Magnetic flux control of chiral Majorana edge modes in topological superconductor

• 来源期刊: 中国科学:物理学 力学 天文学（英文版）
• 年，卷（期）: 2018,（12）
• 页码范围: 89-94
• 页数: 6页
• 语种: 英文

摘要

We study the transport of chiral Majorana edge modes (CMEMs) in a hybrid quantum anomalous Hall insulator-topological superconductor (QAHI-TSC) system in which the TSC region contains a Josephson junction and a cavity.The Josephson junction undergoes a topological transition when the magnetic flux through the cavity passes through half-integer multiples of magnetic flux quantum.For the trivial phase,the CMEMs transmit along the QAHI-TSC interface as without magnetic flux.However,for the nontrivial phase,a zero-energy Majorana state appears in the cavity,leading to that a CMEM can resonantly tunnel through the Majorana state to a different CMEM.These findings may provide a feasible scheme to control the transport of CMEMs by using the magnetic flux and the transport pattern can be customized by setting the size of the TSC.