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Giant spin Seebeck effect in a non-magneticmaterial The spin Seebeck effect is observed when a thermal gradient applied to a spin-polarized material leads to a spatially varying transverse spin current in an adjacent non-spin-polarized material, where it gets converted into a measurable voltage. It has been previously observed with a magnitude of microvolts per kelvin in magnetically orderedmaterials, ferromagneticmetals1, semiconductors2 and insulators3. Here we describe a signal in a non-magnetic semiconductor (InSb) that has the hallmarks of being produced by the spin Seebeck effect, but is three orders ofmagnitude larger (millivolts per kelvin). We refer to the phenomenon that produces it as the giant spin Seebeck effect. Quantizingmagnetic fields spin-polarize conduction electrons in semiconductors by means of Zeeman splitting, which spin¨Corbit couplingamplifies by a factor of 25 in InSb.Wepropose that the giant spin Seebeck effect is mediated by phonon¨Celectron drag, which changes the electrons¡¯momentumand directlymodifies the spin-splitting energy through spin¨Corbit interactions. Owing to the simultaneously strong phonon¨Celectron drag and spin¨Corbit coupling in InSb, the magnitude of the giant spin Seebeck voltage is comparable to the largest known classical thermopower value. ×ÔÐýÈû±´¿ËЧӦÊÇĿǰ´Åѧ±È½ÏÈȵãµÄÇ°ÑØÖ®Ò»£¬Ä¿Ç°¹úÄÚ¼¸¸öµ¥Î»±ÈÈçÎïÀíËù¡¢Î人Àí¹¤´óѧµÈ¶¼Â½Ðø¿ªÕ¹ÁËһЩ̽Ë÷¹¤×÷£¬Ï£Íû´ó¼Ò¹Ø×¢[ À´×Ô¿ÆÑмÒ×å ´ÅÐÔ²ÄÁÏ ] |
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2012-09-24 15:16:06, 1.41 M
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