Transport as a sensitive indicator of quantum criticality
Transport as a sensitive indicator of quantum criticality
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DOI：
10.1088/0953-8984/26/26/265001
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
G. Schaller;M. Vogl;Tobias Brandes
中科院分区：
文献类型：
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作者：
G. Schaller;M. Vogl;Tobias Brandes
我们考虑通过一维自旋系统的玻色子输运。通过将自旋系统耦合到保持在不同温度下的玻色子库来诱导输运。在自旋与玻色子弱耦合的极限下，我们应用量子光学主方程计算了从源到漏库的能量传输。在大的热偏置，我们发现，电流的纵向运输变得独立的链长，也没有受到严重影响的存在下的障碍。相反，在低温度下，电流与链长成反比，并且在无序存在下进一步抑制。我们还发现，基态的临界行为映射到临界行为的电流，即使在配置与无限的热偏置。
We consider bosonic transport through one-dimensional spin systems. Transport is induced by coupling the spin systems to bosonic reservoirs kept at different temperatures. In the limit of weak-coupling between spins and bosons we apply the quantum-optical master equation to calculate the energy transmitted from source to drain reservoirs. At large thermal bias, we find that the current for longitudinal transport becomes independent of the chain length and is also not drastically affected by the presence of disorder. In contrast, at small temperatures, the current scales inversely with the chain length and is further suppressed in the presence of disorder. We also find that the critical behaviour of the ground state is mapped to critical behaviour of the current—even in configurations with infinite thermal bias.