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Single Photons, Phonons and Spins in Atomically Thin WSe2

Event Details:

Thursday, June 20, 2019
2:00pm - 3:00pm PDT


Shriram 262

Single Photons, Phonons and Spins in Atomically Thin WSe2

Ajit Srivastava
Department of Physics
Emory University

Monolayer transition metal dichalcogenides (TMDs), such as WSe2, are atomically thin semiconductors with a “valley” degree of freedom, which can be optically addressed, thus opening up exciting possibilities for quantum “valleytronics”. Recently, naturally occurring single quantum emitters, believed to be excitons trapped in shallow potentials, were reported in TMDs [1]. They seem to inherit the valley degree of freedom from the host TMD and owing to their longer lifetimes, appear promising for quantum information processing applications.

In this talk, I will begin by highlighting some unique properties of TMDs excitons which result from the off-Gamma-point origin of the constituent single particle electronic states. After describing the basic properties of quantum dots in TMDs, I will present evidence for quantum entanglement between chiral phonons of the 2D host and single photons emitted from the quantum dots [2]. I will also present evidence for optical initialization of single spin-valley in WSe2 FET devices [3]. Finally, I will discuss our future plans for implementing a dynamically tunable array of qubits in pristine TMDs which can serve as an ideal platform for quantum information processing applications and also for understanding fundamental many-body physics.

[1] Srivastava et al., Nature Nano. 10, 491-496 (2015).
[2] X. Chen, X. Lu, S. Dubey et al., Nature Phys. 15, 221-227 (2019).
[3] X. Lu, X. Chen, S. Dubey et al., Nature Nano. 14, 426-431 (2019).

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