Lifshitz Transition and Non-Fermi Liquid Behavior in Highly Doped Semimetals

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The classical Fermi liquid theory and Drude model have provided fundamental ways to understand the resistivity of most metals. The violation of the classical theory, known as non-Fermi liquid (NFL) transport, appears in certain metals, including topological semimetals, but quantitative understanding of the NFL behavior has not yet been established. In particular, the determination of the non-quadratic temperature exponent in the resistivity, a sign of NFL behavior, remains a puzzling issue. Here, a physical model to quantitatively explain the Lifshitz transition and NFL behavior in highly doped (a carrier density of approximate to 10(22) cm(-3)) monoclinic Nb2Se3 is reported. Hall and magnetoresistance measurements, the two-band Drude model, and first-principles calculations demonstrate an apparent chemical potential shift by temperature in monoclinic Nb2Se3, which induces a Lifshitz transition and NFL behavior in the material. Accordingly, the non-quadratic temperature exponent in the resistivity can be quantitatively determined by the chemical potential shift under the framework of Fermi liquid theory. This model provides a new experimental insight for nontrivial transport with NFL behavior or sign inversion of Seebeck coefficients in emerging materials.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2021-01
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.33, no.1, pp.2005742

ISSN
0935-9648
DOI
10.1002/adma.202005742
URI
http://hdl.handle.net/10203/280008
Appears in Collection
PH-Journal Papers(저널논문)
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