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Ballistic heat transport of quantum spin excitations as seen in SrCuO_2

机译:在SrCuO_2中看到的量子自旋激发的弹道热传递

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摘要

Fundamental conservation laws predict ballistic, i.e., dissipationless transport behavior 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 SrCuO_2 and observe a huge magnetic heat conductivity κ_(mag). An extremely large spinon mean-free path of more than a micrometer demonstrates that κ_(mag) is only limited by extrinsic scattering processes which is a clear signature of ballistic transport in the underlying spin model.
机译:基本的守恒定律预测弹道,即一维量子磁体中的无耗散传输行为。但是,从那时以来一直缺乏这种异常运输的实验证据。在这里,我们提供了S = 1/2海森堡链中弹道热传递的实验证据。特别是,我们研究了链状铜酸盐SrCuO_2的高纯度样品,并观察到巨大的磁导率κ_(mag)。大于一微米的超大自旋平均自由程表明κ_(mag)仅受外在散射过程的限制,这是基础自旋模型中弹道运输的明确标志。

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