Graduate Program Events |
Events During the Week of April 16th through April 23rd, 2023
Monday, April 17th, 2023
- No events scheduled
Tuesday, April 18th, 2023
- No events scheduled
Wednesday, April 19th, 2023
- No events scheduled
Thursday, April 20th, 2023
- Deadline for Graduate students to request pass/fail or credit/audit options for a Spring term course
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Deadline for Graduate students to change variable credits
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Disorder in the Kitaev Spin Liquid
- Time: 4:00 pm - 5:00 pm
- Place: 5310 Chamberlin
- Speaker: Wen-Han Kao, PhD graduate student in Physics at Univ of Minnesota
- Abstract: One of the long-standing open questions that recently attracted much attention is understanding how a quantum spin liquid (QSL) state responds to various forms of structural disorder that are inevitable in real materials. In the candidate compounds of the Kitaev spin liquid (KSL) system, it has been noted that quenched disorder plays a role in suppressing the long-range magnetic order but also makes the low-energy excitations puzzling. In my talk, I will introduce how the presence of vacancies and bond randomness modifies the density of states of Majorana fermion, which is one kind of fractionalized excitation of KSL. In the site-diluted model, the pileup of low-energy states leads to divergent specific heat, and the flux-sector crossover under magnetic fields provides an explanation for the puzzling experimental findings of a strong candidate material H3LiIr2O6. We also explored how the fractionalized degrees of freedom renormalize in the strong-disorder limit of bond randomness. Namely, we applied the strong-disorder renormalization group (SDRG) on the KSL system and found that strong-disorder criticality can appear differently on distinct fractionalized excitations. This points out further inquiries about the quenched disorder effects in frustrated magnetism.
- Host: Jaglul Hasan/Alex Levchenko
Friday, April 21st, 2023
- Deadline for students to drop a Spring term course
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Deadline for students to change Honors Optional course status
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Deadline for students to add a Spring term course with department permission
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Deadline for students (except Graduate) to withdraw from Spring term
- Abstract: *Note: actual end time may vary.* CONTACT: 262-3811, registrar@em.wisc.edu URL:
- Graduate School Spring 2023: Request for all master's and doctoral degree warrants
- Time: 4:00 pm - 5:00 pm
- Abstract: CONTACT: 262-2433, gsacserv@grad.wisc.edu