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PHYSICS PHD DISSERTATION DEFENSE: Edwin Huang

Ph.D. Candidate:  Edwin Huang

Research Advisor:  Thomas Devereaux

Date: Tuesday, July 23, 2019
Time: 11:30am
Location: McCullough 335

Title: Intertwined orders and their dynamical properties in strongly correlated systems

Abstract:

Strongly correlated matter is characterized by a qualitative departure from the properties of non-interacting electrons. While this departure leads to extraordinary phenomena in complex phase diagrams, it simultaneously diminishes theoretical control. Without analytical approaches to solving even toy models of such systems, questions regarding intertwined orders, normal state fluctuations, and dynamical response functions are extremely subtle and sensitive to approximations. An alternative and complementary approach is to use controlled numerical simulations. I will present quantum Monte Carlo calculations, one such method of controlled numerics, of the Hubbard model, which represents a minimal toy model for correlated electrons. Despite the presence of a severe fermion sign problem, these calculations are still feasible down to temperatures an order of magnitude below the Fermi energy, by utilizing modern computational power. I will discuss insights obtained by these simulations for two topics: (i) stripe order in the doped Hubbard model, which closely parallels behavior in cuprate superconductors and other transition metal oxides, and (ii) normal state signatures of strange metallic transport and pseudogap effects.

July 23, 2019 - 11:30am
McCullough 335