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首页> 外文期刊>Physica, C. Superconductivity and its applications >Stability of the Gutzwiller projected BCS wavefunction in t-J bilayers: A variational Monte Carlo study
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Stability of the Gutzwiller projected BCS wavefunction in t-J bilayers: A variational Monte Carlo study

机译:t-J双层中Gutzwiller投影BCS波函数的稳定性:变分蒙特卡洛研究

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In this paper we investigate the stability of the Gutwiller projected BCS wavefunction on bilayered systems using the t-J model with a small but finite hopping amplitude and exchange coupling between the layers. Three possible pairing symmetries are proposed, viz. (a) a planar d(x2-y2)-wave, (b) a d(x2-y2)-wave plus an antisymmetric piece corresponding to the z-direction and (c) a d(x2-y2)-wave plus a partially antisymmetric piece corresponding to the ---direction. The energy minimization yields the pure d-wave to be the most suited wavefunction away from half filling. Further we have carried out a thorough study, elaborating the behaviour of optimal value of the variational parameter with hole doping and its dependence on the lattice size for different values of the interplanar parameters. The plots of optimal variational parameter versus hole concentration for the most stable wavefunction bear some interesting features, such as, a hump at small value of hole doping and a surprising dependence of critical doping (delta(c)) oil lattice size as the interplanar hopping parameter (t perpendicular to) is increased. The latter feature which is a rather interesting one, results from the changes in the energy band structure with lattice size and the interplanar hopping. (c) 2006 Elsevier B.V. All rights reserved.
机译:在本文中,我们使用t-J模型研究了Gutwiller投影BCS波函数在双层系统上的稳定性,该模型具有小但有限的跳跃幅度和层之间的交换耦合。提出了三种可能的配对对称性,即。 (a)平面d(x2-y2)波,(b)ad(x2-y2)波加上与z方向相对应的反对称零件,(c)ad(x2-y2)波加上部分与-方向相对应的非对称块。能量最小化使纯d波成为半填充以外最适合的波函数。进一步,我们进行了透彻的研究,详细阐述了带有空穴掺杂的变分参数最优值的行为及其对于平面间参数不同值对晶格尺寸的依赖性。最稳定的波函数的最佳变分参数与空穴浓度的关系图具有一些有趣的特征,例如,空穴掺杂值小时的驼峰和临界掺杂(delta(c))油晶格尺寸作为面内跳跃的令人惊讶的依赖性参数(垂直于t)增加。后一个特征是一个相当有趣的特征,它是由于能带结构随晶格大小和晶间跳变而产生的。 (c)2006 Elsevier B.V.保留所有权利。

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