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Physics & Astronomy Quantum Nano Seminar - Shankar Ganesh, Yale University

Title: "Monopoles in Dirac spin liquids and their symmetries from instanton calculus"

5/27/2025
2:30 pm – 3:30 pm
Wilder 202 & Zoom
Intended Audience(s): Public
Categories: Arts and Sciences, Lectures & Seminars

Abstract: The Dirac spin liquid is a 2d fractionalized Mott insulator featuring massless Dirac spinon excitations coupled to a compact U(1) gauge field, which allows for flux-tunneling instanton events described by magnetic monopoles. The associated operators, which encode symmetries of conventional ordered phases proximate to the spin liquid, have been constructed using conformal field theory methods. I will instead use semiclassical instanton methods to construct monopole operators and paint them as ’t Hooft vertices — fermion-number-violating interactions that have their origin in instanton-bound zero modes of the Dirac operator. 

Ref: G. Shankar and J. Maciejko, SciPost Phys. 16, 118 (2024)

Hosted by Professor Rufus Boyack

Join Zoom Meeting
https://dartmouth.zoom.us/j/93672234574?pwd=lXV2bhO5mDoPEVrBkFArmIFPbP7aC8.1

Meeting ID: 936 7223 4574
Email Physics.Department@dartmouth.edu for passcode

For more information, contact:
Tressena Manning
tressena.a.manning@dartmouth.edu
603-646-2854
Permanent URL to this event: https://physics.dartmouth.edu/events/event?event=77759

Events are free and open to the public unless otherwise noted.