Electron transport through double quantum dots

Details Electron transport through double quantum dots Electron transport through double quantum dots

2002-05-16

arxiv.org/abs/cond-mat/0205350v2

Rev. Mod. Phys. Vol. 75 No. 1, 1-22 (2003).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

32 pages, 31 figures

Scientific paper

10.1103/RevModPhys.75.1

Electron transport experiments on two lateral quantum dots coupled in series are reviewed. An introduction to the charge stability diagram is given in terms of the electrochemical potentials of both dots. Resonant tunneling experiments show that the double dot geometry allows for an accurate determination of the intrinsic lifetime of discrete energy states in quantum dots. The evolution of discrete energy levels in magnetic field is studied. The resolution allows to resolve avoided crossings in the spectrum of a quantum dot. With microwave spectroscopy it is possible to probe the transition from ionic bonding (for weak inter-dot tunnel coupling) to covalent bonding (for strong inter-dot tunnel coupling) in a double dot artificial molecule. This review on the present experimental status of double quantum dot studies is motivated by their relevance for realizing solid state quantum bits.

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