Takashi Oka received his Ph.D. in Science from the University of Tokyo in 2005. From 2005 to 2006, he worked as a postdoctoral researcher at the National Institute of Advanced Industrial Science and Technology (AIST). From 2006 to 2012, he served as an Assistant Professor in the Department of Physics at the University of Tokyo, and from 2012 to 2015, he held the position of Lecturer in the Department of Applied Physics at the same university. From 2015 to 2020, he was a Group Leader at the Max Planck Institute for the Physics of Complex Systems and the Max Planck Institute for Chemical Physics of Solids. Since 2020, he has been a Professor at the Institute for Solid State Physics, the University of Tokyo. His research focuses on theoretical condensed matter physics, particularly nonequilibrium quantum many-body systems and quantum control.
Presentation Title:
Quantum Geometry and Floquet Engineering in Lightwave Electronics
Presentation Abstract:
We discuss how lightwave-driven electron systems exhibit rich quantum geometric effects and enable new control and detection methods of quantum dynamics.
First, we introduce a geometric correction to the Landau–Zener tunneling amplitude in the presence of periodic driving fields.
This correction, expressed as a Berry connection, leads to a twisted Landau–Zener formula that opens the door to nonperturbative quantum control.
Second, we propose a homodyne detection scheme based on Dirac electrons in oscillating magnetic fields. The resulting pi-Landau levels provide a solid-state realization of homodyne mixing and offer a route toward lightwave-frequency quantum sensing.