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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)2588-2591
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume42
Issue number10
DOIs
Publication statusPublished - 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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