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Physics Colloquium: 2D Moiré Superlattices: A New Hubbard Model Simulator
Start Date: 11/7/2019Start Time: 3:30 PM
End Date: 11/7/2019End Time: 4:30 PM

Event Description

Kin Fai Mak, PhD, Cornell University


The Hubbard model, first formulated by physicist John Hubbard in the 1960s, is a simple theoretical model of interacting quantum particles in a lattice. The model is thought to capture the essential physics of high-temperature superconductors, magnetic insulators, and other complex emergent quantum many-body ground states. Although the Hubbard model is greatly simplified as a representation of most real materials, it has nevertheless proved difficult to solve accurately except in the one-dimensional case. Physical realizations of the Hubbard model in two or three dimensions, which can act as quantum simulators, therefore have a vital role to play in solving the strong-correlation puzzle. In this talk, I will discuss a recent experimental realization of the two-dimensional triangular lattice Hubbard model in angle-aligned WSe2/WS2 bilayers, which form moiré superlattices because of the difference in lattice constant between the two 2D materials. We obtain a quantum phase diagram of the two-dimensional triangular lattice Hubbard model near the half filling by probing both the charge and magnetic order of the system. Implications for future studies will also be discussed.

Contact Information:
Name: Professor Jorn Verderbos
Email: jwv34@drexel.edu
Disque Hall, Room 919, 32 South 32nd Street, Philadelphia, PA 19104
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