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Carrier Plasmon Induced Nonlinear Band Gap Renormalization in Two-Dimensional Semiconductors
Yufeng Liang, Li Yang
In reduced-dimensional semiconductors, doping-induced carrier plasmons can strongly couple with quasiparticle excitations, leading to a significant band gap renormalization. We dev…
Tunable Band Gap and Anisotropic Optical Response in Few-layer Black Phosphorus
Vy Tran, Ryan Soklaski, Yufeng Liang +1
We report the quasiparticle band gap, excitons, and highly anisotropic optical responses of few-layer black phosphorous (phosphorene). It is shown that these new materials exhibit…
New Mechanism for Strongly Bound Excitons in Gapless Two-Dimensional Structures
Yufeng Liang, Ryan Soklaski, Shouting Huang +4
Common wisdom asserts that bound excitons cannot form in high-dimensional (d>1) metallic structures because of their overwhelming screening and unavoidable resonance with nearby co…
Temperature Renormalization of Optical Spectra of Monolayer MoS2
Ryan Soklaski, Yufeng Liang, Changjian Zhang +3
Newly measured optical absorption and photoluminescence spectra reveal substantial frequency shifts of both exciton and trion peaks as monolayer MoS2 is cooled from 363 K to 4 K. F…