Supersolid phases in the one-dimensional extended soft-core bosonic Hubbard model
Supersolid phases in the one-dimensional extended soft-core bosonic Hubbard model
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DOI：
10.1103/physrevlett.97.087209
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发表时间：
2006-08-25
影响因子：
8.6
通讯作者：
Scalettar, R. T.
中科院分区：
文献类型：
--
作者：
Batrouni, G. G.;Herbert, F.;Scalettar, R. T.
我们目前的软核扩展玻色子哈伯德模型在一维表现出的超固相的存在下，最近发现在二维的量子Monte Carlo模拟的结果。我们发现，在一维和二维中，绝缘体-超固体相变的动力学临界指数z=2，而二维中的一阶绝缘体-超流体相变则被一维中z=1的连续相变所取代。我们提供证据表明这种转变属于Kosterlitz-Thouless普适性类，并讨论了这种差异背后的机制。同时存在的两种类型的准长程有序的结果在两个孤立子的激发光谱的下降。
We present results of quantum Monte Carlo simulations for the soft-core extended bosonic Hubbard model in one dimension exhibiting the presence of supersolid phases similar to those recently found in two dimensions. We find that in one and two dimensions, the insulator-supersolid transition has dynamic critical exponent z=2 whereas the first order insulator-superfluid transition in two dimensions is replaced by a continuous transition with z=1 in one dimension. We present evidence that this transition is in the Kosterlitz-Thouless universality class and discuss the mechanism behind this difference. The simultaneous presence of two types of quasi-long-range order results in two solitonlike dips in the excitation spectrum.