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Electrical Control of Second-Harmonic Generation in a WSe2 Monolayer Transistor
Kyle L. Seyler, John R. Schaibley, Pu Gong +7
Nonlinear optical frequency conversion, in which optical fields interact with a nonlinear medium to produce new field frequencies, is ubiquitous in modern photonic systems. However…
Population pulsation resonances of excitons in monolayer MoSe2 with sub 1 μeV linewidth
John R. Schaibley, Todd Karin, Hongyi Yu +9
Monolayer transition metal dichalcogenides, a new class of atomically thin semiconductors, possess optically coupled 2D valley excitons. The nature of exciton relaxation in these s…
Highly Anisotropic and Robust Excitons in Monolayer Black Phosphorus
Xiaomu Wang, Aaron M. Jones, Kyle L. Seyler +7
Semi-metallic graphene and semiconducting monolayer transition metal dichalcogenides (TMDCs) are the two-dimensional (2D) materials most intensively studied in recent years. Recent…
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…
Electrically Tunable Excitonic Light Emitting Diodes based on Monolayer WSe2 p-n Junctions
Jason S. Ross, Philip Klement, Aaron M. Jones +9
Light-emitting diodes are of importance for lighting, displays, optical interconnects, logic and sensors. Hence the development of new systems that allow improvements in their effi…
Spin-Layer Locking Effects in Optical Orientation of Exciton Spin in Bilayer WSe2
Aaron M. Jones, Hongyi Yu, Jason S. Ross +6
Coupling degrees of freedom of distinct nature plays a critical role in numerous physical phenomena. The recent emergence of layered materials provides a laboratory for studying th…
Control of Two-Dimensional Excitonic Light Emission via Photonic Crystal
Sanfeng Wu, Sonia Buckley, Aaron M. Jones +9
Monolayers of transition metal dichalcogenides (TMDCs) have emerged as new optoelectronic materials in the two dimensional (2D) limit, exhibiting rich spin-valley interplays, tunab…
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…
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…
Quantum-Enhanced Tunable Second-Order Optical Nonlinearity in Bilayer Graphene
Sanfeng Wu, Li Mao, Aaron M. Jones +3
Second order optical nonlinear processes involve the coherent mixing of two electromagnetic waves to generate a new optical frequency, which plays a central role in a variety of ap…
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…