Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D24: Floquet engineering of 2D materialsInvited
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Sponsoring Units: DCMP Chair: Mohsen Yarmohammadi, University of Texas at Dallas Room: Room 237 |
Monday, March 6, 2023 3:00PM - 3:36PM |
D24.00001: Direct and indirect Floquet engineering of band topology and magnetism in two-dimensional materials Invited Speaker: Gregory A Fiete In this talk I will discuss recent theoretical developments in the Floquet engineering of two-dimensional materials, including those with a "twist" between the layers. With the scenario of a laser driving the material in mind, I will focus on two distinct regimes: (1) A "direct" regime where the dominant coupling of the laser is to the electronic degrees of freedom and (2) and "indirect" regime where the dominant coupling of the laser is to the lattice degrees of freedom. In regime (1), I will present some methods to describe low-frequency drives (where a Magnus expansion typically fails), an approach to change the interlayer hopping in a twisted material using a waveguide, and a treatment of electronic and lattice coupling on equal footing. In regime (2), I will present a non-linear phononics approach to modifying magnetism and electronic band topology in two-dimensional materials through direct coupling of the light to IR phonons that couple non-linearly to Raman modes which in turn induce magnetic and band topology transitions. I will focus on the examples of CrI3 for magnetism change, and MnBi2Te4/MnSb2Te4 for a magnetism combined with band topology change induced via non-linear phononics. I will conclude with an outlook on the field, including challenges for both theory and experiment in the Floquet engineering of two-dimensional materials. |
Monday, March 6, 2023 3:36PM - 4:12PM |
D24.00002: Floquet band engineering in van der Waals magnets Invited Speaker: David Hsieh Periodic driving with light can in principle be used to alter the effective exchange interactions in magnetic materials in a bond selective manner, opening the way to dynamically stabilize magnetic orders that are difficult to access in thermal equilibrium. However, owing to the large electric field amplitudes necessary, it is challenging to overcome runaway heating effects. One approach to potentially mitigate absorption-induced heating is to drive insulating systems at photon energies inside transparency windows below the bandgap. In this talk, I will report on recent progress we have made using this approach to coherently engineer the band structure of 2D van der Waals magnets, and how these effects can be leveraged to control their structural dynamics. |
Monday, March 6, 2023 4:12PM - 4:48PM |
D24.00003: Light-matter control of quantum materials: from Floquet to cavity Invited Speaker: Michael A Sentef The past decade has seen tremendous progress in our ability to control quantum materials with short laser pulses (light-induced phase transitions, Floquet dressed states) [1]. More recently, enhanced light-matter coupling in cavity quantum electrodynamical surroundings has been suggested as an alternative pathway for light-matter control [2]. In this talk I will show selected recent highlights in both subfields. (1) The birth of Floquet control of topological insulator surface states induced by terahertz pulses on sub- to few-cycle time scales tracked by angle-resolved photoemission spectroscopy with unprecedented energy-time resolution [3]. (2) Steps towards inducing superconductivity in 2D materials on surfaces by employing hybrid light-matter excitations [4]. An outlook of promising future directions and challenges along the way will be given. |
Monday, March 6, 2023 4:48PM - 5:24PM |
D24.00004: Dynamical Symmetry Breaking in Optically Driven Two-Dimensional Materials Invited Speaker: Netanel Lindner Floquet engineering of bandstructures via application of coherent time-periodic drives is emerging as a powerful tool for creating new types of topological phases of matter. In this talk, I will show how this tool can also be used to induce non-equilibrium correlated states with dynamical spontaneously broken symmetry. I will present two different manifestations of this phenomenon, which are unique to periodically driven systems, and discuss how they can arise in optically driven two dimensional materials. The first involves spontaneously broken quantum liquid crystalline order, with extreme anisotropy whose directionality rotates as a function of time. The second occurs under a slow (and periodical) modulation of the driving amplitude, which drives the system into a steady state with spontenously broken translational symmetry. I will show that the phase transition to these correlated steady states is achieved due to the interplay between the coherent external drive, electron-electron interactions, and dissipative processes arising from the coupling to phonons and the electromagnetic environment. Finaly, I will discuss candidate systems for realizing these non-equilbrium phases of matter, and their interplay with the topology of the underlying Floquet bandstructure. |
Monday, March 6, 2023 5:24PM - 6:00PM |
D24.00005: Observing edge dynamics in topological Floquet systems Invited Speaker: Christoph Braun Floquet engineering, i.e., periodic modulation of a system’s parameters, has proven as a powerful experimental tool for the realization of quantum systems with exotic properties that have no static analog. In particular, the so-called anomalous Floquet phase displays topological properties even if the Chern number of the bulk band vanishes [1] |
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