论文标题
拓扑半学NBSB $ _2 $中的巨大的Nernst Power因子
Colossal Nernst power factor in topological semimetal NbSb$_2$
论文作者
论文摘要
如今，由于缺乏良好的热电和/或热磁材料，由于缺乏良好的热电和/或热磁材料，液态氮沸腾温度（77 K）（77 K）（77 K）（77 K）受到极大限制。在这里，我们报告发现巨大的nernst Power因子为3800 $ \ times $ 10 $^{ - 4} $ w m $^{ - 1} $ k $^{ - 2} $在25 k下5 t下于25 k和高nernst of Nernst Bigure-Merit，71 $ \ times $ 10 $ 10 $ 10 $^{ - 4} $ K $^a $^a $^in tupl ot NBSB $ _2 $单晶。观察到的高热磁性性能归因于大型Nernst热电器和纵向电导率，以及相对较低的横向导热率。大型且不饱和的Nernst Thermotower是NBSB $ _2 $的高度期望的电子结构的结果，该结构具有补偿的高移动性电子和Fermi水平附近的高移动性电子和孔，以及强烈的声子驱动器效应。这一发现为探索材料选择的途径开放，用于在液态氮气温度以下的固态热泵。
Today solid-state cooling technologies below liquid nitrogen boiling temperature (77 K), crucial to quantum information technology and probing quantum state of matter, are greatly limited due to the lack of good thermoelectric and/or thermomagnetic materials. Here, we report the discovery of colossal Nernst power factor of 3800$\times$10$^{-4}$ W m$^{-1}$ K$^{-2}$ under 5 T at 25 K and high Nernst figure-of-merit of 71$\times$10$^{-4}$ K$^{-1}$ under 5 T at 20 K in topological semimetal NbSb$_2$ single crystals. The observed high thermomagnetic performance is attributed to large Nernst thermopower and longitudinal electrical conductivity, and relatively low transverse thermal conductivity. The large and unsaturated Nernst thermopower is the result of the combination of highly desirable electronic structures of NbSb$_2$ having compensated high mobility electrons and holes near Fermi level and strong phonon-drag effect. This discovery opens an avenue for exploring material option for the solid-state heat pumping below liquid nitrogen temperature.
