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Lifshitz Transition and Non‐Fermi Liquid Behavior in Highly Doped Semimetals
Advanced Materials ( IF 27.4 ) Pub Date : 2020-11-25 , DOI: 10.1002/adma.202005742 Kyungrok Kang 1 , Won June Kim 2 , Dohyun Kim 1 , Sera Kim 1 , Byungdo Ji 1 , Dong Hoon Keum 3 , Suyeon Cho 4 , Young‐Min Kim 1 , Sébastien Lebègue 5 , Heejun Yang 1
Advanced Materials ( IF 27.4 ) Pub Date : 2020-11-25 , DOI: 10.1002/adma.202005742 Kyungrok Kang 1 , Won June Kim 2 , Dohyun Kim 1 , Sera Kim 1 , Byungdo Ji 1 , Dong Hoon Keum 3 , Suyeon Cho 4 , Young‐Min Kim 1 , Sébastien Lebègue 5 , Heejun Yang 1
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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 ≈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.
中文翻译：
高掺杂半金属的Lifshitz转变和非费米液体行为
经典的费米液体理论和Drude模型提供了了解大多数金属电阻率的基本方法。在某些金属（包括拓扑半金属）中出现了违反经典理论（称为非费米液体（NFL）传输）的行为，但尚未建立对NFL行为的定量理解。特别是，确定电阻率的非二次温度指数是NFL行为的标志，这仍然是一个令人费解的问题。这里，物理模型以定量解释在高度掺杂的过渡利弗席兹和NFL行为（的≈10载流子密度22厘米-3）单斜的Nb 2硒3被报道。霍尔和磁阻测量，两波段Drude模型以及第一性原理计算证明，单斜Nb 2 Se 3中化学势随温度发生明显变化，这会引起材料发生Lifshitz跃迁和NFL行为。因此，在费米液体理论的框架下，电阻率的非二次温度指数可以通过化学势变化来定量确定。该模型为非平凡运输与NFL行为或新兴材料中塞贝克系数的符号反转提供了新的实验见解。
更新日期：2021-01-04
中文翻译：
高掺杂半金属的Lifshitz转变和非费米液体行为
经典的费米液体理论和Drude模型提供了了解大多数金属电阻率的基本方法。在某些金属（包括拓扑半金属）中出现了违反经典理论（称为非费米液体（NFL）传输）的行为，但尚未建立对NFL行为的定量理解。特别是，确定电阻率的非二次温度指数是NFL行为的标志，这仍然是一个令人费解的问题。这里，物理模型以定量解释在高度掺杂的过渡利弗席兹和NFL行为（的≈10载流子密度22厘米-3）单斜的Nb 2硒3被报道。霍尔和磁阻测量，两波段Drude模型以及第一性原理计算证明，单斜Nb 2 Se 3中化学势随温度发生明显变化，这会引起材料发生Lifshitz跃迁和NFL行为。因此，在费米液体理论的框架下，电阻率的非二次温度指数可以通过化学势变化来定量确定。该模型为非平凡运输与NFL行为或新兴材料中塞贝克系数的符号反转提供了新的实验见解。
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