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Conference Paper: Valley and spin curents in 2D transition metal dichalcogenides

TitleValley and spin curents in 2D transition metal dichalcogenides
Authors
Issue Date2015
PublisherAmerican Physical Society. The Conference program's website is located at https://meetings.aps.org/Meeting/MAR15/Session/S51
Citation
The 2015 March Meeting of the American Physical Society (APS), San Antonio, TX., 2-6 March 2015. How to Cite?
AbstractIn two-dimensional (2D) transition metal dichalcogenides (TMDs), carriers are indexed by both the spin and the valley pseudospin (labelling the degenerate band extrema in momentum space). 2D TMDs is therefore an ideal laboratory for exploring these internal quantum degrees of freedom for new electronics, and controlling the flow of spin and pseudospin is at the heart of such applications. We will discuss two mechanisms for generating spin and valley currents of electrons in 2D group-VIB TMDs: (I) the valley and spin Hall effects arising from the Berry curvatures; and (II) the nonlinear valley and spin currents arising from Fermi pocket anisotropy. The two effects have distinct scaling with the electric field, and different dependence of the current direction on the field direction and crystalline axis. We will discuss the possibility to observe and distinguish the two effects as distinct patterns of polarized electroluminescence at p-n junction in 2D TMDs. The nonlinear current response also makes possible the generation of pure spin and valley flows without net charge current, either by an AC bias or by an inhomogeneous temperature distribution. We will also discuss the valley Hall effect of charged excitons in monolayer TMDs, which arises from the effective coupling of the excitonic valley pseudospin to its center of mass motion by the exchange interaction between the electron and hole constituents.
DescriptionSession S51: Invited Session: The Valley Hall Effect in van der Waals Materials: no. S51.4
Persistent Identifierhttp://hdl.handle.net/10722/215419

 

DC FieldValueLanguage
dc.contributor.authorYao, W-
dc.date.accessioned2015-08-21T13:24:57Z-
dc.date.available2015-08-21T13:24:57Z-
dc.date.issued2015-
dc.identifier.citationThe 2015 March Meeting of the American Physical Society (APS), San Antonio, TX., 2-6 March 2015.-
dc.identifier.urihttp://hdl.handle.net/10722/215419-
dc.descriptionSession S51: Invited Session: The Valley Hall Effect in van der Waals Materials: no. S51.4-
dc.description.abstractIn two-dimensional (2D) transition metal dichalcogenides (TMDs), carriers are indexed by both the spin and the valley pseudospin (labelling the degenerate band extrema in momentum space). 2D TMDs is therefore an ideal laboratory for exploring these internal quantum degrees of freedom for new electronics, and controlling the flow of spin and pseudospin is at the heart of such applications. We will discuss two mechanisms for generating spin and valley currents of electrons in 2D group-VIB TMDs: (I) the valley and spin Hall effects arising from the Berry curvatures; and (II) the nonlinear valley and spin currents arising from Fermi pocket anisotropy. The two effects have distinct scaling with the electric field, and different dependence of the current direction on the field direction and crystalline axis. We will discuss the possibility to observe and distinguish the two effects as distinct patterns of polarized electroluminescence at p-n junction in 2D TMDs. The nonlinear current response also makes possible the generation of pure spin and valley flows without net charge current, either by an AC bias or by an inhomogeneous temperature distribution. We will also discuss the valley Hall effect of charged excitons in monolayer TMDs, which arises from the effective coupling of the excitonic valley pseudospin to its center of mass motion by the exchange interaction between the electron and hole constituents.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Conference program's website is located at https://meetings.aps.org/Meeting/MAR15/Session/S51-
dc.relation.ispartofAmerican Physical Society (APS) March Meeting 2015-
dc.rightsAmerican Physical Society (APS) March Meeting 2015. Copyright © American Physical Society.-
dc.titleValley and spin curents in 2D transition metal dichalcogenides-
dc.typeConference_Paper-
dc.identifier.emailYao, W: wangyao@hku.hk-
dc.identifier.authorityYao, W=rp00827-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.hkuros248380-
dc.publisher.placeUnited States-

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