Charged excitons in doped extended Hubbard model systems

被引：12

作者：

vandenBrink, J

Eder, R

Sawatzky, GA

机构：

[1] Lab. of Appl. and Solid Stt. Physics, Materials Science Centre, University of Groningen, Nijenborgh 4

来源：

EUROPHYSICS LETTERS | 1997年 / 37卷 / 07期

关键词：

D O I：

10.1209/epl/i1997-00174-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the charge transfer excitons in a Hubbard model system including nearest-neighbor Coulomb interactions effectively attain some charge in doped systems and become visible in photoelectron and inverse photoelectron spectroscopies. This shows that the description of a doped system by an extended Hubbard model differs substantially from that of a simple Hubbard model. Longer-range Coulomb interactions cause satellites in the one-electron removal and addition spectra and the appearance of spectral weight in the gap of doped systems at energies corresponding to the excitons of the undoped systems. The spectral weight of the satellites is proportional to the doping times the coordination number and therefore is strongly dependent on the dimension.

引用

收藏

页码：471 / 476

页数：6

相关论文

共 20 条

[1] C-1S AUTOIONIZATION STUDY OF ELECTRON HOPPING RATES IN SOLID C-60 [J].

BRUHWILER, PA ;

MAXWELL, AJ ;

RUDOLF, P ;

GUTLEBEN, CD ;

WASTBERG, B ;

MARTENSSON, N .

PHYSICAL REVIEW LETTERS, 1993, 71 (22) :3721-3724

[2] ELECTRONIC STATES AND PHASES OF KXC60 FROM PHOTOEMISSION AND X-RAY ABSORPTION-SPECTROSCOPY [J].

CHEN, CT ;

TJENG, LH ;

RUDOLF, P ;

MEIGS, G ;

ROWE, JE ;

CHEN, J ;

MCCAULEY, JP ;

SMITH, AB ;

MCGHIE, AR ;

ROMANOW, WJ ;

PLUMMER, EW .

NATURE, 1991, 352 (6336) :603-605

[3]

EDER R, 1995, PHYS REV B, V54, pR732

[4]

EMERY VJ, 1979, HIGHLY CONDUCTING ON

[5] ANOMALOUS TRANSFER OF SPECTRAL WEIGHT IN DOPED STRONGLY CORRELATED SYSTEMS [J].

ESKES, H ;

MEINDERS, MBJ ;

SAWATZKY, GA .

PHYSICAL REVIEW LETTERS, 1991, 67 (08) :1035-1038

[6] STRUCTURAL-ANALYSIS OF FULLERENE AND FULLERIDE SOLIDS FROM SYNCHROTRON X-RAY-POWDER DIFFRACTION [J].

FISCHER, JE ;

BENDELE, G ;

DINNEBIER, R ;

STEPHENS, PW ;

LIN, CL ;

BYKOVETZ, N ;

ZHU, Q .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1995, 56 (10) :1445-1457

[7] Plasmon dispersion and broadening in A(3)C(60) (A=K,Rb) [J].

Gunnarsson, O ;

Liechtenstein, AI ;

Eyert, V ;

Knupfer, M ;

Fink, J ;

Armbruster, JF .

PHYSICAL REVIEW B, 1996, 53 (06) :3455-3458

[8] CHARGE-DENSITY-WAVE TO SPIN-DENSITY-WAVE TRANSITION IN THE EXTENDED HUBBARD-MODEL [J].

HIRSCH, JE .

PHYSICAL REVIEW LETTERS, 1984, 53 (24) :2327-2330

[9] Excitons in C-60 studied by temperature-dependent optical second-harmonic generation [J].

Janner, AM ;

Eder, R ;

Koopmans, B ;

Jonkman, HT ;

Sawatzky, GA .

PHYSICAL REVIEW B, 1995, 52 (24) :17158-17164

[10] SATELLITES IN THE PHOTOEMISSION SPECTRA OF A3C60 (A = K AND RB) [J].

KNUPFER, M ;

MERKEL, M ;

GOLDEN, MS ;

FINK, J ;

GUNNARSSON, O ;

ANTROPOV, VP .

PHYSICAL REVIEW B, 1993, 47 (20) :13944-13947