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cond-mat.mes-hall2022★ 11 cited
Semiclassical dynamics of electrons in space-time crystal: Magnetization, polarization, and current response
Qiang Gao, Qian Niu
A space-time crystal is defined as a quantum mechanical system with both spatial and temporal periodicity. Such a system can be described by the Floquet-Bloch (FB) theory. We first…
cond-mat.mes-hall2022★ 31 cited
Symmetry Origin of Lattice Vibration Modes in Twisted Multilayer Graphene: Phasons vs Moiré Phonons
Qiang Gao, Eslam Khalaf
Lattice dynamics play a crucial role in the physics of Moiré systems. In twisted bilayer graphene (TBG), it was shown that, in addition to the graphene phonons, there is another se…
cond-mat.mes-hall2021
DC Current Generation and Power Feature in Strongly Driven Floquet-Bloch Systems
Qiang Gao, Yafei Ren, Qian Niu
We study the DC current generation in a periodically driven Bloch system connected to a heat bath. Under a relaxation time approximation, the density matrix for such a system is ob…