Metal–insulator transition in quantum dot arrays

Shailos, A.; Hassan, Mohammad; Prasad, C.; Bird, Jonathan P.; Ferry, D. K.; Lin, Li-Hung; Aoki, Nobuyuki; Nakao, Kenji; Ochiai, Y.; Ishibashi, Koji; Aoyagi, Yoshinobu; Sugano, Takuo

doi:10.1006/spmi.2000.0832

Cited by 2 publications

(3 citation statements)

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“…While we only show results for two specific cases here, we emphasize that similar behaviour is found in temperature-dependent studies of other local conductance maxima or minima [42]. We find the amplitude of the logarithmic term to be quite similar in both the metallic and insulating states, and to be largely insensitive to the application of a magnetic field [43]. We also find that the magnitude of this term is larger in arrays of smaller dots and that no evidence for this term is present in measurements performed with the gates of the arrays grounded [43].…”

Section: 'Metal-insulator' Transition In Quantum Dot Arrayssupporting

confidence: 80%

“…We also find that the magnitude of this term is larger in arrays of smaller dots and that no evidence for this term is present in measurements performed with the gates of the arrays grounded [43]. For these reasons, we have suggested that the logarithmic term results from a confinement-induced enhancement of electron-electron interactions in the arrays [42,43]. While theoretical studies are called for to clarify the origin of this unexpected logarithmic variation, the interesting possibility is that this term provides a novel signature of electroninteraction effects in confined nanostructure devices.…”

Section: 'Metal-insulator' Transition In Quantum Dot Arraysmentioning

confidence: 59%

“…We find the amplitude of the logarithmic term to be quite similar in both the metallic and insulating states, and to be largely insensitive to the application of a magnetic field [43]. We also find that the magnitude of this term is larger in arrays of smaller dots and that no evidence for this term is present in measurements performed with the gates of the arrays grounded [43]. For these reasons, we have suggested that the logarithmic term results from a confinement-induced enhancement of electron-electron interactions in the arrays [42,43].…”

Section: 'Metal-insulator' Transition In Quantum Dot Arraysmentioning

confidence: 84%

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Signatures of coherent electron transport in open quantum dot arrays

et al. 2000

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We discuss the results of experimental studies of coherent electron transport in open quantum dot arrays. These studies suggest that the details of this transport remain highly phase coherent over much of the array, allowing features associated with the quantum mechanical coupling of the dots to be observed. Studies of magneto-conductance oscillations in the arrays appear to show the influence of this coupling through a change in frequency content as their gate voltage is varied. We speculate that this change arises as the contribution to interference of long orbits is suppressed by reducing the strength of the inter-dot coupling. Temperature-dependent studies of these devices reveal evidence for an unexpected `metal-insulator' transition, which is manifest as a logarithmic variation of the conductance at low temperatures, whose sign can correspond to either metallic or insulating behaviour. It is speculated that this logarithmic term provides a novel signature of electron-interaction effects in confined nanostructure devices.

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Section: 'Metal-insulator' Transition In Quantum Dot Arrayssupporting

confidence: 80%