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Physics Department presents Indirect Excitons

November 10 @ 12:00 pm 1:00 pm

Presented by Leonid V. Butov, University of California at San Diego

A spatially indirect exciton (IX), also known as an interlayer exciton, is a bound pair of an electron and a hole confined in separated layers. Due to their long lifetimes, IXs can cool below the temperature of quantum degeneracy and can travel long distances.

We will present direct measurements of spontaneous coherence and Bose-Einstein condensation of IXs. We will present phenomena observed in the IX condensate, including the spatially ordered exciton state, the commensurability effect of exciton density wave, the spin textures, the Pancharatnam-Berry phase and long-range coherent spin transport, and the interference dislocations.

IXs are dipoles and their energy can be controlled by voltage. This gives an opportunity to build devices, which operate with excitons in place of electrons. We will present excitonic devices, including excitonic transistor, trap, lattice, conveyer, ramp, and split-gate devices.

Quantum systems of IXs can be realized at high temperatures in van der Waals heterostructures. We will present localization and long-range transport of IXs in van der Waals heterostructures.

Meeting ID: 952 5858 9152
Passcode: 558807