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澳门新葡亰集团官网“博约学术论坛”系列报告(第261期)

发布日期:2020年10月23日

题目:超导体和自旋电子学中的手征相互作用

报告人:于涛 博士后 (德国马克斯普朗克物质结构与动力学研究所)

时  间:2020年10月24日(周六)下午 15:00-17:00

地  点:在线报告 (腾讯会议号:455 232 357,会议密码:1024)

摘要:

Chirality is an independent degree of freedom, similar to spin, valley and other quantum degree of freedoms. In this talk, I will address two applications of chirality in superconducting quantum computing and spintronics. Chiral topological superconductors host chiral Cooper pairs and support Majorana modes at the edge. We show the induced interaction between two kinds of chiral Copper pairs by a laser field in chiral superconductors can switch the chirality of Cooper pairs and optically write the Majorana modes, which is promising in the future quantum computing based on the candidates including twisted bilayer graphene and heavy fermion system [1]. For the spintronics, we universally demonstrate the dynamical chiral coupling---the confined quasiparticle can only interact with the traveling quasiparticles that propagate in one direction---among magnon, photon, phonon, and electron [2-5], which is widely confirmed by the experiments. The novel chiral dynamics adds functionality to downscaled spintronics devices, such as non-contact spin pumping, unidirectional spin transport, chiral Seebeck effect, magnonic non-Hermitian skin effect, spin blockage/trap with perfect energy/spin transfer between two magnets, nonreciprocal level attraction, and phonon/magnon/microwave photon/electron spin diode effects, to name a few.

 

[1] T. Yu, M. Claassen, D. M. Kennes, and M. A. Sentef, “Optical Manipulation of Domains in Chiral Topological Superconductors”, arXiv:2010.00838.

[2] X. Zhang, G. E. W. Bauer, and T. Yu*, “Unidirectional Pumping of Phonons by Magnetization Dynamics”, Phys. Rev. Lett 125, 077203 (2020).

[3] T. Yu and G. E. W. Bauer, “Noncontact Spin Pumping by Microwave Evanescent Fields”(Editors’Suggestion), Phys. Rev. Lett 124, 236801 (2020).

[4] T. Yu, Y.-X. Zhang, S. Sharma, X. Zhang, Y. M. Blanter, and G. E. W. Bauer,“Magnon Accumulation in Chirally Coupled Magnets”, Phys. Rev. Lett. 124, 107202 (2020).

[5] T. Yu, Y. M. Blanter, and G. E. W. Bauer, “Chiral pumping of spin waves”, Phys. Rev. Lett. 123, 247202 (2019).

简历:

  于涛,2018年于中国科学技术大学获得凝聚态物理专业博士学位,之后在荷兰代尔夫特理工大学,日本东北大学和德国马克斯普朗克物质结构与动力学研究所从事博士后研究工作。研究专注于超导,磁性,半导体和冷原子等关联材料的超快动力学,非平庸物态和拓扑性质。

联系方式:ccliu@bit.edu.cn

邀请人: 刘铖铖

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