Lifshitz Transition and Non-Fermi Liquid Behavior in Highly Doped Semimetals
- 주제(키워드) layered semimetals , Lifshitz transition , non-Fermi liquids , temperature-induced chemical potential shifts
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- 발행기관 Wiley-VCH Verlag
- 발행년도 2021
- URI http://www.dcollection.net/handler/ewha/000000175348
- 본문언어 영어
- Published As http://dx.doi.org/10.1002/adma.202005742
- PubMed https://pubmed.ncbi.nlm.nih.gov/33241603
- 저작권 이화여자대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
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 ≈1022 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. © 2020 Wiley-VCH GmbH
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