[논문 리뷰] Electronic Transport and quantum oscillation of Topological Semimetals

Jin Hu, Su‐Yang Xu외 2명|arXiv (Cornell University)|2019. 04. 09.

Topological Materials and Phenomena참고 문헌 326인용 수 61

한 줄 요약

3D topological semimetals(DSMs, WSMs, NLSMs, and triple-point semimetals)에 대한 포괄적 리뷰로, 밴드 구조, 양자 진동, 그리고 이국적인 수송 현상에 초점을 맞춥니다.

ABSTRACT

Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and many breakthroughs have been made. Several topological semimetal phases, including Dirac semimetals (DSMs), Weyl semimetals (WSMs), nodal-line semimetals (NLSMs), and triple-point semimetals, have been theoretically predicted and experimentally demonstrated. The low-energy excitation around the Dirac/Weyl nodal points, nodal line, or triply degenerated nodal point can be viewed as emergent relativistic fermions. Experimental studies have shown that relativistic fermions can result in a rich variety of exotic transport properties, e.g., extremely large magnetoresistance, the chiral anomaly, and the intrinsic anomalous Hall effect. In this review, we first briefly introduce band structural characteristics of each topological semimetal phase, then review the current studies on quantum oscillations and exotic transport properties of various topological semimetals, and finally provide a perspective of this area.

연구 동기 및 목표

• 각 위상 토폴로지적 semimetal의 밴드 구조 특성(DIRAC, WEYL, nodal-line, and triple-point)을 소개합니다.
• 토폴로지적 semimetal에서의 양자 진동에 대한 현재 이해를 요약합니다.
• 큰 자화저항, chiral anomaly, 그리고 intrinsic anomalous Hall effect 같은 이국적 수송 특성을 리뷰합니다.
• 필드의 관점과 향후 방향을 제공합니다.

제안 방법

• 토폴로지적 semimetal 위상에 대한 이론적 예측과 실험적 시연을 검토합니다.
• 다양한 semimetal에서의 양자 진동에 대한 연구를 종합합니다.
• nodal points 또는 lines 근처의 emergent relativistic fermion에서 기인한 수송 현상을 논의합니다.

실험 결과

연구 질문

• RQ1 What are the characteristic band structures of DSMs, WSMs, NLSMs, and triple-point semimetals?
• RQ2 How do quantum oscillations manifest in different topological semimetals?
• RQ3 What exotic transport properties arise from emergent relativistic fermions in these materials?
• RQ4 What are the current challenges and future directions in studying topological semimetal transport?

주요 결과

• Topological semimetals host Dirac/Weyl nodes, nodal lines, or triply degenerated points leading to emergent relativistic fermions.
• These materials exhibit exotic transport phenomena including extremely large magnetoresistance, chiral anomaly effects, and intrinsic anomalous Hall effects.
• Quantum oscillations provide insights into the electronic structure and topological nature of these semimetals.
• Experimental and theoretical studies have advanced understanding across multiple topological phases and are subject to ongoing developments.