Abstract

We report low-temperature tunneling measurements through double and triple quantum dots with adjustable interdot tunnel conductance, fabricated in a GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As heterostructure. As interdot tunnel conductance is increased, Coulomb blockade conductance peaks split into two peaks for double dots and three for triple dots. The splitting approaches zero for weak tunneling and saturates as the dots merge for strong tunneling. Coupled double and triple dots with different gate capacitance show quasiperiodic beating and peak suppression for weak interdot tunneling. Analysis of the data in terms of tunneling and classical charging theories shows that quantum charge fluctuations due to interdot tunneling dominate dot interactions when interdot tunnel conductance approaches 2${\mathit{e}}^{2}$/h. \textcopyright{} 1996 The American Physical Society.

Keywords

Quantum tunnellingPhysicsQuantum dotCondensed matter physicsCoulomb blockadeConductanceHeterojunctionTunnel effectCoulombQuasiperiodic functionCharge (physics)Quantum mechanicsElectronVoltage

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Year
1996
Type
article
Volume
53
Issue
3
Pages
1413-1420
Citations
133
Access
Closed

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F. R. Waugh, M. J. Berry, Catherine H. Crouch et al. (1996). Measuring interactions between tunnel-coupled quantum dots. Physical review. B, Condensed matter , 53 (3) , 1413-1420. https://doi.org/10.1103/physrevb.53.1413

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DOI
10.1103/physrevb.53.1413