Observation of excited states in a p-type GaAs quantum dot

被引：15

作者：

Komijani, Y. ^{[1
]}

Csontos, M. ^{[1
]}

Ihn, T. ^{[1
]}

Ensslin, K. ^{[1
]}

Reuter, D. ^{[2
]}

Wieck, A. D. ^{[2
]}

机构：

[1] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

[2] Ruhr Univ Bochum, Angew Festkorperphys, D-44780 Bochum, Germany

来源：

EPL | 2008年 / 84卷 / 05期

基金：

瑞士国家科学基金会;

关键词：

D O I：

10.1209/0295-5075/84/57004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A quantum dot fabricated by scanning probe oxidation lithography on a p-type, C-doped GaAs/AlGaAs heterostructure is investigated by low-temperature electrical conductance measurements. Clear Coulomb blockade oscillations are observed and analyzed in terms of sequential tunneling through the single-particle levels of the dot at T-hole = 185 mK. The charging energies as large as similar to 2 meV evaluated from Coulomb diamond measurements together with the well-resolved single-hole excited-state lines in the charge stability diagram indicate that the dot is operated with a small number of confined particles close to the ultimate single-hole regime. Copyright (C) EPLA, 2008

引用

页数：5

共 16 条

[1] THEORY OF COULOMB-BLOCKADE OSCILLATIONS IN THE CONDUCTANCE OF A QUANTUM DOT [J].

BEENAKKER, CWJ .

PHYSICAL REVIEW B, 1991, 44 (04) :1646-1656

[2] Spin relaxation and decoherence of holes in quantum dots [J].

Bulaev, DV ;

Loss, D .

PHYSICAL REVIEW LETTERS, 2005, 95 (07)

[3] Optical pumping of a single hole spin in a quantum dot [J].

Gerardot, Brian D. ;

Brunner, Daniel ;

Dalgarno, Paul A. ;

Ohberg, Patrik ;

Seidl, Stefan ;

Kroner, Martin ;

Karrai, Khaled ;

Stoltz, Nick G. ;

Petroff, Pierre M. ;

Warburton, Richard J. .

NATURE, 2008, 451 (7177) :441-444

[4]

Grbic B, 2005, APPL PHYS LETT, V87, DOI [10.1063/1.2139994, 10.1063/1.213994]

[5] Magnetotransport in C-doped AlGaAs heterostructures [J].

Grbic, B ;

Ellenberger, C ;

Ihn, T ;

Ensslin, K ;

Reuter, D ;

Wieck, AD .

APPLIED PHYSICS LETTERS, 2004, 85 (12) :2277-2279

[6] Spins in few-electron quantum dots [J].

Hanson, R. ;

Kouwenhoven, L. P. ;

Petta, J. R. ;

Tarucha, S. ;

Vandersypen, L. M. K. .

REVIEWS OF MODERN PHYSICS, 2007, 79 (04) :1217-1265

[7] In-plane gates and nanostructures fabricated by direct oxidation of semiconductor heterostructures with an atomic force microscope [J].

Held, R ;

Vancura, T ;

Heinzel, T ;

Ensslin, K ;

Holland, M ;

Wegscheider, W .

APPLIED PHYSICS LETTERS, 1998, 73 (02) :262-264

[8] Measurements of Kondo and spin splitting in single-electron transistors [J].

Kogan, A ;

Amasha, S ;

Goldhaber-Gordon, D ;

Granger, G ;

Kastner, MA ;

Shtrikman, H .

PHYSICAL REVIEW LETTERS, 2004, 93 (16) :166602-1

[9]

KOUWENHOVEN LP, 1997, P NATO ADV STUDY I E, V345, P105

[10] Quantum computation with quantum dots [J].

Loss, D ;

DiVincenzo, DP .

PHYSICAL REVIEW A, 1998, 57 (01) :120-126

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