Thermomagnetic Anomalies by Magnonic Criticality in Ultracold Atomic Transport

作     者：Yuta Sekino Yuya Ominato Hiroyuki Tajima Shun Uchino Mamoru Matsuo 

作者机构：Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) Nonequilibrium Quantum Statistical Mechanics RIKEN Hakubi Research Team RIKEN Cluster for Pioneering Research (CPR) Wako Saitama 351-0198 Japan RIKEN Cluster for Pioneering Research (CPR) Astrophysical Big Bang Laboratory (ABBL) Wako Saitama 351-0198 Japan  Waseda Institute for Advanced Study Department of Physics School of Science Faculty of Science and Engineering CAS Center for Excellence in Topological Quantum Computation Advanced Science Research Center  Wako Saitama 351-0198 Japan 

出 版 物：《Physical Review Letters》 (Phys Rev Lett)

年 卷 期：2024年第133卷第16期

页      面：163402页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：r-EMU RIKEN Matsuo Foundation Ministry of Education, Culture, Sports, Science and Technology, MEXT National Natural Science Foundation of China, NSFC, (12374126) National Natural Science Foundation of China, NSFC Chinese Academy of Sciences, CAS, (XDB28000000) Chinese Academy of Sciences, CAS Precursory Research for Embryonic Science and Technology, PRESTO, (JPMJPR2351) Precursory Research for Embryonic Science and Technology, PRESTO Japan Society for the Promotion of Science, JSPS, (JP21H01800, JP24H00322, JP22K13981, JP23H01839, JP21K03436, JP22H01158, JP21H04565, JP20H01863, JP19J01006) Japan Society for the Promotion of Science, JSPS Exploratory Research for Advanced Technology, ERATO, (JPMJER2302) Exploratory Research for Advanced Technology, ERATO 

主　　题：Cold gases in optical lattices Magnons Magnetic insulators Magnetic tunnel junctions Nonequilibrium Green's function Spin wave theory 

摘      要：We investigate thermomagnetic transport in an ultracold atomic system with two ferromagnets linked via a magnetic quantum point contact. Using the nonequilibrium Green’s function approach, we show a divergence in spin conductance and a slowing down of spin relaxation that manifest in the weak effective-Zeeman-field limit. These anomalous spin dynamics result from the magnonic critical point at which magnons become gapless due to spontaneous magnetization. Our findings unveil untapped dynamics in ultracold atomic systems, opening new avenues in thermomagnetism.