Quantum Phases and Phase Transitions in Multilayered Dipolar Excitons

QUEST Center event
No
Speaker
Snir Gazit, Hebrew University
Date
04/01/2024 - 13:30 - 12:30Add to Calendar 2024-01-04 12:30:00 2024-01-04 13:30:00 Quantum Phases and Phase Transitions in Multilayered Dipolar Excitons   Dipolar excitons in semiconductors and transition metal dichalcogenide (TMD) heterostructures have recently emerged as a promising experimental platform for realizing strongly correlated quantum many-body phenomena. In my talk, I will discuss multilayered structures that expose the anisotropic nature of dipolar interactions. Specifically, I will present a trilayer system that allows stabilizing a quantum quadrupolar state via tunneling events of holes between outer layers, as was recently observed experimentally. With increased exciton density, dipolar interactions destabilize the quadrupolar state and nucleate a staggered dipolar phase with broken layer symmetry. Furthermore, I will show that quadrilayer structures can support an interlayer molecular ("pair") superfluid phase and argue that it can be experimentally detected via a jump discontinuity in the exciton spectral shifts. Lastly, tuning exciton densities drives a quantum phase transition belonging to the (2+1)D XY universality class, marked by breaking interlayer molecules and softening of the associated binding energy. If time permits, I'll present recent unpublished results indicating a trimer condensate in antiparallel dipolar bilayers. Conference room on the 0th floor of Resnick building Department of Physics physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Conference room on the 0th floor of Resnick building
Abstract

 

Dipolar excitons in semiconductors and transition metal dichalcogenide (TMD) heterostructures have recently emerged as a promising experimental platform for realizing strongly correlated quantum many-body phenomena. In my talk, I will discuss multilayered structures that expose the anisotropic nature of dipolar interactions. Specifically, I will present a trilayer system that allows stabilizing a quantum quadrupolar state via tunneling events of holes between outer layers, as was recently observed experimentally. With increased exciton density, dipolar interactions destabilize the quadrupolar state and nucleate a staggered dipolar phase with broken layer symmetry. Furthermore, I will show that quadrilayer structures can support an interlayer molecular ("pair") superfluid phase and argue that it can be experimentally detected via a jump discontinuity in the exciton spectral shifts. Lastly, tuning exciton densities drives a quantum phase transition belonging to the (2+1)D XY universality class, marked by breaking interlayer molecules and softening of the associated binding energy. If time permits, I'll present recent unpublished results indicating a trimer condensate in antiparallel dipolar bilayers.

Last Updated Date : 31/12/2023