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arXiv 2109.00352cond-mat.mtrl-sci
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固体中的三重离子电流产生

Triplon current generation in solids

Yao Chen, Masahiro Sato, Yifei Tang, Yuki Shiomi, Koichi Oyanagi, Takatsugu Masuda, Yusuke Nambu, Masaki Fujita, Eiji Saitoh

摘要:

三体子是指携带角动量$S = 1$的虚拟粒子,其对应于大类量子二聚自旋系统中的元激发。这种没有磁序的系统长期以来一直被研究作为自旋量子特性的试验场。虽然已经发现在具有单重态关联的二聚磁体中,三重子在热和磁性质中起着中心作用,但尚未检测到由三重子携带的自旋角动量流,即三重子电流。在这里,我们报告的自旋Seebeck效应引起的三重子电流:三重子自旋Seebeck效应,使用自旋Peierls系统CuGeO $_3$。结果表明,与磁体中的自旋波情况相反,加热驱动的三体子输运过程中产生了符号为正的自旋流。三重子自旋Seebeck效应远低于自旋Peierls转变温度,与理论计算的三重子自旋Seebeck效应一致。

英文摘要:

A triplon refers to a fictitious particle that carries angular momentum $S = 1$ corresponding to the elementary excitation in a broad class of quantum dimerized spin systems. Such systems without magnetic order have long been studied as a testing ground for quantum properties of spins. Although triplons have been found to play a central role in thermal and magnetic properties in dimerized magnets with singlet correlation, a spin angular momentum flow carried by triplons, a triplon current, has not been detected yet. Here we report spin Seebeck effects induced by a triplon current: triplon spin Seebeck effect, using a spin-Peierls system CuGeO$_3$. The result shows that the heating-driven triplon transport induces spin current whose sign is positive, opposite to the spin-wave cases in magnets. The triplon spin Seebeck effect persists far below the spin-Peierls transition temperature, being consistent with a theoretical calculation for triplon spin Seebeck effects.

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。

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