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Colloquium:Quantum valley Hall effect and valleytronics in bilayer graphene

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Jun Zhu, The Pennsylvania State University
When
21 September 2017 from 4:00 PM to 5:00 PM
Where
117 Osmond Laboratory
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The advent of two-dimensional materials with hexagonal crystal symmetry offers a new electronic degree of freedom, namely valley, the manipulation and detection of which could potentially be exploited to form new many-body ground states as well as new paradigms of electronic applications. In this talk, I will describe our work in creating valley-momentum locked quantum wires, namely quantum valley Hall kink states, in Bernal stacked bilayer graphene. The quantum valley Hall kink states are created by generating a topological band structure using multiple gates and exhibit quantized conductance of 4e^2/h. They are signatures of the quantum valley Hall effect. I will also demonstrate the operations of a valley valve and a tunable electron beam splitter, which exploit unique attributes of this new helical 1D system. The high quality and versatile controls of the quantum valley Hall kink states open the door to many exciting possibilities in low-dimensional and topological systems.

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