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10 papers
Many-body effects in nonlinear optical responses of 2D layered semiconductors
Grant Aivazian, Hongyi Yu, Sanfeng Wu +5
We performed ultrafast degenerate pump-probe spectroscopy on monolayer WSe2 near its exciton resonance. The observed differential reflectance signals exhibit signatures of strong m…
Multiple Hot-Carrier Collection in Photo-Excited Graphene Moire Superlattices
Sanfeng Wu, Lei Wang, You Lai +10
In conventional light harvesting devices, the absorption of a single photon only excites one electron, which sets the standard limit of power-conversion efficiency, such as the Sho…
Photo-Nernst current in graphene
Helin Cao, Grant Aivazian, Zaiyao Fei +3
Photocurrent measurements provide a powerful means of studying the spatially resolved optoelectronic and electrical properties of a material or device. Generally speaking there are…
Magnetic Control of Valley Pseudospin in Monolayer WSe2
Grant Aivazian, Zhirui Gong, Aaron M Jones +7
Local energy extrema of the bands in momentum space, or valleys, can endow electrons in solids with pseudo-spin in addition to real spin. In transition metal dichalcogenides this v…
Observation of Long-Lived Interlayer Excitons in Monolayer MoSe2-WSe2 Heterostructures
Pasqual Rivera, John R. Schaibley, Aaron M. Jones +9
Two-dimensional (2D) materials, such as graphene1, boron nitride2, and transition metal dichalcogenides (TMDs)3-5, have sparked wide interest in both device physics and technologic…
Optical Generation of Excitonic Valley Coherence in Monolayer WSe2
Aaron Mitchell Jones, Hongyi Yu, Nirmal Ghimire +9
Due to degeneracies arising from crystal symmetries, it is possible for electron states at band edges ("valleys") to have additional spin-like quantum numbers. An important questio…
Vapor-Solid Growth of High Optical Quality MoS2 Monolayers With Near-Unity Valley Polarization
Sanfeng Wu, Chunming Huang, Grant Aivazian +3
Monolayers of transition metal dichalcogenides (TMDCs) are atomically thin direct-gap semiconductors with potential applications in nanoelectronics, optoelectronics, and electroche…
Electrical Control of Two-Dimensional Neutral and Charged Excitons in a Monolayer Semiconductor
Jason S Ross, Sanfeng Wu, Hongyi Yu +8
Monolayer group VI transition metal dichalcogenides have recently emerged as semiconducting alternatives to graphene in which the true two-dimensionality (2D) is expected to illumi…
Electrical Tuning of Valley Magnetic Moment via Symmetry Control
Sanfeng Wu, Jason S Ross, Grant Aivazian +8
Crystal symmetry governs the nature of electronic Bloch states. For example, in the presence of time reversal symmetry, the orbital magnetic moment and Berry curvature of the Bloch…
New Aspects of Photocurrent Generation at Graphene pn Junctions Revealed by Ultrafast Optical Measurements
Dong Sun, Grant Aivazian, Aaron M. Jones +3
The unusual electrical and optical properties of graphene make it a promising candidate for optoelectronic applications. An important, but as yet unexplored aspect is the role of p…