学术报告 Braiding Majorana zero modes in spin space: from worldline to worldribbon
【报告题目】 Braiding Majorana zero modes in spin space: from worldline to worldribbon
【报 告 人】 刘鑫 教授
【时 间】 2018-06-20 星期三 16:00
【地 点】 理工楼801
Quantum states in solids inevitably have internal degrees of freedom of spin, including Majorana zero modes (MZMs).In this talk, I will first give an introduction of MZMs and their unique spin properties. A summary of the proposals for detecting and braiding MZMs and their spin counterparts will be present. I then focus on our recent work, proposing a scheme to braid MZMs by locally winding the Majorana spins, which topologically corresponds to twisting two associated worldribbons, equivalent to worldlines that track the braiding history of MZMs. We demonstrate the feasibility of applying the current scheme to the superconductor/2D-topological-insulator/ferromagnetic-insulator (SC/2DTI/FI) hybrid system. The braiding operation by winding Majorana spins is robust against local imperfections such as irregular winding paths, the static and dynamical disorder effects, which is a natural consequence of the intrinsic connection of our scheme to topological charge pumping.
Prof. Xin Liu got his B.S. degree in Nankai University and M.S. degree in Chern Institute of Mathematics, Tianjin. He received his Ph. D. from Texas A&M University in 2012. After graduation, he had worked as a postdoctoral researcher in the Pennsylvania State University from 2012 to 2014 and Condensed Matter Theory Center, University of Maryland from 2014-2015. He joined Huazhong University of Science and Technology in 2015.
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