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Quantum chaos in GaAs/AlxGa1-xAs microstructures

Publication ,  Conference
Chang, AM
Published in: Physica Scripta T
January 1, 2001

We review clear signatures of "quantum chaos" observable in both open and closed systems realized in GaAs/AlxGa1-xAs microstructures. In open ballistic billiards where scattering dynamics determine the characteristics of quantum transport, we find a striking difference in the shape of the negative magneto-resistance peak for transport through chaotic, stadium cavities-Lorentzian line shape, versus non-chaotic, circle cavities-unusual triangular line shape. In a nearly closed system of individual quantum dot single-electron-transistors, the distribution of the height of Coulomb blockade conductance peaks is strongly non-Gaussian and sensitive to the absence or presence of a magnetic field. Even though our findings are in substantial agreement with the prediction of Random Matrix Theory, there exist evidence that deviations can occur due to the effect of electron-electron interaction. Lastly, we briefly summarize recent observations of pairing effect in ultra-small quantum dots associated with the spin degree of freedom.

Duke Scholars

Published In

Physica Scripta T

ISSN

0281-1847

Publication Date

January 1, 2001

Volume

90

Start / End Page

16 / 25

Related Subject Headings

  • General Physics
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Chang, A. M. (2001). Quantum chaos in GaAs/AlxGa1-xAs microstructures. In Physica Scripta T (Vol. 90, pp. 16–25).
Chang, A. M. “Quantum chaos in GaAs/AlxGa1-xAs microstructures.” In Physica Scripta T, 90:16–25, 2001.
Chang AM. Quantum chaos in GaAs/AlxGa1-xAs microstructures. In: Physica Scripta T. 2001. p. 16–25.
Chang, A. M. “Quantum chaos in GaAs/AlxGa1-xAs microstructures.” Physica Scripta T, vol. 90, 2001, pp. 16–25.
Chang AM. Quantum chaos in GaAs/AlxGa1-xAs microstructures. Physica Scripta T. 2001. p. 16–25.

Published In

Physica Scripta T

ISSN

0281-1847

Publication Date

January 1, 2001

Volume

90

Start / End Page

16 / 25

Related Subject Headings

  • General Physics
  • 02 Physical Sciences
  • 01 Mathematical Sciences