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arXiv 1807.07019cond-mat.mes-hall
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单分子自旋动力学的自旋相关热特征

Spin-dependent heat signatures of single-molecule spin dynamics

Henning Hammar, Juan-David Vasquez Jaramillo, Jonas Fransson

摘要:

研究了单分子磁体在随时间变化的电压脉冲作用下的瞬态自旋相关热电特性。我们使用非平衡格林函数和广义自旋运动方程结合分子的动态电子结构的系统模型。我们表明,在系统中产生的热流是由于电荷和自旋的贡献,与珀尔帖和自旋相关的珀尔帖效应。由于单分子的自旋动力学,热流中也存在明显的特征,并且有可能通过偏压、隧穿耦合和交换相互作用来控制自旋相关的热流。发现由于局部塞曼分裂,随着偏置电压的增加,分子中的净热传递发生逆转,并且我们可以将净热传递与系统中的局部各向异性和动态交换场相关联。

英文摘要:

We investigate transient spin-dependent thermoelectric signatures in a single-molecule magnet under the effect of a time-dependent voltage pulse. We model the system using nonequilibrium Green's functions and a generalized spin equation of motion incorporating the dynamic electronic structure of the molecule. We show that the generated heat current in the system is due to both charge and spin contributions, related to the Peltier and the spin-dependent Peltier effect. There is also a clear signature in the heat current due to the spin dynamics of the single-molecule and a possibility to control the spin-dependent heat currents by bias, tunneling coupling and exchange interaction. A reversal of the net heat transfer in the molecule is found for increasing bias voltage due to the local Zeeman split and we can correlate the net heat transfer with the local anisotropies and dynamic exchange fields in the system.

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