72 citations · 316 across the 13 of their papers we have counts for
13 papers
Optical switching of defect charge states in 4H-SiC
D. Andrew Golter, Chih Wei Lai
We demonstrate optically induced switching between bright and dark charged divacancy defects in 4H-SiC. Photoluminescence excitation and time-resolved photoluminescence measurement…
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…
Transient dual-energy lasing in a semiconductor microcavity
Feng-Kuo Hsu, Wei Xie, Yi-Shan Lee +2
We demonstrate sequential lasing at two well-separated energies in a highly photoexcited planar microcavity at room temperature. Two spatially overlapped lasing states with distinc…