Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot

被引：13

作者：

Biesinger, D. E. F. ^{[1
]}

Scheller, C. P. ^{[1
,2
]}

Braunecker, B. ^{[3
]}

Zimmerman, J. ^{[4
]}

Gossard, A. C. ^{[4
]}

Zumbuehl, D. M. ^{[1
]}

机构：

[1] Univ Basel, Dept Phys, CH-4056 Basel, Switzerland

[2] EMPA, Swiss Fed Labs Mat Sci & Technol, CH-8600 Dubendorf, Switzerland

[3] Univ St Andrews, Sch Phys & Astron, Scottish Univ Phys Alliance, St Andrews KY16 9SS, Fife, Scotland

[4] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 10期

基金：

瑞士国家科学基金会; 欧盟第七框架计划; 欧洲研究理事会; 芬兰科学院;

关键词：

COHERENT CONTROL; ELECTRON-SPIN;

D O I：

10.1103/PhysRevLett.115.106804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a thermally activated metastability in a GaAs double quantum dot exhibiting real-time charge switching in diamond shaped regions of the charge stability diagram. Accidental charge traps and sensor backaction are excluded as the origin of the switching. We present an extension of the canonical double dot theory based on an intrinsic, thermal electron exchange process through the reservoirs, giving excellent agreement with the experiment. The electron spin is randomized by the exchange process, thus facilitating fast, gate-controlled spin initialization. At the same time, this process sets an intrinsic upper limit to the spin relaxation time.

引用

页数：6

共 44 条

[1] Electrical control of spin relaxation in a quantum dot [J].

Amasha, S. ;

MacLean, K. ;

Radu, Iuliana P. ;

Zumbuehl, D. M. ;

Kastner, M. A. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW LETTERS, 2008, 100 (04)

[2] Spin-dependent tunneling of single electrons into an empty quantum dot [J].

Amasha, S. ;

MacLean, K. ;

Radu, Iuliana P. ;

Zumbuehl, D. M. ;

Kastner, M. A. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW B, 2008, 78 (04)

[3] Fast sensing of double-dot charge arrangement and spin state with a radio-frequency sensor quantum dot [J].

Barthel, C. ;

Kjaergaard, M. ;

Medford, J. ;

Stopa, M. ;

Marcus, C. M. ;

Hanson, M. P. ;

Gossard, A. C. .

PHYSICAL REVIEW B, 2010, 81 (16)

[4] Dephasing time of GaAs electron-spin qubits coupled to a nuclear bath exceeding 200 μs [J].

Bluhm, Hendrik ;

Foletti, Sandra ;

Neder, Izhar ;

Rudner, Mark ;

Mahalu, Diana ;

Umansky, Vladimir ;

Yacoby, Amir .

NATURE PHYSICS, 2011, 7 (02) :109-113

[5] Photon- and phonon-assisted tunneling in the three-dimensional charge stability diagram of a triple quantum dot array [J].

Braakman, Floris R. ;

Barthelemy, Pierre ;

Reichl, Christian ;

Wegscheider, Werner ;

Vandersypen, Lieven M. K. .

APPLIED PHYSICS LETTERS, 2013, 102 (11)

[6] Two-Qubit Gate of Combined Single-Spin Rotation and Interdot Spin Exchange in a Double Quantum Dot [J].

Brunner, R. ;

Shin, Y. -S. ;

Obata, T. ;

Pioro-Ladriere, M. ;

Kubo, T. ;

Yoshida, K. ;

Taniyama, T. ;

Tokura, Y. ;

Tarucha, S. .

PHYSICAL REVIEW LETTERS, 2011, 107 (14)

[7] InSitu Reduction of Charge Noise in GaAs/AlxGa1-xAs Schottky-Gated Devices [J].

Buizert, Christo ;

Koppens, Frank H. L. ;

Pioro-Ladriere, Michel ;

Tranitz, Hans-Peter ;

Vink, Ivo T. ;

Tarucha, Seigo ;

Wegscheider, Werner ;

Vandersypen, Lieven M. K. .

PHYSICAL REVIEW LETTERS, 2008, 101 (22)

[8] Metallic Coulomb blockade thermometry down to 10 mK and below [J].

Casparis, L. ;

Meschke, M. ;

Maradan, D. ;

Clark, A. C. ;

Scheller, C. P. ;

Schwarzwaelder, K. K. ;

Pekola, J. P. ;

Zumbuehl, D. M. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2012, 83 (08)

[9] Method for cooling nanostructures to microkelvin temperatures [J].

Clark, A. C. ;

Schwarzwaelder, K. K. ;

Bandi, T. ;

Maradan, D. ;

Zumbuehl, D. M. .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2010, 81 (10)

[10] Charge Noise Spectroscopy Using Coherent Exchange Oscillations in a Singlet-Triplet Qubit [J].

Dial, O. E. ;

Shulman, M. D. ;

Harvey, S. P. ;

Bluhm, H. ;

Umansky, V. ;

Yacoby, A. .

PHYSICAL REVIEW LETTERS, 2013, 110 (14)

← 1 2 3 4 5 →