Supercond. Sci. Technol. 36, 085012 (2023)
Phase-tunable multiple Andreev reflections in a quantum spin Hall strip
Xue Yang1, Pablo Burset2 and Bo Lu1,3,*
1 Department of Physics and Center for Joint Quantum Studies, Tianjin University, Tianjin 300072, People's Republic of China
2 Department of Theoretical Condensed Matter Physics, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, 28049 Madrid, Spain
3 Tianjin Key Laboratory of Low Dimensional Physics and Preparing Technology, Tianjin University, Tianjin 300072, People's Republic of China
Email: billmarx@tju.edu.cn
Abstract
A quantum spin Hall strip where different edges are contacted by s-wave superconductors with a phase difference φ supports Majorana bound states protected by time-reversal symmetry. We study signatures of these states in a four-terminal setup where two Josephson junctions are built on opposite edges of the strip and the phase difference between superconductors can be controlled by an external flux. Applying a voltage bias across the quantum spin Hall strip results in a sequence of conductance peaks from multiple Andreev reflections (MARs). We find that this so-called subharmonic gap structure is very sensitive to the phase difference and displays a phase-controlled even–odd effect, where all odd spikes disappear when the Majorana states are formed for Φ = π. Moreover, the remaining even spikes split when the superconductors forming the junction have different gap size. We explain these features by showing that any midgap bound states enhance the transmission of the even order MARs, while the reduced density of states at the gap edges suppresses the odd order ones.
