MULTIORBITAL HUBBARD MODEL IN INFINITE DIMENSIONS : QUANTUM MONTE CARLO CALCULATION
MULTIORBITAL HUBBARD MODEL IN INFINITE DIMENSIONS : QUANTUM MONTE CARLO CALCULATION
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DOI：
10.1103/physrevb.58.r4199
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发表时间：
1998-06
影响因子：
3.7
通讯作者：
Jong E Han;M. Jarrell;D. Cox
中科院分区：
文献类型：
--
作者：
Jong E Han;M. Jarrell;D. Cox
利用量子蒙特卡罗方法计算了无限维轨道简并Hubbard模型的热力学和光谱。随着轨道简并度的增加，我们发现在单粒子光谱更广泛的哈伯德带（符合增加动能），缩小莫特间隙，并增加准粒子光谱重量。Hund{close_quote}规则交换耦合降低了Mott转变的临界在位库仑能。在低温下，双重简并的金属区电阻率与温度成二次关系。{版权} {美国物理学会}
Using the quantum Monte Carlo technique we compute thermodynamics and spectra for the orbitally degenerate Hubbard model in infinite spatial dimensions. With increasing orbital degeneracy we find in the one-particle spectra broader Hubbard bands (consistent with increased kinetic energy), a narrowing Mott gap, and increasing quasiparticle spectral weight. Hund{close_quote}s rule exchange coupling decreases the critical on-site Coulomb energy for the Mott transition. The metallic regime resistivity for twofold degeneracy is quadratic in temperature at low temperatures. {copyright} {ital 1998} {ital The American Physical Society}