Rydberg excitons in Cu2O can be an emergent platform for solid-state quantum information processing by utilizing the exaggerated properties of high-lying excited states within the material. To develop practical quantum systems, high-temperature operation is desirable. Here, we study the temperature-dependence of the yellow and green Rydberg exciton resonances in a thin Cu2O crystal via broad-band phonon-assisted absorption spectra between 4 K and 100 K. At 4 K, we can identify the principal quantum number n = 11 yellow and n = 4 green Rydberg exciton states, beyond which we are limited by the spectral resolution of standard absorption techniques. Above liquid nitrogen boiling temperature (~80 K), the n = 6 yellow and n = 4 green Rydberg exciton states are readily captured and higher-temperature yellow Rydberg exciton optical properties still exhibit the standard scaling laws seen at low temperatures. This promising result lays the groundwork for a new route to build a high-temperature Rydberg quantum information processing architecture with solid-state Cu2O.
@article{arxiv.2105.00326,
title = {Temperature Study of Rydberg Exciton Optical Properties in Cu2O},
author = {Dungeon Daniel Kang and Aaron Gross and HeeBong Yang and Yusuke Morita and Kyung Soo Choi and Kosuke Yoshioka and Na Young Kim},
journal= {arXiv preprint arXiv:2105.00326},
year = {2021}
}