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arXiv 0801.0299cond-mat.stat-mech
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长程相互作用对经典和量子固体稳定性的影响

The effect of long range interactions on the stability of classical and quantum solids

Debanjan Chowdhury, Amit Dutta

摘要:

我们推广了著名的Peierls的论点来研究长程相互作用的经典固体的稳定性。长程相互作用意味着所有的原子振子通过谐振势相互耦合,尽管耦合强度按照幂律$1/x^α$衰减,其中$x$是振子之间的距离。我们发现,对于范围参数$α<2$,长程相互作用占主导地位,一维系统保持一个结晶秩序,即使在有限的温度,而对于$α\geq2$,长程结晶秩序消失,即使在无限小的温度。我们还研究了量子涨落对一维固体在T=0时的熔化行为的影响,将Peierls的论点扩展到量子振荡器的情况。

英文摘要:

We generalise the celebrated Peierls' argument to study the stability of a long-range interacting classical solid. Long-range interaction implies that all the atomic oscillators are coupled to each other via a harmonic potential, though the coupling strength decays as a power-law $1/x^α$, where $x$ is the distance between the oscillators. We show that for the range parameter $α<2$, the long-range interaction dominates and the one-dimensional system retains a crystalline order even at a finite temperature whereas for $α\geq2$, the long-range crystalline order vanishes even at an infinitesimally small temperature. We also study the effect of quantum fluctuations on the melting behaviour of a one-dimensional solid at T=0, extending Peierls' arguments to the case of quantum oscillators.

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