EVOLUTION OF THE SPECTRAL-FUNCTION IN MOTT-HUBBARD SYSTEMS WITH D(1) CONFIGURATION
EVOLUTION OF THE SPECTRAL-FUNCTION IN MOTT-HUBBARD SYSTEMS WITH D(1) CONFIGURATION
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DOI：
10.1103/physrevlett.69.1796
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发表时间：
1992-09-21
影响因子：
8.6
通讯作者：
DEGROOT, FMF
中科院分区：
文献类型：
--
作者：
FUJIMORI, A;HASE, I;DEGROOT, FMF
我们研究了钙钛矿型Ti3+和V4+氧化物的光电子能谱，它们形式上具有从Mott绝缘体到顺磁性金属的D_1组态。结果表明，随着Mott-Hubbard带隙的关闭，谱权从上、下Hubbard带向费米能级附近转移，U/W(U，d-d库仑排斥能；W，单电子d带宽度)减小，即从单粒子谱函数的非相干部分转移到相干部分。
We have studied the photoemission spectra of perovskite-type Ti3+ and V4+ oxides, which have formally the d1 configuration ranging from a Mott insulator to a paramagnetic metal. The results indicate that as the Mott-Hubbard gap closes, spectral weight is transferred from the upper and lower Hubbard bands to the region near the Fermi level with decreasing U/W (U, d-d Coulomb repulsion energy; W, one-electron d-band width), i.e., from the incoherent to the coherent part of the single-particle spectral function.