Optical conductivity of the Majorana mode at the s- and d-wave topological superconductor edge

• 成果类型: Article
• 署名作者: Kamra, Lina Johnsen; Lu, Bo; Linder, Jacob; Tanaka, Yukio; Nagaosa, Naoto
• 署名单位: Norwegian University of Science & Technology (NTNU); Autonomous University of Madrid; Autonomous University of Madrid; Massachusetts Institute of Technology (MIT); Tianjin University; Nagoya University; Nagoya University; RIKEN; RIKEN
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12313
• DOI: 10.1073/pnas.2404009121
• 发表日期: 2024-10-01
• 关键词: high-temperature superconductivity; signature; nanowire; fermions; bi2se3; STATES

摘要

The Majorana fermion offers fascinating possibilities such as non-Abelian statistics , nonlocal robust qubits , hunting it is one of the most important topics in current condensed matter physics. Most of the efforts have been focused on the Majorana bound state at zero energy in terms of scanning tunneling spectroscopy searching for the quantized conductance. On the other hand, a chiral Majorana edge channel appears at the surface of a three-dimensional topological insulator when engineering an interface between proximity-induced superconductivity and ferromagnetism. Recent advances in microwave spectroscopy of topological edge states open a new avenue for observing signatures of such Majorana edge states through the local optical conductivity. As a guide to future experiments, we show how the local optical conductivity and density of states present distinct qualitative features depending on the symmetry of the superconductivity, that can be tuned via the magnetization and temperature. In particular, the presence of the Majorana edge state leads to a characteristic nonmonotonic temperature dependence achieved by tuning the magnetization.