Tuesday, July 9, 2013

1307.1726 (Jie Ren et al.)

Theory of asymmetric and negative differential magnon tunneling under
temperature bias: towards spin Seebeck diode and transistor

Jie Ren, Jian-Xin Zhu
We present a microscopic theory for the asymmetric and negative differential magnon tunneling driven by temperature bias. We demonstrate that the many-body magnon interaction that makes the magnonic spectrum temperature-dependent is the crucial factor for the emergence of rectification and negative differential spin Seebeck effects in magnon tunneling junctions. That is, when magnonic junctions have temperature-dependent density of states, reversing the temperature bias is able to give asymmetric spin currents and increasing temperature bias could give an anomalously decreasing magnonic spin current. We show that these properties are relevant for building spin Seebeck diodes and transistors, which could play important roles in controlling information and energy in magnonics and spin caloritronics.
View original: http://arxiv.org/abs/1307.1726

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