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Microwave spectroscopy of a quantum-dot molecule

Author

Listed:
  • T. H. Oosterkamp

    (Delft University of Technology)

  • T. Fujisawa

    (Delft University of Technology
    NTT Basic Research Laboratories)

  • W. G. van der Wiel

    (Delft University of Technology)

  • K. Ishibashi

    (Delft University of Technology
    Institute of Physical and Chemical Research (RIKEN))

  • R. V. Hijman

    (Delft University of Technology)

  • S. Tarucha

    (NTT Basic Research Laboratories)

  • L. P. Kouwenhoven

    (Delft University of Technology)

Abstract

Quantum dots are small conductive regions in a semiconductor, containing a variable number of electrons (from one to a thousand) that occupy well-defined, discrete quantum states—for which reason they are often referred to as artificial atoms1. Connecting them to current and voltage contacts allows the discrete energy spectra to be probed by charge-transport measurements. Two quantum dots can be connected to form an ‘artificial molecule’. Depending on the strength of the inter-dot coupling (which supports quantum-mechanical tunnelling of electrons between the dots), the two dots can form ‘ionic’ (26) or ‘covalent’ bonds. In the former case, the electrons are localized on individual dots, while in the latter, the electrons are delocalized over both dots. The covalent binding leads to bonding and antibonding states, whose energy difference is proportional to the degree of tunnelling. Here we report a transition from ionic bonding to covalent bonding in a quantum-dot ‘artificial molecule’ that is probed by microwave excitations5,6,7,8. Our results demonstrate controllable quantum coherence in single-electron devices, an essential requirement for practical applications of quantum-dot circuitry.

Suggested Citation

  • T. H. Oosterkamp & T. Fujisawa & W. G. van der Wiel & K. Ishibashi & R. V. Hijman & S. Tarucha & L. P. Kouwenhoven, 1998. "Microwave spectroscopy of a quantum-dot molecule," Nature, Nature, vol. 395(6705), pages 873-876, October.
    • Handle: RePEc:nat:nature:v:395:y:1998:i:6705:d:10.1038_27617
    DOI: 10.1038/27617
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    Cited by:

    1. K. Hecker & L. Banszerus & A. Schäpers & S. Möller & A. Peters & E. Icking & K. Watanabe & T. Taniguchi & C. Volk & C. Stampfer, 2023. "Coherent charge oscillations in a bilayer graphene double quantum dot," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Xiao-Feng Zhou & Yu-Chen Zhuang & Mo-Han Zhang & Hao Sheng & Qing-Feng Sun & Lin He, 2024. "Relativistic artificial molecule of two coupled graphene quantum dots at tunable distances," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Xiqiao Wang & Ehsan Khatami & Fan Fei & Jonathan Wyrick & Pradeep Namboodiri & Ranjit Kashid & Albert F. Rigosi & Garnett Bryant & Richard Silver, 2022. "Experimental realization of an extended Fermi-Hubbard model using a 2D lattice of dopant-based quantum dots," Nature Communications, Nature, vol. 13(1), pages 1-12, December.

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