Semiclassical dynamics of spin density waves
| Autor: | Hidemaro Suwa, Cristian D. Batista, Gia-Wei Chern, Zhentao Wang, Kipton Barros |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Spin polarization Strongly Correlated Electrons (cond-mat.str-el) Non-equilibrium thermodynamics Semiclassical physics FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Adiabatic theorem Condensed Matter - Strongly Correlated Electrons Quantum state Lattice (order) Quantum mechanics Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Structure factor Quantum |
| Popis: | We present a theoretical framework for equilibrium and nonequilibrium dynamical simulation of quantum states with spin-density-wave (SDW) order. Within a semiclassical adiabatic approximation that retains electron degrees of freedom, we demonstrate that the SDW order parameter obeys a generalized Landau-Lifshitz equation. With the aid of an enhanced kernel polynomial method, our linear-scaling quantum Landau-Lifshitz dynamics (QLLD) method enables dynamical SDW simulations with $N \simeq 10^5$ lattice sites. Our real-space formulation can be used to compute dynamical responses, such as dynamical structure factor, of complex and even inhomogeneous SDW configurations at zero or finite temperatures. Applying the QLLD to study the relaxation of a noncoplanar topological SDW under the excitation of a short pulse, we further demonstrate the crucial role of spatial correlations and fluctuations in the SDW dynamics. 17 pages, 5 figures |
| Databáze: | OpenAIRE |
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