Triplon current generation in solids

Yao Chen, Masahiro Sato (), Yifei Tang, Yuki Shiomi, Koichi Oyanagi, Takatsugu Masuda, Yusuke Nambu, Masaki Fujita and Eiji Saitoh ()
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Yao Chen: Tohoku University
Masahiro Sato: Ibaraki University
Yifei Tang: Tohoku University
Yuki Shiomi: The University of Tokyo
Koichi Oyanagi: Tohoku University
Takatsugu Masuda: The University of Tokyo
Yusuke Nambu: Tohoku University
Masaki Fujita: Tohoku University
Eiji Saitoh: Tohoku University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract 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 CuGeO3. 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.

Date: 2021
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DOI: 10.1038/s41467-021-25494-7

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