NEGATIVE DENSITY OF STATES OF A 2DEG IN THE ULTRAQUANTUM LIMIT

被引：5

作者：

DOROZHKIN, SI ^{[1
]}

HAUG, RJ ^{[1
]}

VONKLITZING, K ^{[1
]}

PLOOG, K ^{[1
]}

机构：

[1] RUSSIAN ACAD SCI,INST SOLID STATE PHYS,CHERNOGOLOVKA 142432,RUSSIA

来源：

PHYSICA B | 1993年 / 184卷 / 1-4期

关键词：

D O I：

10.1016/0921-4526(93)90372-D

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report observation of a negative thermodynamic density of states for two-dimensional electrons in GaAs/AlGaAs heterojunctions in the ultraquantum limit. The effect is most pronounced in the vicinity of filling factor v = 1 and v < 1/3. We simultaneously observe a metal-insulator transition which is found to occur at the same filling factor, v(c) congruent-to 0.28, in rather wide ranges of magnetic field and sample mobility. The negative thermodynamic density of states at v < 1/3 indicates the importance of the electron-electron interaction for this transition. The transition at zero magnetic field is observed to be sample-dependent.

引用

页码：314 / 317

页数：4

共 25 条

[1] OBSERVATION OF A MAGNETICALLY INDUCED WIGNER SOLID - REPLY [J].

ANDREI, EY ;

DEVILLE, G ;

GLATTLI, DC ;

WILLIAMS, FIB ;

PARIS, E ;

ETIENNE, B .

PHYSICAL REVIEW LETTERS, 1989, 62 (08) :973-973

[2] NOVEL MAGNETOOPTICAL BEHAVIOR IN THE WIGNER-SOLID REGIME [J].

BUHMANN, H ;

JOSS, W ;

VONKLITZING, K ;

KUKUSHKIN, IV ;

PLAUT, AS ;

MARTINEZ, G ;

PLOOG, K ;

TIMOFEEV, VB .

PHYSICAL REVIEW LETTERS, 1991, 66 (07) :926-929

[3] SOLID VERSUS FLUID, AND THE INTERPLAY BETWEEN FLUCTUATIONS, CORRELATIONS, AND EXCHANGE IN THE FRACTIONAL QUANTIZED HALL-EFFECT [J].

CHUI, ST ;

HAKIM, TM ;

MA, KB .

PHYSICAL REVIEW B, 1986, 33 (10) :7110-7121

[4]

DOLGFOPOLOV VT, 1992, JETP LETT, V55, P141

[5] HOMOGENEOUS AND INHOMOGENEOUS STATES OF A 2-DIMENSIONAL ELECTRON LIQUID IN A STRONG MAGNETIC-FIELD [J].

EFROS, AL .

PHYSICAL REVIEW B, 1992, 45 (19) :11354-11357

[6] DENSITY OF STATES OF 2D ELECTRON-GAS AND WIDTH OF THE PLATEAU OF IQHE [J].

EFROS, AL .

SOLID STATE COMMUNICATIONS, 1988, 65 (11) :1281-1284

[7]

EIKSENSTEIN JP, 1992, PHYS REV LETT, V68, P674

[8] EVIDENCE FOR THE FRACTIONAL QUANTUM HALL STATE AT V = 1/7 [J].

GOLDMAN, VJ ;

SHAYEGAN, M ;

TSUI, DC .

PHYSICAL REVIEW LETTERS, 1988, 61 (07) :881-884

[9] EVIDENCE FOR 2-DIMENSIONAL QUANTUM WIGNER CRYSTAL [J].

GOLDMAN, VJ ;

SANTOS, M ;

SHAYEGAN, M ;

CUNNINGHAM, JE .

PHYSICAL REVIEW LETTERS, 1990, 65 (17) :2189-2192

[10] CURRENT-CARRYING STATES IN THE LOWEST LANDAU-LEVEL [J].

HUO, Y ;

BHATT, RN .

PHYSICAL REVIEW LETTERS, 1992, 68 (09) :1375-1378

← 1 2 3 →