Room-temperature excitonic absorption in quantum wires

TL;DR

This paper reports the observation of strong, narrow excitonic absorption peaks at room temperature in T-shaped quantum wires, demonstrating significant potential for optoelectronic applications.

Contribution

It presents the first measurement of room-temperature excitonic absorption in quantum wires using waveguide-transmission spectroscopy, highlighting the strong polarization anisotropy and high absorption coefficients.

Findings

Strong and narrow excitonic absorption peak observed at room temperature

Peak modal absorption coefficient of 160 cm$^{-1}$ per 20 wires

Width of the absorption peak is 7.2 meV

Abstract

We measured absorption spectra of T-shaped quantum wires at room temperature using waveguide-transmission spectroscopy. Strong and narrow room-temperature one-dimensional-exciton absorption peak was observed, which shows peak modal absorption coefficient of 160 cm$^{-1}$ per 20 wires with $\Gamma$-factor of $4.3\times10^{-3}$, width of 7.2 meV, and strong polarization anisotropy.