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Coherent spin-current oscillations in transverse magnetic fields.

Robin Steinigeweg¹, Stephan Langer, Fabian Heidrich-Meisner

¹Institute for Theoretical Physics, Technical University Braunschweig, Braunschweig, Germany. r.steinigeweg@tu-bs.de

Physical Review Letters

|May 24, 2011

Summary

We discovered a new collective oscillation in spin-1/2 Heisenberg chains, beyond Larmor motion. This coherent many-magnon effect appears at low temperatures, influencing spin-current dynamics.

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Area of Science:

Condensed matter physics
Quantum magnetism

Background:

The spin-1/2 Heisenberg chain is a fundamental model in quantum magnetism.
Understanding spin-current dynamics is crucial for spintronics and quantum information.
External magnetic fields significantly influence magnetic systems.

Purpose of the Study:

To investigate the coherence of transverse spin-current dynamics in a spin-1/2 Heisenberg chain.
To analyze the temperature and magnetic field dependence of these dynamics.

Main Methods:

Numerical simulations of spin-current autocorrelations.
Analytical methods for real-time dynamics at zero temperature.
Investigation of current oscillations and decay times.

Main Results:

Observed a coherent Larmor oscillation.
Identified an additional, higher-frequency collective oscillation.
This collective mode emerges as a many-magnon effect at low temperatures.

Conclusions:

The dynamics of transverse spin-currents in the spin-1/2 Heisenberg chain exhibit complex coherent behavior.
A novel collective oscillation, driven by many-magnon interactions, is present at low temperatures.
The frequency and decay of this mode are sensitive to temperature and magnetic field.