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Physics Colloquium

Thursday, May 29, 2025
4:00pm to 5:00pm
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Online and In-Person Event
Xiaodong Xu, Boeing Professor of Physics, Department of Physics, Department of Materials Science and Engineering, University of Washington,

Fractional Quantum Anomalous Hall Effect

The interplay between spontaneous symmetry breaking and topology can result in exotic quantum states of matter. A celebrated example is the quantum anomalous Hall (QAH) effect, which exhibits an integer quantum Hall effect at zero magnetic field due to topologically nontrivial bands and intrinsic magnetism. In the presence of strong electron-electron interactions, fractional-QAH (FQAH) effect at zero magnetic field can emerge, which is a lattice analog of fractional quantum Hall effect without Landau level formation. In this talk, I will first briefly discuss the experimental observation of FQAH effect in twisted MoTe2 bilayer, using combined magneto-optical and -transport measurements. Then I will present new developments in this direction, including the observation of nearly ideal FQAH effect, abundant Jain sequence of fractional Chern insulator states, as well as optical control of topology. Direct observation of the FQAH and associated effects paves the way for researching charge fractionalization and anyonic statistics at zero magnetic field.

Join via Zoom:
 https://caltech.zoom.us/j/89860951893
Meeting ID: 818 6692 9019

The colloquium is held in Feynman Lecture Hall, 201 E. Bridge.

For more information, please contact Annika Keating by phone at 626-395-6115 or by email at [email protected].
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Physics Colloquium Series
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