Orbital‐selective Mott transitions in the 2‐band J z ‐model: a high‐precision quantum Monte Carlo study

Orbital‐selective Mott transitions in the 2‐band J z ‐model: a high‐precision quantum Monte Carlo study
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2 带 J z 模型中的轨道选择性莫特跃迁:高精度量子蒙特卡罗研究

DOI:
10.1002/pssb.200562449
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发表时间:
2005
期刊:
physica status solidi (b)
影响因子:
--
通讯作者:
N. Blümer
N. Blümer
中科院分区:
--
文献类型:
--
作者:
P. van Dongen;C. Knecht;N. Blümer

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在动力学平均场理论(DMFT)的框架下,利用高精度量子蒙特卡罗(QMC)模拟,我们证明了各向异性退化两轨道Hubbard模型包含两个连续的轨道选择性Mott跃迁(osmt),即使在没有自旋翻转项和对跳变过程的情况下。为了揭示二次跃迁,我们仔细分析了自能的低频部分和局域谱函数。这篇论文将我们以前的工作扩展到更低的温度。我们讨论了两个Mott转换的性质,特别是顺序,并列出了各种可能的扩展。(©2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Using high‐precision quantum Monte Carlo (QMC) simulations within the framework of dynamical mean field theory (DMFT), we show that the anisotropic degenerate two‐orbital Hubbard model contains two consecutive orbital‐selective Mott transitions (OSMTs) even in the absence of spin‐flip terms and pair‐hopping processes. In order to reveal the second transition we carefully analyze the low‐frequency part of the self‐energy and the local spectral functions. This paper extends our previous work to lower temperatures. We discuss the nature – in particular the order – of both Mott transitions and list various possible extensions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
DOI: 10.1103/physrevlett.84.2666
发表时间: 2000-03-20
影响因子: 8.6
作者:
Nakatsuji, S;Maeno, Y
通讯作者: Maeno, Y