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Chiral supercurrent in quantum Hall Josephson junctions

Date: 2024-10-23
Time: 16:00
Venue: X1 101
Speaker: Prof. Benjamin Sacépé

奈尔研究所QUEST实验室

报告摘要:

Hybridizing superconductivity with the quantum Hall effects has major potential for designing novel circuits capable of inducing and manipulating non-Abelian states. In this talk I will present our recent results on quantum Hall Josephson junctions based on graphene nanoribbons. I will show that with suitably designed junctions, a robust supercurrent can develop on the quantum Hall plateau of normal state resistance h/2e2 and withstand up to 8 teslas. The particular feature of those junctions is a chiral supercurrent with an unusual 2Φ0=h/e flux periodicity, indicating that the Andreev bound states propagate in a chiral fashion via the quantum Hall edge channels and form a loop along the sample periphery. The key parameters that limit the supercurrent in the quantum Hall regime and their consequences for more exotic quantum Hall states will also be discussed.

报告人简介:

Benjamin SACEPE教授在法国Orsay大学获得凝聚态物理硕士学位,后在法国格勒诺布尔原子能研究中心从事mK温度下超导无序薄膜的超导-绝缘体量子相变STM研究,并于2007年获得博士学位,导师为Calude Chapelier教授。2008-2010年SACEPE教授先后在以色列Weizmann研究所和日内瓦大学从事博士后研究。2011年在奈尔研究所获得教职,主要在介观物理、量子霍尔边界态的超导注入、拓扑超导、无序超导态等基础研究领域开展探索。Benjamin SACEPE教授两次获得欧盟研究机构(ERC)的项目资助,目前为奈尔研究所QUEST实验室负责人。2022-2023年在圣芭芭拉谷歌量子AI中心担任访问教授。近两年来,Benjamin SACEPE教授在手性超导边界态和超导量子霍尔干涉器件方面取得了开创性的研究成果。相关工作在Science、Nautre、Nature Physics等杂志发表。

邀 请 人:沈 洁  特聘研究员

      于国强  研究员

联 系 人:王慧颖 why@iphy.ac.cn

腾讯会议:926-333-606

会议密码:2024

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