Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session E63: New Developments in FQHE and Light-induced electronic phasesLive
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Sponsoring Units: DCMP Chair: Dominik Juraschek, Harvard University |
Tuesday, March 16, 2021 8:00AM - 8:36AM Live |
E63.00001: Ultrafast optical control of complex oxide functional properties: New insights from theory and first-principles calculations Invited Speaker: Nicole Benedek Recent experiments have demonstrated the potential for ultrafast changes in the functional properties of materials upon selective optical excitation of particular phonon modes. The chemical diversity of complex oxides, and their strong lattice-properties coupling, have made them ideal test systems for new experimental approaches that exploit anharmonic phonon couplings to induce and modify magnetism, superconductivity and ferroelectricity with light. |
Tuesday, March 16, 2021 8:36AM - 9:12AM Live |
E63.00002: Post Quench Dynanics of Couled Electronic Orders: Invited Speaker: Andrew Millis Motivated by recent experiments on optically induced superconductivity in systems with competing charge density wave and superconducting phases, and optically induced metallicity in systems with competing charge order and ferro magnetic phases we study the dynanmics of systems of coupled order parameters after a short intense light pulse. We show how differences in relaxation times compbined with order parameter competition can lead to evolution into metastable minima [1] and investigate the dynamics of an interface between two phases, derviiing conditions undere which the phase disfavored in equilibrium can actually expand [2] |
Tuesday, March 16, 2021 9:12AM - 9:48AM Live |
E63.00003: Dynamic control of topological and ferroelectric properties in 2D materials Invited Speaker: Aaron Lindenberg In two-dimensional layered quantum materials, the stacking order of the layers often determines the crystalline symmetry and associated properties such as Berry curvature, topology, and ferroelectricity. Electrical or optical stimuli can influence the free-energy landscape, making it possible to dynamically modify the stacking order and reveal hidden structures that host different quantum properties. In the first part of this talk I will discuss the application of terahertz frequency light pulses to drive interlayer shear excitations in WTe2, as probed by femtosecond electron diffraction techniques [1]. We find a new mechanism for directly modulating interlayer stacking and associated topological properties on picosecond time-scales. In the second part of this talk I will discuss the application of out-of-plane electric fields and electrostatic doping as a means of manipulating in-plane interlayer sliding to create multiple polar and centrosymmetric stacking orders in few layer WTe2. In-situ nonlinear Hall transport reveals that such stacking rearrangements result in a layer-parity-selective Berry curvature memory in momentum space, where the sign reversal of the Berry curvature and its dipole only occurs in odd-layer crystals. Our findings open an avenue towards exploring coupling between topology, electron correlations and ferroelectricity in hidden stacking orders and demonstrate a new low-energy-cost, electrically controlled memory in the atomically thin limit [2]. |
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