Fermi edge singularities in high magnetic fields

被引：14

作者：

Benedict, KA ^{[1
]}

Thornton, ASG ^{[1
]}

Ihn, T ^{[1
]}

Main, PC ^{[1
]}

Eaves, L ^{[1
]}

Henini, M ^{[1
]}

机构：

[1] Univ Nottingham, Dept Phys, Nottingham NG7 2RD, England

来源：

PHYSICA B-CONDENSED MATTER | 1998年 / 256卷

关键词：

quantum Hall effect; Fermi edge singularities; tunnelling;

D O I：

10.1016/S0921-4526(98)00562-6

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The current voltage characteristics of a single barrier tunnelling device which contains self-organized InAs quantum dots within the barrier are studied in zero and strong magnetic field conditions (both perpendicular and parallel to the interfaces). It is observed that in all cases there are large peaks whenever the energy of the bound state of a dot approaches the chemical potential of the 2d electron system formed at an interface. These are identified as thermally broadened Fermi-edge singularities which arise from many-body contributions to the tunnelling amplitude. We note that the standard theory of such singularities appears to work well in situations when the spin states of the dot are Zeeman split but is qualitatively incorrect in zero field. In the quantum Hall regime the peak height is an oscillatory function of magnetic field in agreement with theoretical predictions. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

引用

页码：519 / 522

页数：4

共 13 条

[1]

BENEDICT KA, UNPUB

[2]

BENEDICT KA, IN PRESS PHYSICA B

[3] FINITE-TEMPERATURE FERMI-EDGE SINGULARITY IN TUNNELING STUDIED USING RANDOM TELEGRAPH SIGNALS [J].

COBDEN, DH ;

MUZYKANTSKII, BA .

PHYSICAL REVIEW LETTERS, 1995, 75 (23) :4274-4277

[4] FERMI-EDGE SINGULARITY IN RESONANT-TUNNELING [J].

GEIM, AK ;

MAIN, PC ;

LASCALA, N ;

EAVES, L ;

FOSTER, TJ ;

BETON, PH ;

SAKAI, JW ;

SHEARD, FW ;

HENINI, M ;

HILL, G ;

PATE, MA .

PHYSICAL REVIEW LETTERS, 1994, 72 (13) :2061-2064

[5]

ISKEVICH IE, 1996, PHYS REV B, V54, P16401

[6] WEAK-LOCALIZATION EFFECTS IN A RESONANT-TUNNELING JUNCTION [J].

LERNER, IV ;

RAIKH, ME .

PHYSICAL REVIEW B, 1992, 45 (24) :14036-14041

[7] EXCITONS IN METALS - INFINITE HOLE MASS [J].

MAHAN, GD .

PHYSICAL REVIEW, 1967, 163 (03) :612-&

[8] INTERACTION-INDUCED THRESHOLD SINGULARITIES IN TUNNELING VIA LOCALIZED LEVELS [J].

MATVEEV, KA ;

LARKIN, AI .

PHYSICAL REVIEW B, 1992, 46 (23) :15337-15347

[9] SINGULARITIES IN X-RAY ABSORPTION AND EMISSION OF METALS .3. ONE-BODY THEORY EXACT SOLUTION [J].

NOZIERES, P ;

DEDOMINI.CT .

PHYSICAL REVIEW, 1969, 178 (03) :1097-&

[10] Observation of the local structure of Landau bands in a disordered conductor [J].

Schmidt, T ;

Haug, RJ ;

Falko, VI ;

vonKlitzing, K ;

Forster, A ;

Luth, H .

PHYSICAL REVIEW LETTERS, 1997, 78 (08) :1540-1543

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