Bose-Einstein condensation in an ultra-hot gas of pumped magnons

被引：110

作者：

Serga, Alexander A. ^{[1
]}

Tiberkevich, Vasil S. ^{[2
]}

Sandweg, Christian W. ^{[1
]}

Vasyuchka, Vitaliy I. ^{[1
]}

Bozhko, Dmytro A. ^{[1
,3
]}

Chumak, Andrii V. ^{[1
]}

Neumann, Timo ^{[1
]}

Obry, Bjoern ^{[1
]}

Melkov, Gennadii A. ^{[3
]}

Slavin, Andrei N. ^{[2
]}

Hillebrands, Burkard ^{[1
]}

机构：

[1] Tech Univ Kaiserslautern, Fachbereich Phys & Landesforschungszentrum OPTIMA, D-67663 Kaiserslautern, Germany

[2] Oakland Univ, Dept Phys, Rochester, MI 48309 USA

[3] Taras Shevchenko Natl Univ Kyiv, Fac Radiophys, UA-01601 Kiev, Ukraine

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

美国国家科学基金会;

关键词：

TEMPERATURE; SCATTERING;

D O I：

10.1038/ncomms4452

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Bose-Einstein condensation of quasi-particles such as excitons, polaritons, magnons and photons is a fascinating quantum mechanical phenomenon. Unlike the Bose-Einstein condensation of real particles (like atoms), these processes do not require low temperatures, since the high densities of low-energy quasi-particles needed for the condensate to form can be produced via external pumping. Here we demonstrate that such a pumping can create remarkably high effective temperatures in a narrow spectral region of the lowest energy states in a magnon gas, resulting in strikingly unexpected transitional dynamics of BoseEinstein magnon condensate: the density of the condensate increases immediately after the external magnon flow is switched off and initially decreases if it is switched on again. This behaviour finds explanation in a nonlinear 'evaporative supercooling' mechanism that couples the low-energy magnons overheated by pumping with all the other thermal magnons, removing the excess heat, and allowing Bose-Einstein condensate formation.

引用

页数：8

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