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Tailoring Magnetic Properties through Photon-Dressed States

Tailoring Magnetic Properties through Photon-Dressed States

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When Nov 17, 2021
from 12:45 pm to 02:00 pm
Speaker Wang-Kong Tse Ph.D.
Speaker Information Speaker Bio: Dr. Wang-Kong Tse is a theoretical condensed matter physicist specializing in the properties of quantum materials and low-dimensional electron systems. He received his Ph.D. from the University of Maryland in 2008, and then worked as a postdoctoral researcher at the University of Texas at Austin. In 2013 he moved to the Los Alamos National Laboratory for a second postdoctoral appointment under a Director’s Postdoctoral Fellowship Award. He joined the University of Alabama in 2015 and is currently associate professor at the Department of Physics and Astronomy. He is a recipient of the Department of Energy Early Career Award in 2018.
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When: Wednesday, Nov 17th, 2021, virtual coffee: 12:45 pm, colloquium: 1:00-2:00 pm

Where: https://us02web.zoom.us/j/84064498104?pwd=RUpEdHJUZU42cDVkNjNHR2RGUE5NUT09

Meeting ID: 840 6449 8104
Passcode: 488558

 

Abstract:
Periodically driven electronic materials constitute a new paradigm in which far-from-equilibrium physics plays a central role in the materials' behavior. Floquet states are photon-dressed electronic states that emerge when driven by a time periodic optical excitation. Instead of the conventional picture of multiphoton transitions between equilibrium bands, an equivalent view that offers more profound insights is to think of these transitions as transitions between Floquet sidebands. In this colloquium we will introduce the concept of Floquet states and discuss our recent works on periodically irradiated two-dimensional electron systems. In systems with magnetic impurities, we show that Floquet driving leads to new and qualitatively different regimes of magnetic exchange interaction between impurities mediated by itinerant electrons that are driven by circularly polarized light. Our work sheds light on the possibility of dynamic tuning of the indirect exchange interaction in magnetically doped materials and magnetic heterostructures.

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