报告题目：Supersymmetry in Closed Chains of Interacting Majorana Modes

报告人：黄钊 （日本庆应义塾大学 自然科学研究教育中心）

报告时间：2017年9月14日 周四 10：30-11：30

报告地点：新楼二楼阳光房

报告摘要：We consider a closed chain of even number of Majorana zero modes with nearest-neighbour couplings which are different site by site generically, thus no any crystal symmetry. Instead, we demonstrate the possibility of an emergent supersymmetry (SUSY), which is accompanied by gapless Fermionic excitations. In particular, the condition can be easily satisfied by tuning only one coupling, regardless of how many other couplings are there. Such a system can be realized by four Majorana modes on two parallel Majorana nanowires with their ends connected by Josephson junctions and bodies connected by an external superconducting ring. By tuning the Josephson couplings with a magnetic flux Φ through the ring, we get the gapless excitations at Φ_SUSY=±fΦ_0 with Φ_0=hc/2e, which is signaled by a zero-bias conductance peak in tunneling conductance. We find this f generally a fractional number and oscillating with increasing Zeeman fields that parallel to the nanowires, which provide a unique experimental signature for the existence of Majorana modes (arXiv: 1707.04195).

报告人简介：

黄钊，男，湖北人，2016年日本物质材料研究机构&筑波大学获得博士学位，2016年至今在庆应义塾大学做博士后。研究领域为凝聚态理论，包括介观超导体系、多带超导和拓扑超导体系等，目前的主要研究兴趣为拓扑超导中马约拉纳费米子的性质和应用。

邀请人：余睿教授