Generation of chiral solitons in antiferromagnetic chains by a quantum quench

Article

关键词: DENSITY-MATRIX RENORMALIZATION;    SPIN-PEIERLS SYSTEMS;    OPTICAL LATTICE;    ULTRACOLD ATOMS;    DYNAMICS;    EXCITATIONS;    TRANSITION;    PHYSICS;    CUGEO3;    STATES;   

DOI  :  10.1103/PhysRevB.88.195125

来源: SCIE

【 摘 要 】

We analyze the time evolution of a magnetic excitation in a spin-1/2 antiferromagnetic Heisenberg chain after a quantum quench. By a proper modulation of the magnetic exchange coupling, we prepare a static soliton of total spin 1/2 as an initial spin state. Using bosonization and a numerical time-dependent density matrix renormalization group algorithm, we show that the initial excitation evolves to a state composed of two counterpropagating chiral states, which interfere to yield < S-z > = 1/4 for each mode. We find that these dynamically generated states remain considerably stable as time evolution is carried out. We propose spin-Peierlsmaterials and ultracold-atom systems as suitable experimental scenarios in which to conduct and observe this mechanism.

【 授权许可】

Free