25-29 January 2019
LBL-Hill
US/Pacific timezone

Valley-Mechanical Coupling in a Monolayer Semiconductor

27 Jan 2019, 15:30
25m
Building 66- Auditorium (LBL-Hill)

Building 66- Auditorium

LBL-Hill

Lawrence Berkeley National Lab Berkeley, California
Condensed matter applications Condensed Matter I

Speaker

Mr Haokun Li (University of California, Berkeley)

Description

The interaction of macroscopic mechanical object with electron charge and spin plays a vital role in today’s information technology and fundamental studies of the quantum-classical boundary. Recently emerged valleytronics encodes information to the valley degree-of-freedom and promises exciting applications in communication and computation. We realize valley-mechanical coupling in a monolayer MoS2 resonator and demonstrate transduction of valley information to the mechanical states. The valley and mechanical degrees-of-freedom are coupled through the magnetic moment of the valley carriers under a magnetic field gradient. We identify the valley-actuated mechanical motion by optical interferometry and attain a transduction confidence level near unity. Our experiment lays the foundation for a new class of valley-controlled mechanical devices and facilitates realization of hybrid quantum valley-mechanical systems.

Primary authors

Mr Haokun Li (University of California, Berkeley) Dr King Yan Fong (University of California, Berkeley)

Co-author

Prof. Xiang Zhang (University of California, Berkeley)

Presentation Materials

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