Moiré superlattices: a new Hubbard model simulator

Monday, November 23, 2020 - 2:30pm

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 realization 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 semiconductors. 

Join Zoom Meeting
https://berkeley.zoom.us/j/3680547136?pwd=LzdPSW1qY2xJd1VyWmFZSU50SW8rZz09 (The password is UCB)

Location: 
virtual (zoom)
Speaker: 
Affiliation: 
Cornell University