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arXiv 0904.3889cond-mat.quant-gascond-mat.supr-conhep-ph
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磁振子BEC和自旋超流性:~ 3 He引论

Magnon BEC and Spin Superfluidity: a 3He primer

Yu. M. Bunkov, G. E. Volovik

摘要:

玻色-爱因斯坦凝聚(BEC)是一种形成集体量子态的量子现象,其中宏观数量的粒子占据最低能态,因此受单个波函数支配。在这里,我们强调的BEC在磁子系统-磁振子的BEC,基本磁激发。磁振子BEC表现为旋进自旋的自发涌现态,其中所有自旋即使在非均匀磁场中也以相同的频率和相位旋进。我们以$^3$ He超流相的自旋旋进为例来考虑这种现象。这些相中的磁振子BEC具有自旋超流性的所有性质。相位相干旋进态属于相干量子态的范畴,它通过超流、超导、量子霍尔效应、约瑟夫森效应等宏观量子现象表现出来。

英文摘要:

Bose-Einstein condensation (BEC) is a quantum phenomenon of formation of the collective quantum state, in which the macroscopic number of particles occupies the lowest energy state and thus is governed by a single wave function. Here we highlight the BEC in a magnetic subsystem -- the BEC of magnons, elementary magnetic excitations. Magnon BEC is manifested as the spontaneously emerging state of the precessing spins, in which all spins precess with the same frequency and phase even in the inhomogeneous magnetic field. We consider this phenomenon on example of spin precession in superfluid phases of $^3$He. The magnon BEC in these phases has all the properties of spin superfluidity. The states of the phase-coherent precession belong to the class of the coherent quantum states, which manifest themselves by superfluidity, superconductivity, quantum Hall effect, Josephson effect and many other macroscopic quantum phenomena.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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