Valley and nonlinear optics

WU Shi-Wei

doi:10.7693/wl20160804

PHYSICS > 2016 > 45(8): 510-515. > DOI: 10.7693/wl20160804

WU Shi-Wei. Valley and nonlinear optics[J]. PHYSICS, 2016, 45(8): 510-515. DOI: 10.7693/wl20160804

Citation:

WU Shi-Wei. Valley and nonlinear optics[J]. PHYSICS, 2016, 45(8): 510-515. DOI: 10.7693/wl20160804

Citation:

WU Shi-Wei. Valley and nonlinear optics[J]. PHYSICS, 2016, 45(8): 510-515. DOI: 10.7693/wl20160804

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Valley and nonlinear optics

WU Shi-Wei^1,2,†

(1 State Key Laboratory of Surface Physics,Key Laboratory of Micro and Nano Photonic Structures(MOE),and Department of Physics,Fudan University,Shanghai 200433,China)
(2 Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China)

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Received Date: June 20, 2016
Published Date: August 11, 2016

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Abstract

With the emergence of atomically thin two-dimensional quantum materials in recent years, the valley degree of freedom has become a new research focus. Meanwhile, nonlinear optics is an important and indispensable branch in modern optics. These two seemingly unrelated topics are now intimately correlated by the fact that both are sensitive to the broken inversion symmetry of various materials. In this paper I will introduce the relationship between the valley degree of freedom and the most basic nonlinear optical process, namely second harmonic generation, by focusing on the monolayer and few layers of transition metal dichalcogenides. It will be shown that nonlinear optics is a powerful technique to study valley physics. In turn, valley hosting materials such as transition metal dichalcogenides enrich the subject of nonlinear optics. It is anticipated that two-dimensional materials and devices will emerge as a new frontier of nonlinear optics.

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