【直播】【睿涉者·前沿科学论坛-大师讲】中科院物理所高鸿钧院士:大面积、有序和可调控马约拉纳格点阵列的实现
活动名称:
大面积、有序和可调控马约拉纳格点阵列的实现
活动时间:
2022年8月10日(周三)19:00
报告嘉宾:
高鸿钧 院士(中国科学院物理研究所)
主办单位:
蔻享学术
直播通道
蔻享学术直播间 |
报告人介绍
高鸿钧 院士
中国科学院物理研究所
报告简介
Majorana zero-modes (MZMs) are spatially-localized zero-energy fractional quasiparticles with non-Abelian braiding statistics. They are believed to hold great promise for topological quantum computing. By using low-temperature and strong-magnetic-field scanning tunneling microscopy/spectroscopy, a breakthrough of Majorana zero mode has been achieved in a single material platform of high-Tc iron-based superconductor, FeTe0.55Se0.45,. This material combines the advantages of a simple material, high-Tc, and large ratio of Δ/EF. The mechanism of two distinct classes of vortices presented in this system was revealed, which directly tied with the presence or absence of zero-bias peak. We further found the Majorana conductance plateau in vortices on the iron-based superconductor FeTe0.55Se0.45. Both the extrinsic instrumental convoluted broadening and the intrinsic quasiparticle poisoning can reduce the conductance plateau value, and when extrinsic instrumental broadening is removed by deconvolution, the plateau is found to nearly reach a 2e²/h quantized value. Moreover, we confirmed the existence of MZMs in the vortex cores of CaKFe4As4 and LiFeAs, single-material superconductors belonging to the iron pnictide family. Most recently, we have successfully achieved the large-scale, highly-ordered and tunable MZM lattice in strained LiFeAs. These results show the great potential of the single-material platforms for Majorana research and application in the future.
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