Coherent spin-current oscillations in transverse magnetic fields

Abstract

We address the coherence of the dynamics of spin-currents with components transverse to an external magnetic field for the spin-1/2 Heisenberg chain. We study current autocorrelations at finite temperatures and the real-time dynamics of currents at zero temperature. Besides a coherent Larmor oscillation, we find an additional collective oscillation at higher frequencies, emerging as a coherent many-magnon effect at low temperatures. Using numerical and analytical methods, we analyze the oscillation frequency and decay time of this coherent current-mode versus temperature and magnetic field.

4 pages, 5 figures (and supplemental material: 4 pages, 6 figures)

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• Adjacent Spin Operator Dynamical Structure Factor of the S=1/2 Heisenberg Chain
• Integrability breaking and bound states in Google's decorated XXZ circuits
• Information scrambling and redistribution of quantum correlations through dynamical evolution in spin chains
• Remotely detecting the signal of a local decohering process in spin chains
• Interference of the signal from a local dynamical process with the quantum state propagation in spin chains
• Real-Time Dynamics of a Spin Chain with Dzyaloshinskii-Moriya Interactions: Spiral Formation and Quantum Spin Oscillations