Physics Colloquium: 2D Moiré Superlattices: A New Hubbard Model Simulator
Thursday, November 7, 2019
3:30 PM-4:30 PM
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
Professor Jorn Verderbos
jwv34@drexel.edu
Location
Disque Hall, Room 919, 32 South 32nd Street, Philadelphia, PA 19104
Audience
- Undergraduate Students
- Graduate Students
- Faculty