Mott transitions in the multi-orbital systems

被引：23

作者：

Koga, A

Kawakami, N

Rice, TM

Sigrist, M

机构：

[1] Osaka Univ, Dept Appl Phys, Suita, Osaka 5650871, Japan

[2] ETH Honggerberg, CH-8093 Zurich, Switzerland

来源：

PHYSICA B-CONDENSED MATTER | 2005年 / 359卷

关键词：

Mott transition; Hubbard model; Hund coupling;

D O I：

10.1016/j.physb.2005.01.414

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate the Mott transitions in the two-orbital Hubbard model with different bandwidths. By combining dynamical mean field theory with the exact diagonalization, we discuss the stability of itinerant quasi-particle states in each band. We demonstrate that separate Mott transitions occur at different Coulomb interaction strengths in general, which merge to a single transition only under special conditions. In particular, it is clarified that the xy and pair-hopping components of the Hund coupling play a key role to control the nature of the Mott transitions. (c) 2005 Elsevier B.V. All rights reserved.

引用

收藏

页码：1366 / 1368

页数：3

相关论文

共 28 条

[1] Orbital-selective Mott-insulator transition in Ca2-xSrxRuO4 [J].

Anisimov, VI ;

Nekrasov, IA ;

Kondakov, DE ;

Rice, TM ;

Sigrist, M .

EUROPEAN PHYSICAL JOURNAL B, 2002, 25 (02) :191-201

[2] EXACT DIAGONALIZATION APPROACH TO CORRELATED FERMIONS IN INFINITE DIMENSIONS - MOTT TRANSITION AND SUPERCONDUCTIVITY [J].

CAFFAREL, M ;

KRAUTH, W .

PHYSICAL REVIEW LETTERS, 1994, 72 (10) :1545-1548

[3] Orbital-dependent phase control in Ca2-xSrxRuO4 (0≤x≤0.5) [J].

Fang, Z ;

Nagaosa, N ;

Terakura, K .

PHYSICAL REVIEW B, 2004, 69 (04)

[4] Magnetic phase diagram of Ca2-xSrxRuO4 governed by structural distortions -: art. no. 020509 [J].

Fang, Z ;

Terakura, K .

PHYSICAL REVIEW B, 2001, 64 (02)

[5] Dynamical mean-field theory of strongly correlated fermion systems and the limit of infinite dimensions [J].

Georges, A ;

Kotliar, G ;

Krauth, W ;

Rozenberg, MJ .

REVIEWS OF MODERN PHYSICS, 1996, 68 (01) :13-125

[6] Multiorbital Hubbard model in infinite dimensions: Quantum Monte Carlo calculation [J].

Han, JE ;

Jarrell, M ;

Cox, DL .

PHYSICAL REVIEW B, 1998, 58 (08) :R4199-R4202

[7] Microscopic conditions favoring itinerant ferromagnetism: Hund's rule coupling and orbital degeneracy [J].

Held, K ;

Vollhardt, D .

EUROPEAN PHYSICAL JOURNAL B, 1998, 5 (03) :473-478

[8] Heavy quasi-particles in the two-orbital Hubbard model [J].

Imai, Y ;

Kawakami, N .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2001, 70 (08) :2365-2370

[9] Transport and magnetic properties of La3Ni2O7-delta and La4Ni3O10-delta [J].

Kobayashi, Y ;

Taniguchi, S ;

Kasai, M ;

Sato, M ;

Nishioka, T ;

Kontani, M .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (12) :3978-3982

[10] Orbital-selective Mott transitions in the degenerate Hubbard model [J].

Koga, A ;

Kawakami, N ;

Rice, TM ;

Sigrist, M .

PHYSICAL REVIEW LETTERS, 2004, 92 (21) :216402-1