Details
Speaker Name/Affiliation
John Schaibley / University of Arizona
When
-
Seminar Type
Seminar Type Other
Center for Experiments on Quantum Materials (CEQM) Seminar
Location (Room)
Duane Physics Room G126
Event Details & Abstracts
Abstract:
Two dimensional (2D) semiconductors, such as MoSe2 and WSe2, host tightly bound excitons (electron-hole pairs) that interact strongly with light. These monolayer semiconductors can be stacked together to realize heterostructures that exhibit new excitonic effects. In this presentation, I will discuss the optical response of two different 2D semiconductor heterostructures. First, I will review the progress towards understanding interlayer excitons in MoSe2-WSe2 heterobilayers. These interlayer excitons host a rich moiré physics associated with the spatially modulated interactions between layers. I will discuss our recent discoveries related to the origin of spectrally narrow photoluminescence from single photon emitters in these heterostructures. Interlayer excitons also possess a large permanent dipole moment that allows for their energy to be tuned with an out-of-plane electric field. By nano-patterning a gate on top of the MoSe2-WSe2 heterostructure, we are able to realize quantum dot-like potentials, which have potential applications toward realizing deterministic single photon emitters. Using the same architecture, we have demonstrated high speed interlayer exciton currents based on “slide” like quasi-one dimensional channels which have applications to excitonic circuitry.
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The schedule of the upcoming seminars can be found here
https://physicscourses.colorado.edu/seminars/cmpseminar/Fall%202022/index.html
All seminars are on Thursdays at 12pm, in person G126 or online zoom link https://cuboulder.zoom.us/j/97321368919, password required, unless otherwise noted.
To receive email announcements for these seminars, or for other questions, please contact Victor Gurarie, victor.gurarie@colorado.edu