Ballistic heat transport of quantum spin excitations as seen in SrCuO2

Abstract

Fundamental conservation laws predict ballistic, i.e., dissipationless transport behaviour in one-dimensional quantum magnets. Experimental evidence, however, for such anomalous transport has been lacking ever since. Here we provide experimental evidence for ballistic heat transport in a S=1/2 Heisenberg chain. In particular, we investigate high purity samples of the chain cuprate SrCuO2 and observe a huge magnetic heat conductivity ${\kappa }_{mag}$. An extremely large spinon mean free path of more than a micrometer demonstrates that ${\kappa }_{mag}$ is only limited by extrinsic scattering processes which is a clear signature of ballistic transport in the underlying spin model.

References in corpus (5)

• Heat conduction in low-dimensional quantum magnets
• Thermal transport of the XXZ chain in a magnetic field
• Evidence for Ballistic Thermal Conduction in the One-Dimensional S=1/2 Heisenberg Antiferromagnetic Spin System Sr2CuO3
• Magnon Heat Conductivity and Mean Free Paths in Two-Leg Spin Ladders: A Model-Independent Determination
• Transport Control in Low-Dimensional Spin-1/2 Heisenberg Systems

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