COULOMB-BLOCKADE AND CONDUCTANCE OSCILLATIONS IN A QUANTUM-DOT

被引：4

作者：

PERSSON, M ^{[1
]}

PETTERSSON, J ^{[1
]}

KRISTENSEN, A ^{[1
]}

LINDELOF, PE ^{[1
]}

机构：

[1] UNIV COPENHAGEN,NIELS BOHR INST,ORSTED LAB,DK-2100 COPENHAGEN,DENMARK

来源：

PHYSICA B | 1994年 / 194卷 / pt 1期

关键词：

D O I：

10.1016/0921-4526(94)90966-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied conductance oscillations of a quantum dot by varying the gate potential of one of the gate pairs, that forms the quantum dot, while the other pair was kept at a constant potential. The potential was varied from pinch-off to a level where two or more transverse modes were transmitted through the quantum point contact (QPC). We observed well-pronounced Coulomb-blockade (CB) oscillations when the conductivity of both point contacts was less than 2e2/h. When one QPC was more transparent, conductance oscillations with longer period were observed. The longer period decreased with magnetic field, whereas the short period appeared to be constant. Both oscillations were observed simultaneously at high magnetic fields, even when the conductivity of one QPC was higher than 2e2/h. The conductance oscillations can be explained by charging effects and a variation of tunnel-probability to different Landau levels in the dot.

引用

页码：1273 / 1274

页数：2

共 5 条

[1] ZERO-DIMENSIONAL STATES AND SINGLE ELECTRON CHARGING IN QUANTUM DOTS [J].

JOHNSON, AT ;

KOUWENHOVEN, LP ;

DEJONG, W ;

VANDERVAART, NC ;

HARMANS, CJPM ;

FOXON, CT .

PHYSICAL REVIEW LETTERS, 1992, 69 (10) :1592-1595

[2] SELF-CONSISTENT ADDITION SPECTRUM OF A COULOMB ISLAND IN THE QUANTUM HALL REGIME [J].

MCEUEN, PL ;

FOXMAN, EB ;

KINARET, J ;

MEIRAV, U ;

KASTNER, MA ;

WINGREEN, NS ;

WIND, SJ .

PHYSICAL REVIEW B, 1992, 45 (19) :11419-11422

[3] CONDUCTANCE OSCILLATIONS AND TRANSPORT SPECTROSCOPY OF A QUANTUM DOT [J].

MEIRAV, U ;

MCEUEN, PL ;

KASTNER, MA ;

FOXMAN, EB ;

KUMAR, A ;

WIND, SJ .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1991, 85 (03) :357-366

[4] QUANTUM LIMITATION ON COULOMB BLOCKADE OBSERVED IN A 2D ELECTRON-SYSTEM [J].

PASQUIER, C ;

MEIRAV, U ;

WILLIAMS, FIB ;

GLATTLI, DC ;

JIN, Y ;

ETIENNE, B .

PHYSICAL REVIEW LETTERS, 1993, 70 (01) :69-72

[5] PERIODIC ENVELOPE OF COULOMB-BLOCKADE OSCILLATIONS IN THE QUANTUM HALL REGIME [J].

STARING, AAM ;

ALPHENAAR, BW ;

VANHOUTEN, H ;

MOLENKAMP, LW ;

BUYK, OJA ;

MABESOONE, MAA ;

FOXON, CT .

PHYSICAL REVIEW B, 1992, 46 (19) :12869-12872

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