Premala Chandra - Light-Induced Orders that Oscillate in Space and in Time (March 4, 2025)
Автор: Flatiron Institute
Загружено: 2025-03-21
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In this talk Premala Chandra will present a general mechanism for light-induced generation of tunable incommensurate orders in materials not initially close to any phase transition; this alternative pathway results from the interplay of nonlinearity, parametric resonance and spatial dispersion. Premala Chandra will discuss how driving optical phonons above a threshold fluence induces spatiotemporal orders, where material properties oscillate at an incommensurate wavevector qO in space and at half the drive frequency in time. The order is robust against temperature on timescales much larger than the lifetime of the excited modes and can be accompanied by a static 2q0 modulation. Predictions for time-resolved diffraction and estimates for candidate materials. will be presented. These results show the possibility of using THz waves in solids to realize tunable incommensurate orders on the nanoscale....
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