通过强局域电子冷却和加热核自旋
Cooling and heating nuclear spins by strongly localized electrons
AI总结：
本文提出一种微观理论，统一了核自旋温度概念与中心自旋模型，揭示强局域电子冷却核自旋需强外磁场，且加热时间随磁场变化可达数个数量级。
摘要：
几十年来，核自旋温度的概念一直是各种半导体结构中电子动态核自旋极化理论的基石。然而，由于强局域电子具有较长的自旋关联时间，这一概念并不总是适用。这促使人们使用过度简化的中心自旋模型来描述量子点中的核自旋动力学。在此，我们提出一种微观理论，通过描述具有长电子自旋关联时间的系统中的核自旋热力学，弥合了这两种方法之间的差距。重要的是，我们的理论预测，通过强局域电子实现有效的核自旋冷却需要一个远超过核自旋-自旋相互作用局域场的外部磁场，并且未极化电子对核自旋的加热时间可能随磁场变化几个数量级。
英文摘要：
The concept of nuclear spin temperature has been a cornerstone of the theory of dynamic nuclear spin polarization by electrons in various semiconductor structures for decades. Still, it is not always applicable to strongly localized electrons due to their long spin correlation times. This motivated the use of the oversimplified central spin model for the description of the nuclear spin dynamics in quantum dots. Here, we present a microscopic theory that bridges the gap between these two approaches by describing the nuclear spin thermodynamics for systems with long electron spin correlation times. Importantly, our theory predicts that efficient nuclear spin cooling by strongly localized electrons requires an external magnetic field by far exceeding the local field of nuclear spin-spin interaction, and that the time of the nuclear spin heating by unpolarized electrons may change by several orders of magnitude depending on the magnetic field.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
