Microscopic electron dynamics in nonlinear optical response of solids
- URL: http://arxiv.org/abs/2009.07527v3
- Date: Mon, 7 Dec 2020 10:50:55 GMT
- Title: Microscopic electron dynamics in nonlinear optical response of solids
- Authors: Daria Popova-Gorelova, Vladislav Guskov and Robin Santra
- Abstract summary: We show that even when a macroscopic optical response of a crystal is forbidden, the microscopic optical response can, in fact, be nonzero.
We also show how, within this framework, the direction of the instantaneous microscopic optically-induced electron current flow can be revealed.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We investigate the microscopic properties of the nonlinear optical response
of crystalline solids within Floquet theory, and demonstrate that
optically-induced microscopic charge distributions display complex spatial
structure and nontrivial properties. Their spatial symmetry and temporal
behavior are governed by crystal symmetries. We find that even when a
macroscopic optical response of a crystal is forbidden, the microscopic optical
response can, in fact, be nonzero. In such a case, the optically-induced charge
redistribution can be considerable, even though the corresponding Fourier
component of the time-dependent dipole moment per unit cell vanishes. We
develop a method that makes it possible to completely reconstruct the
microscopic optically-induced charge distributions by means of
subcycle-resolved x-ray-optical wave mixing. We also show how, within this
framework, the direction of the instantaneous microscopic optically-induced
electron current flow can be revealed.
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