Gate adjustable coherent three and four level mixing in a vertical quantum dot molecule

C. Payette; S. Amaha; T. Hatano; K. Ono; J. A. Gupta; G. C. Aers; D. G. Austing; S. V. Nair; S. Tarucha

doi:10.1016/j.physe.2010.04.006

Gate adjustable coherent three and four level mixing in a vertical quantum dot molecule

C. Payette, S. Amaha, T. Hatano, K. Ono, J. A. Gupta, G. C. Aers, D. G. Austing, S. V. Nair, S. Tarucha

SCI - Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We study level mixing in the single-particle energy spectrum of one of the constituent quantum dots in a vertical double quantum dot by performing magneto-resonant-tunneling spectroscopy. The device used in this study differs from previous vertical double quantum dot devices in that the single side gate is now split into four separate gates. Because of the presence of natural perturbations caused by anharmonicity and anisotropy, applying different combinations of voltages to these gates allows us to alter the effective potential landscape of the two dots and hence influence the level mixing. We present here preliminary results from one three level crossing and one four level crossing high up in the energy spectrum of one of the probed quantum dots, and demonstrate that we are able to change significantly the energy dispersions with magnetic field in the vicinity of the crossing regions.

Original language	English
Pages (from-to)	2588-2591
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	42
Issue number	10
DOIs	https://doi.org/10.1016/j.physe.2010.04.006
Publication status	Published - 2010 Sep

Keywords

Coupled quantum dots
Energy level mixing
Magneto-resonant-tunneling spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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Gate adjustable coherent three and four level mixing in a vertical quantum dot molecule. / Payette, C.; Amaha, S.; Hatano, T.; Ono, K.; Gupta, J. A.; Aers, G. C.; Austing, D. G.; Nair, S. V.; Tarucha, S.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 42, No. 10, 09.2010, p. 2588-2591.

Research output: Contribution to journal › Article › peer-review

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title = "Gate adjustable coherent three and four level mixing in a vertical quantum dot molecule",

abstract = "We study level mixing in the single-particle energy spectrum of one of the constituent quantum dots in a vertical double quantum dot by performing magneto-resonant-tunneling spectroscopy. The device used in this study differs from previous vertical double quantum dot devices in that the single side gate is now split into four separate gates. Because of the presence of natural perturbations caused by anharmonicity and anisotropy, applying different combinations of voltages to these gates allows us to alter the effective potential landscape of the two dots and hence influence the level mixing. We present here preliminary results from one three level crossing and one four level crossing high up in the energy spectrum of one of the probed quantum dots, and demonstrate that we are able to change significantly the energy dispersions with magnetic field in the vicinity of the crossing regions.",

keywords = "Coupled quantum dots, Energy level mixing, Magneto-resonant-tunneling spectroscopy",

author = "C. Payette and S. Amaha and T. Hatano and K. Ono and Gupta, {J. A.} and Aers, {G. C.} and Austing, {D. G.} and Nair, {S. V.} and S. Tarucha",

note = "Funding Information: The authors thank B. Partoens, T. Kubo, Y. Kitamura, S. Teraoka, Y. Tokura and M. Hilke for help and discussions. Part of this work is supported by NSERC (Discovery Grant 208201), Grants-in-Aid for Scientific Research S (no. 19104007), B (no. 18340081), and by Special Coordination Funds for Promoting Science and Technology. S.T. acknowledges support from QuEST program (BAA-0824). ",

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AU - Payette, C.

AU - Amaha, S.

AU - Hatano, T.

AU - Ono, K.

AU - Gupta, J. A.

AU - Aers, G. C.

AU - Austing, D. G.

AU - Nair, S. V.

AU - Tarucha, S.

N1 - Funding Information: The authors thank B. Partoens, T. Kubo, Y. Kitamura, S. Teraoka, Y. Tokura and M. Hilke for help and discussions. Part of this work is supported by NSERC (Discovery Grant 208201), Grants-in-Aid for Scientific Research S (no. 19104007), B (no. 18340081), and by Special Coordination Funds for Promoting Science and Technology. S.T. acknowledges support from QuEST program (BAA-0824).

PY - 2010/9

Y1 - 2010/9

N2 - We study level mixing in the single-particle energy spectrum of one of the constituent quantum dots in a vertical double quantum dot by performing magneto-resonant-tunneling spectroscopy. The device used in this study differs from previous vertical double quantum dot devices in that the single side gate is now split into four separate gates. Because of the presence of natural perturbations caused by anharmonicity and anisotropy, applying different combinations of voltages to these gates allows us to alter the effective potential landscape of the two dots and hence influence the level mixing. We present here preliminary results from one three level crossing and one four level crossing high up in the energy spectrum of one of the probed quantum dots, and demonstrate that we are able to change significantly the energy dispersions with magnetic field in the vicinity of the crossing regions.

AB - We study level mixing in the single-particle energy spectrum of one of the constituent quantum dots in a vertical double quantum dot by performing magneto-resonant-tunneling spectroscopy. The device used in this study differs from previous vertical double quantum dot devices in that the single side gate is now split into four separate gates. Because of the presence of natural perturbations caused by anharmonicity and anisotropy, applying different combinations of voltages to these gates allows us to alter the effective potential landscape of the two dots and hence influence the level mixing. We present here preliminary results from one three level crossing and one four level crossing high up in the energy spectrum of one of the probed quantum dots, and demonstrate that we are able to change significantly the energy dispersions with magnetic field in the vicinity of the crossing regions.

KW - Coupled quantum dots

KW - Energy level mixing

KW - Magneto-resonant-tunneling spectroscopy

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