72 citations · 316 across the 13 of their papers we have counts for
10 papers · 1 filter
Layer- and Frequency-Dependent Second Harmonic Generation in Reflection from GaSe Atomic Crystals
Yanhao Tang, Krishna C. Mandal, John A. McGuire +1
We report optical second-harmonic generation (SHG) in reflection from GaSe crystals of 1 to more than 100 layers using a fundamental picosecond pulsed pump at 1.58 eV and a superco…
Optical Spin Polarization Dynamics in GaSe Nanoslabs
Yanhao Tang, Wei Xie, Krishna C. Mandal +2
We report nearly complete preservation of "spin memory" between optical absorption and photoluminescence (PL) in nanometer slabs of GaSe pumped with up to 0.2 eV excess energy. At…
Exciton spin dynamics in GaSe
Yanhao Tang, Wei Xie, Krishna C. Mandal +2
We analyze exciton spin dynamics in GaSe under nonresonant circularly polarized optical pumping with an exciton spin-flip rate-equation model. The model reproduces polarized time-d…
Spin splitting in 2D monochalcogenide semiconductors
Dat T. Do, Subhendra D. Mahanti, Chih Wei Lai
We report ab initio calculations of the spin splitting of the uppermost valence band (UVB) and the lowermost conduction band (LCB) in bulk and atomically thin GaS, GaSe, GaTe, and…
Linearly polarized remote-edge luminescence in GaSe nanoslabs
Yanhao Tang, Wei Xie, Krishna C. Mandal +2
We report highly linearly polarized remote luminescence that emerges at the cleaved edges of nanoscale gallium selenide slabs tens of micrometers away from the optical excitation s…
Multiple-pulse lasing from an optically induced harmonic confinement in a highly photoexcited microcavity
Wei Xie, Feng-Kuo Hsu, Yi-Shan Lee +2
We report the observation of macroscopic harmonic states in an optically induced confinement in a highly photoexcited semiconductor microcavity at room temperature. The spatially p…
Spin-polarized lasing in a highly photoexcited semiconductor microcavity
Feng-kuo Hsu, Wei Xie, Yi-Shan Lee +2
We demonstrate room-temperature spin-polarized ultrafast (10 ps) lasing in a highly optically excited GaAs microcavity. This microcavity is embedded with InGaAs multiple quan…
A Room-temperature Spin-polarized Polariton Laser
Feng-kuo Hsu, Yi-Shan Lee, Sheng-Di Lin +1
In the field of spin-controlled semiconductor lasers, massive effort has been focused upon materials with long spin relaxation times (~ns). In contrast, we demonstrate room-tempera…
Signature of the microcavity exciton-polariton relaxation mechanism in the polarization of emitted light
Georgios Roumpos, Chih-Wei Lai, T. C. H. Liew +3
We have performed real and momentum space spin-dependent spectroscopy of spontaneously formed exciton polariton condensates for a non-resonant pumping scheme. Under linearly polari…
GaAs Microcavity Exciton-Polaritons in a Trap
Na Young Kim, Chih-Wei Lai, Shoko Utsunomiya +8
We present a simple method to create an in-plane lateral potential in a semiconductor microcavity using a metal thin-film. Two types of potential are produced: a circular aperture…