Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session M12: Optics in 2D Materials: Part IV
8:00 AM–10:48 AM,
Wednesday, March 6, 2024
Room: M100C
Sponsoring
Unit:
FIAP
Chair: Ding Zhang, Rice University
Abstract: M12.00010 : Second Harmonic Generation and Exciton Binding Energies in ultrathin Copper Iodide
9:48 AM–10:00 AM
Presenter:
Chris Klenke
(University of Arkansas)
Authors:
Chris Klenke
(University of Arkansas)
Sudeep Puri
(University of Arkansas)
Hiroyuki Nakamura
(University of Arkansas)
dimensional (2D) limit. Copper Iodide (CuI) is a material that supports excitons with large
binding energies in bulk (≈60 meV) and likely also at atomic thicknesses. In this work, we grew
ultrathin layers of γ-phase CuI with heights ranging from 1-20 nm and then studied the second-
harmonic generation (SHG) and two-photon photoluminescence signals by using a femtosecond
laser with wavelengths ranging from 770-850 nm. We saw a consistent two-photon excitonic
emission peak of 406nm (3.05 eV) and an increasing SHG efficiency as the laser wavelength
approached the excitonic resonance.
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