The NQPI Seminar Series presents Martin Rodriquez-Vega of University of Texas at Austin, on Thursday, Oct. 3, at 4:10 p.m. in Clippinger Labs 194.
Martin Rodriquez-Vega
Abstact: Light-induced topological band structure changes and the control of ordered states of matter are currently among the most sought-after effects in condensed matter physics. In the first part of this talk, we will discuss a theory to derive analytic effective Floquet Hamiltonians in the low-frequency regime. This method is useful in providing a realistic description of off-resonant drives for multi-band solid-state systems. As a prototypical example, we apply this theory to periodically-driven graphene. We derive its Floquet spectrum and calculate its topological invariants. Then, in the second part of this talk, we will review our recent efforts towards the control of magnetic order in materials using low-frequency drives. Typically, this regime corresponds to THz frequencies, where phonon effects become relevant. We will discuss group theory aspects of this problem applied to recently-discovered two-dimensional magnetic materials.
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