Phys. Rev. B 102, 075121 (2020)
Nonequilibrium interplay between Andreev bound states and Kondo effect
Jiangbo He1,2, Dong Pan3,4, Guang Yang1,2, Mingli Liu1,2, Jianghua Ying1,2, Zhaozheng Lyu1,2, Jie Fan1,5, Xiunian Jing1,5, Guangtong Liu1,2,5, Bo Lu6, Dong E. Liu7,8, Jianhua Zhao3,4,9,*, Li Lu1,2,5,9,10,†, and Fanming Qu1,2,5,10,‡
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
4 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
5 Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
6 Center for Joint Quantum Studies and Department of Physics, Tianjin University, Tianjin 300072, China
7 State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
8 Frontier Science Center for Quantum Information, Beijing 100084, China
9 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
10 CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
* Corresponding author: jhzhao@semi.ac.cn
† Corresponding author: lilu@iphy.ac.cn
‡ Corresponding author: fanmingqu@iphy.ac.cn
Abstract
Andreev bound states (ABSs), as a close resemblance and a prototype of Majorana bound states, attracted particular interest in semiconductor-superconductor hybrids. So far, ABSs were explored as an equilibrium behavior employing tunneling spectroscopy. Under nonequilibrium, theorists did predict that the local density of states (DOS) of the ABSs split and broaden. We investigated an InAsSb quantum dot coupled to two superconductors to explore the nonequilibrium dynamics of ABSs and their interplay with Kondo effect. Through tunneling spectroscopy, we demonstrated a full picture of the nonequilibrium dynamic splitting and broadening of ABSs, which interplays with the nonequilibrium Kondo DOS. Since the observed features might mimic those in the normal superconductor-topological superconductor or Majorana junctions, our discovery could provide a relevant comparison to benchmark the Majorana signal in future experiments.
