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Ph.D. Candidate:  Chao Wang

Research Advisor:  Prof. Steven Kivelson

Date: Tuesday, Nov 2, 2021
Time: 9:30am-12:00pm  PDT

Zoom Link:

Zoom Password: email before 12pm on Nov 1 for password.


Title: Nematic Antiferromagnetism and Deconfined Criticality from Interacting Electrons and Phonons

Abstract: Systems with strong electron-phonon couplings typically exhibit various forms of charge order, while strong electron-electron interactions lead to magnetism. We use determinant quantum Monte Carlo (DQMC) calculations to solve a model on a square lattice with a caricature of these interactions. In the limit where electron-electron interactions dominate it has antiferromagnetic (AF) order, while where electron-phonon coupling dominates there is columnar valence-bond solid (VBS) order. We find a novel intervening phase that hosts coexisting nematic and antiferromagnetic orders. We have also found evidence of a Landau-forbidden continuous quantum phase transition with an emergent O(4) symmetry between the VBS and the nematic antiferromagnetic phases.

November 2, 2021 - 9:30am