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arXiv 1807.00428nlin.SIcond-mat.supr-conmath-phmath.MP
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开和闭$p+ip$配对模型的基态能量

Ground-state energies of the open and closed $p+ip$-pairing models from the Bethe Ansatz

Yibing Shen, Phillip S. Isaac, Jon Links

摘要:

利用精确的Bethe Anglesian解,我们研究了计算$p + ip$配对哈密顿量的基态能量的方法。我们首先考虑从它的环境(封闭模型)通过两种形式的Bethe Anesthesia解决方案,这通常有复值Bethe根孤立的哈密顿。一个连续极限近似,导致一个积分方程,应用计算的基态能量。我们讨论了根分布曲线的演变相对于一系列的参数,这种方法的局限性。然后,我们考虑另一种方法,将贝特Anglomerate方程的等价形式,但在实值保守的运营商特征值。对变换后的解建立了积分方程。这个方程被证明承认与基态的精确解。接下来,我们讨论最近派生的开放模型的Bethe Anglands解决方案的结果。与上述替代方法的基础上实值根,结合平均场分析,我们能够建立一个积分方程的精确解,对应于这种情况下的基态。

英文摘要:

Using the exact Bethe Ansatz solution, we investigate methods for calculating the ground-state energy for the $p + ip$-pairing Hamiltonian. We first consider the Hamiltonian isolated from its environment (closed model) through two forms of Bethe Ansatz solutions, which generally have complex-valued Bethe roots. A continuum limit approximation, leading to an integral equation, is applied to compute the ground-state energy. We discuss the evolution of the root distribution curve with respect to a range of parameters, and the limitations of this method. We then consider an alternative approach that transforms the Bethe Ansatz equations to an equivalent form, but in terms of the real-valued conserved operator eigenvalues. An integral equation is established for the transformed solution. This equation is shown to admit an exact solution associated with the ground state. Next we discuss results for a recently derived Bethe Ansatz solution of the open model. With the aforementioned alternative approach based on real-valued roots, combined with mean-field analysis, we are able to establish an integral equation with an exact solution that corresponds to the ground-state for this case.

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