CMSA Condensed Matter/Math Seminar: Spectral Gaps in Quantum Spin Systems


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April 16, 2020 10:30 am - 12:00 pm
via Zoom Video Conferencing

Marius Lemm - Harvard University

via Zoom Video Conferencing:

Quantum spin systems are many-body models which are of wide interest in modern physics and at the same time amenable to rigorous mathematical analysis. A central question about a quantum spin system is whether its Hamiltonian exhibits a spectral gap above the ground state. The existence of such a spectral gap has far-reaching consequences, e.g., for the ground state complexity. In this talk, we survey recent progress regarding spectral gaps for frustration-free quantum spin systems in dimensions greater than 1 such as the antiferromagnetic models of Affleck-Kennedy-Lieb-Tasaki (AKLT).