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A Gapped Phase in Semimetallic Td-WTe2 Induced by Lithium Intercalation

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [3];  [2];  [2]
  1. Yale University, New Haven, CT (United States); Energy Sciences Institute, West Haven, Ct (United States); OSTI
  2. Yale University, New Haven, CT (United States); Energy Sciences Institute, West Haven, Ct (United States)
  3. Energy Sciences Institute, West Haven, Ct (United States); Yale University, New Haven, CT (United States)

The Weyl semimetal WTe2 has shown several correlated electronic behaviors, such as the quantum spin Hall effect, superconductivity, ferroelectricity, and a possible exciton insulator state, all of which can be tuned by various physical and chemical approaches. A new electronic phase in WTe2 induced by lithium intercalation is discovered. The new phase exhibits an increasing resistivity with decreasing temperature and its carrier density is almost two orders of magnitude lower than the carrier density of the semimetallic Td phase, probed by in situ Hall measurements as a function of lithium intercalation. The theoretical calculations predict the new lithiated phase to be a potential charge density wave (CDW) phase with a bandgap of ≈0.14 eV, in good agreement with the in situ transport data. The new phase is structurally distinct from the initial Td phase, characterized by polarization-angle-dependent Raman spectroscopy, and large lattice distortions close to 6% are predicted in the new phase. This finding of a new gapped phase in a 2D semimetal demonstrates electrochemical intercalation as a powerful tuning knob for modulating electron density and phase stability in 2D materials.

Research Organization:
Yale University, New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Moore Foundation; National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); Air Force Research Laboratory (AFRL); Office of Naval Research (ONR); Army Research Office (ARO)
Grant/Contract Number:
SC0021965; AC02-05CH11231; AC05-00OR22725
OSTI ID:
1976210
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 24 Vol. 34; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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