Unidirectional valley-contrasting photo-current in strained transition metal dichalcogenide monolayers

Abstract

We examine the full static non-linear optical response of uniaxially strained transition metal dichalcogenide monolayers doped with a finite carrier density in the conduction band, in the presence of disorder. We find that the customary shift current is suppressed, yet we identify a strong, valley-dependent non-reciprocal response, which we term a \textit{unidirectional valley-contrasting photo-current} (UVCP). This DC current originates from the combined effect of strain and Kramers symmetry breaking by trigonal warping, while the contributions due to individual valleys can be separated by introducing an energy offset between them by means of a magnetization. This latter fact enables one to monitor inter-valley transitions. The UVCP is proportional to the mobility and is enhanced by the excitonic Coulomb interaction and inter-valley scattering, as well as by a top gate bias. We discuss detection strategies in state-of-the-art experiments.

Main text: 33 pages, 9 figures

References in corpus (21)

• Valley polarization in MoS2 monolayers by optical pumping
• Photovoltaic Hall effect in graphene
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Non-linear Optical Spectroscopy of Excited Exciton States for Efficient Valley Coherence Generation in WSe2 Monolayers
• Non-Reciprocal Brillouin Scattering Induced Transparency
• Anomalous Hall effect in 2D Dirac band: link between Kubo-Streda formula and semiclassical Boltzmann equation approach
• Influence of trigonal warping on interference effects in bilayer graphene
• Nonreciprocal Transmission of Microwave Acoustic Waves in Nonlinear Parity-Time Symmetric Resonators
• Nonlinear Optical Properties of Transition Metal Dichalcogenide MX${}_2$ (M = Mo, W; X = S, Se) Monolayers and Trilayers from First-principles Calculations
• Ballistic and shift currents in the bulk photovoltaic effect theory
• Shift charge and spin photocurrents in Dirac surface states of topological insulator
• Quantum Kinetic Theory of the Chiral Anomaly
• Resonant photovoltaic effect in doped magnetic semiconductors
• Localized Excitons in NbSe${}_2$-MoSe${}_2$ Heterostructures
• Basic formulation and first-principles implementation of nonlinear magneto-optical effects
• Anisotropic effect of warping on the lifetime broadening of topological surface states in angle-resolved photoemission from Bi${}_2$Te${}_3$
• Optical generation and detection of pure valley current in monolayer transition metal dichalcogenides
• Local photo-excitation of shift current in noncentrosymmetric systems
• Generalized Bloch theorem and topological characterization
• Many-Body Effects in Third Harmonic Generation of Graphene

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