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arXiv 2102.00307cond-mat.stat-mech
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一维系统的负温傅里叶输运

Negative-temperature Fourier transport in one-dimensional systems

Marco Baldovin, Stefano Iubini

摘要:

研究了一类具有负绝对温度的一维扩散系统的非平衡稳态。考虑了顺磁自旋系统、哈密顿转动链和一维离散线性薛定谔方程的情形。实施合适的储层模型以在链端处施加给定的(可能为负的)温度。我们表明,傅立叶定律的现象学描述可以始终如一地描述不寻常的运输制度的温度分布是完全或部分在负温度区域。负温度傅立叶输运观察确定性和随机动力学,它可以推广到耦合输运时,两个或两个以上的热力学电流流过系统。

英文摘要:

We investigate nonequilibrium steady states in a class of one-dimensional diffusive systems that can attain negative absolute temperatures. The cases of a paramagnetic spin system, a Hamiltonian rotator chain and a one-dimensional discrete linear Schrödinger equation are considered. Suitable models of reservoirs are implemented to impose given, possibly negative, temperatures at the chain ends. We show that a phenomenological description in terms of a Fourier law can consistently describe unusual transport regimes where the temperature profiles are entirely or partially in the negative-temperature region. Negative-temperature Fourier transport is observed both for deterministic and stochastic dynamics and it can be generalized to coupled transport when two or more thermodynamic currents flow through the system.

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