Exploring High-Temperature Exciton BEC in Two-Dimensional Heterostructures
Abstract
This project aims to explore high-temperature exciton Bose-Einstein condensates (BECs) and quantum exciton devices in transition metal dichalcogenide (TMDC) heterostructure, where novel optical spectroscopy will be used to directly measure the dynamic transport of interlayer excitons. Bose-Einstein condensates (BECs) are macroscopic quantum states exhibiting superfluid transport. Excitons, composite bosons consisting of bound pairs of electrons and holes, are predicted to host BEC at orders of magnitude higher critical temperatures than that in cold atom systems due to the much smaller exciton mass with atoms. We will use TMDC heterostructures composed of MoSe2 and WSe2 monolayers separated by a thin hBN as the model system to explore interlayer exciton BEC in 2D materials. Because the electrons and holes are localized in separate layers, interlayer excitons exhibit extended lifetimes and electrical tunability due to their permanent electric dipole moments. By adding insulating hexagonal boron nitride (hBN) layers between the active TMDC layers, we can further suppress the tunneling and recombination rates for the electrons and holes and create nearly equilibrium-state interlayer excitons. Such interlayer excitons can have an exciton binding energy of tens of meV and can host exciton BEC at up to 100K.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 29, 2024
- Source ID
- FA95502310246
Entities
People
- Feng Wang
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of California Regents