[Physics-grads-open] special condensed matter seminar on Wednesday Mar 15th

[Jennifer E Reising]

[cid:image001.png at 01D95591.5CFBE050]


Special Condensed Matter Seminar
Unconventional Flux Quantization of Topological Superconductors
Yufan Li
Department of Physics, the Chinese University of Hong Kong
Abstract: The most distinctive feature of superconductivity is the presence of the complex-valued many-particle wave function that sustains phase coherence over macroscopic distances. One of its experimental manifestations is the flux quantization in a superconducting ring. The single-value nature of the wave function dictates a universal phase change of 2[cid:image002.png at 01D95591.5CFBE050] for any closed path around the ring. As a result, the fluxoid can only take on quantized values in integer steps of [cid:image003.png at 01D95591.5CFBE050] , where h is the Planck constant and the denominator of [cid:image004.png at 01D95591.5CFBE050]  is the signature of electron pairing. There are two hallmarks of the well established integer flux quantization: the quantization is [cid:image005.png at 01D95591.5CFBE050]  periodic, and energy minima are achieved at [cid:image006.png at 01D95591.5CFBE050]  = n [cid:image005.png at 01D95591.5CFBE050] . Our experiments in topological superconductors found that both hallmarks of flux quantization may be violated. For topological superconductors, the spin-triplet pairing state may give rise to half-integer flux quantization [cid:image007.png at 01D95591.5CFBE050]  = (n+½) [cid:image005.png at 01D95591.5CFBE050] , due to the odd parity of the superconducting gap function, or [cid:image008.png at 01D95591.5CFBE050] . The half-quantum flux has been observed in polycrystalline rings of superconducting [cid:image009.png at 01D95591.5CFBE050] -Bi2Pd [1] and α-BiPd [2]. Moreover, we have observed multiple quantization periodicities of of [cid:image010.png at 01D95591.5CFBE050] , [cid:image011.png at 01D95591.5CFBE050]  and [cid:image012.png at 01D95591.5CFBE050] , in addition to the conventional [cid:image005.png at 01D95591.5CFBE050] , in mesoscopic rings of epitaxial [cid:image009.png at 01D95591.5CFBE050] -Bi2Pd [3], which may reflect its topological properties. The highly unconventional flux quantization are distinctive experimental features for topological superconductors.


Wednesday, March 15, 2023

2:30 p.m. in the Physics Building (Reading Room 3035)


Kind regards,

Jennifer Reising
Financial Services Supervisor
UC Riverside | Physics & Astronomy
3047 Physics Building | Riverside, California 92521
Office: 951.827.5033 | jreising at ucr.edu<mailto:jreising at ucr.edu>
In-person office hours:  Monday, Wednesday & Thursday from 8:00 am - 5:00 pm
Virtual office hours:  Tuesday & Friday from 8:00 am - 5:00 pm
[cid:image013.png at 01D95591.5CFBE050]





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