In-Person

Physics Club — Xiaodong Xu — University of Washington, Seattle

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Sloane Physics Laboratory, SPL 57
217 Prospect Street New Haven, CT 06511
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Shining Light on Fractional Charges

 

Fractionalization of the electron charge is one of the most striking phenomena arising from strong electron-electron interactions. A celebrated example is the emergence of anyons with fractionally charged excitations in fractional quantum Hall effect (FQH) states. Recently, fractional quantum anomalous Hall effect (FQAH), a lattice analog of the FQH realized at zero magnetic field, has been demonstrated. FQAH provides a unique platform to investigate anyons, yet their detection remains a challenge.

 

In this talk, I will first present transport measurements that establish FQAH in twisted MoTe2 bilayer. I will then show how ~1 eV photons can be used to probe fractional excitations that are three orders of magnitude lower in energy. The results include observation of an abundant Jain sequence of fractional states and a new type of quasi-particle complex, anyon-trions. Observation of the FQAH and associated phenomena pave the way for exploring charge fractionalization and anyonic physics at zero magnetic field.

 

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(This event will not have a livestream.  However a recording will be made available)