量子临界点附近温度猝灭核自旋的涨落诱导放热
Fluctuation-Induced Heat Release from Temperature-Quenched Nuclear Spins near a Quantum Critical Point
摘要：
在量子临界点（QCP）--一个连续相变线终止的零温度奇点--量子涨落在空间和时间上发散，导致可以在非零温度下观察到的奇异现象。使用量子反铁磁体，我们提出的热量证据表明，核自旋冻结在高温亚稳态的温度淬火退火的量子涨落附近的QCP。这种现象，随着核自旋退火时容易检测到的热释放，作为QCP周围量子临界区域的一个很好的标记，并提供了发散量子涨落动力学的探针。
英文摘要：
At a quantum critical point (QCP) -- a zero-temperature singularity in which a line of continuous phase transition terminates -- quantum fluctuations diverge in space and time, leading to exotic phenomena that can be observed at non-zero temperatures. Using a quantum antiferromagnet, we present calorimetric evidence that nuclear spins frozen in a high-temperature metastable state by temperature quenching are annealed by quantum fluctuations near the QCP. This phenomenon, with readily detectable heat release from the nuclear spins as they are annealed, serves as an excellent marker of a quantum critical region around the QCP and provides a probe of the dynamics of the divergent quantum fluctuations.
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