Weak Localization and Antilocalization in Nodal-Line Semimetals: Dimensionality and Topological Effects

Wei Chen, Hai-Zhou Lu, and Oded Zilberberg
Phys. Rev. Lett. 122, 196603 – Published 17 May 2019
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Abstract

New materials such as nodal-line semimetals offer a unique setting for novel transport phenomena. Here, we calculate the quantum correction to conductivity in a disordered nodal-line semimetal. The torus-shaped Fermi surface and encircled π Berry flux carried by the nodal loop result in a fascinating interplay between the effective dimensionality of electron diffusion and band topology, which depends on the scattering range of the impurity potential relative to the size of the nodal loop. For a short-range impurity potential, backscattering is dominated by the interference paths that do not encircle the nodal loop, yielding a 3D weak localization effect. In contrast, for a long-range impurity potential, the electrons effectively diffuse in various 2D planes and the backscattering is dominated by the interference paths that encircle the nodal loop. The latter leads to weak antilocalization with a 2D scaling law. Our results are consistent with symmetry consideration, where the two regimes correspond to the orthogonal and symplectic classes, respectively. Furthermore, we present weak-field magnetoconductivity calculations at low temperatures for realistic experimental parameters and predict that clear scaling signatures B and lnB, respectively. The crossover between the 3D weak localization and 2D weak antilocalization can be probed by tuning the Fermi energy, giving a unique transport signature of the nodal-line semimetal.

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  • Received 18 January 2019

DOI:https://doi.org/10.1103/PhysRevLett.122.196603

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Wei Chen1,2, Hai-Zhou Lu3,4, and Oded Zilberberg2

  • 1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • 2Institute for Theoretical Physics, ETH Zurich, 8093 Zürich, Switzerland
  • 3Shenzhen Institute for Quantum Science and Engineering and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
  • 4Shenzhen Key Laboratory of Quantum Science and Engineering, Shenzhen 518055, China

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Issue

Vol. 122, Iss. 19 — 17 May 2019

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