- back to listing
Past Events
Interaction physics in doped quantum paraelectric
| Speaker: | Prof. Sukbum CHUNG |
| Affiliation: | University of Seoul |
| Date: | November 14, 2023 (Tuesday) |
| Time: | 4:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, The University of Hong Kong |
Abstract
Recent experiments on Nb-doped SrTiO3 have shown that the superconducting energy gap to the transition temperature ratio maintains the Bardeen–Cooper–Schrieffer (BCS) value throughout its superconducting dome [2]. Motivated by these and related studies, I will show that the Cooper pairing mediated by a single soft transverse-optical phonon is the most natural mechanism for such a superconducting dome given experimental constraints, and present the microscopic theory for this pairing mechanism [1]. I will then discuss how these phonons can also mediate spin current response to inhomogeneous electric field [3].
References:
[1] Y Yu, H Hwang, S Raghu, and SBC, npj Quantum Materials 7 63 (2022)
[2] H Yoon, H Hwang, Y Yu, S Raghu, SBC et al. arXiv:2106.10802
[3] K M Kim and SBC (under preparation)
Biography
Professor Chung is a theoretical condensed matter physicist with a broad interest in superconductivity, topological phases in condensed matter systems. He graduated from University of Illinois at Urbana-Champaign in 2008, and worked as a postdoctoral fellow at Stanford and UCLA. Currently, he is a professor at the Department of Physics, University of Seoul. He is an expert in the physics of unconventional superconductivity and more recently has been interested in the mechanism of Cooper pairing in doped SrTiO3.
(Joint Seminar of the Department of Physics & HK Institute of Quantum Science & Technology)
Anyone interested is welcome to attend.