2020
Many-body interactions in quasi-freestanding graphene journal June 2011
QUANTUM ESPRESSO: a modular and open-source software project for quantum simulations of materials journal September 2009
On the origin of charge-density waves in select layered transition-metal dichalcogenides journal May 2011
Suppression and emergence of charge-density waves at the surfaces of layered 1 T -TiSe 2 and 1 T -TaS 2 by in situ Rb deposition journal December 2010
High-resolution angle-resolved photoemission spectroscopy and microscopy journal December 2020
Laser-assisted photoemission from surfaces journal February 2008
Phase separation in the vicinity of Fermi surface hot spots journal August 2019
Electrically controlled dielectric band gap engineering in a two-dimensional semiconductor journal March 2020
Evidence for pseudo–Jahn-Teller distortions in the charge density wave phase of 1 T − TiSe 2 journal May 2020
Ultrafast transient absorption spectroscopy of the charge-transfer insulator NiO: Beyond the dynamical Franz-Keldysh effect journal September 2020
Electronic structure of TiSe 2 from a quasi-self-consistent G 0 W 0 approach journal February 2021
Excited-state band structure mapping journal February 2022
Exciton-driven renormalization of quasiparticle band structure in monolayer MoS2 journal August 2022
Special points for Brillouin-zone integrations journal June 1976
Electronic properties and superlattice formation in the semimetal TiSe 2 journal November 1976
Band-gap narrowing in heavily doped many-valley semiconductors journal August 1981
High-precision sampling for Brillouin-zone integration in metals journal August 1989
Soft self-consistent pseudopotentials in a generalized eigenvalue formalism journal April 1990
Density-functional theory and strong interactions: Orbital ordering in Mott-Hubbard insulators journal August 1995
Charge-density-wave phase transition in 1 T − TiSe 2 :   Excitonic insulator versus band-type Jahn-Teller mechanism journal May 2002
Temperature-dependent photoemission on 1 T -TiSe 2 : Interpretation within the exciton condensate phase model journal April 2010
Extracting E versus k ⃗ effective band structure from supercell calculations on alloys and impurities journal February 2012
Effects of extrinsic and intrinsic perturbations on the electronic structure of graphene: Retaining an effective primitive cell band structure by band unfolding journal January 2014
Time- and momentum-resolved gap dynamics in Bi 2 Sr 2 CaCu 2 O 8 + δ journal March 2014
Electronic and vibrational properties of TiSe 2 in the charge-density-wave phase from first principles journal September 2015
Influence of optically quenched superconductivity on quasiparticle relaxation rates in Bi 2 Sr 2 CaCu 2 O 8 + δ journal October 2015
Semimetal-to-semiconductor transition and charge-density-wave suppression in 1T−TiSe2−xSx single crystals journal April 2019
Controlling Electron-Phonon Interactions in Graphene at Ultrahigh Carrier Densities journal December 2010
Nonthermal Melting of a Charge Density Wave in TiSe 2 journal July 2011
Clocking the Melting Transition of Charge and Lattice Order in 1 T − TaS 2 with Ultrafast Extreme-Ultraviolet Angle-Resolved Photoemission Spectroscopy journal October 2011
Electron-Phonon Coupling and the Soft Phonon Mode in TiSe 2 journal December 2011
Charge-Carrier Screening in Single-Layer Graphene journal April 2013
Instantaneous Band Gap Collapse in Photoexcited Monoclinic VO 2 due to Photocarrier Doping journal November 2014
Ultrafast Electronic Band Gap Control in an Excitonic Insulator journal August 2017
Critical Role of the Exchange Interaction for the Electronic Structure and Charge-Density-Wave Formation in TiSe 2 journal October 2017
Ultrafast Modification of Hubbard U in a Strongly Correlated Material: Ab initio High-Harmonic Generation in NiO journal August 2018
Orbital- and k z -Selective Hybridization of Se 4 p and Ti 3 d States in the Charge Density Wave Phase of TiSe 2 journal February 2019
Light-Induced Renormalization of the Dirac Quasiparticles in the Nodal-Line Semimetal ZrSiSe journal August 2020
Carrier-Density Control of the Quantum-Confined 1T−TiSe2 Charge Density Wave journal May 2023
Ultrafast Switching from the Charge Density Wave Phase to a Metastable Metallic State in 1T−TiSe2 journal May 2023
Generalized Gradient Approximation Made Simple journal October 1996
Evolution of the Electronic Structure of 1 T − Cu x TiSe 2 journal October 2007
Excitonic and lattice contributions to the charge density wave in 1 T − TiS e 2 revealed by a phonon bottleneck journal September 2019
Angle-resolved photoemission studies of the cuprate superconductors journal April 2003
Colloquium: Nonthermal pathways to ultrafast control in quantum materials journal October 2021
Ultrafast dynamics of vibrational symmetry breaking in a charge-ordered nickelate journal November 2017
Light-Induced Superconductivity in a Stripe-Ordered Cuprate journal January 2011
Tracking Cooper Pairs in a Cuprate Superconductor by Ultrafast Angle-Resolved Photoemission journal May 2012
Ultrafast Switching to a Stable Hidden Quantum State in an Electronic Crystal journal April 2014

Similar Records

Related Subjects