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Breakdown of the Quantum Hall Effect

100%

Maude D., Rigal L., Desrat W., Potemski M., Portal J., Eaves L., Wasilewski Z., Toropov A., Hill G.

Acta Physica Polonica A

2001

vol. 100

issue 2

213-226

The breakdown of the dissipationless conductance in the integer and fractional quantum Hall effect regime is reviewed. The temperature dependence of the critical current and of the critical magnetic field at breakdown bears a striking resemblance to the phase diagram of the phenomenological two-fluid Gorter-Casimir model for superconductivity. In addition, a remarkably simple scaling law exists between different filling factors.

Quantum States of Self-Assembled InAs Dots Probed by Magneto-Tunneling Spectroscopy

100%

Patanè A., Eaves L., Main P., Levin A., Zambrano M., Henini M., Vdovin E., Dubrovskii Y., Hill G.

Acta Physica Polonica A

2001

vol. 100

issue 2

165-173

We present an experimental study of the electron wave function in InAs/GaAs self-assembled quantum dots. Magneto-tunneling spectroscopy is employed as a non-invasive probe to produce two-dimensional images of the probability density of an electron confined in a quantum dot. The images reveal the elliptical symmetry of the ground state and the characteristic lobes of the higher energy states of the dots.

Electronic Properties of InAs/GaAs Self-Assembled Quantum Dot Structures and Devices Studied by Photocurrent Spectroscopy

81%

Mowbray D. J., Fry P. W., Skolnick M. S., Itskevich I. E., Harris L., Ashmore A. D., Finley J. J., Wilson L. R., Schumacher K. L., Barker J. A., O'Reilly E. P., Al-Khafaji M., Cullis A. G., Hopkinson M., Clark J. C., Hill G.

Acta Physica Polonica A

2000

vol. 98

issue 3

279-293

The power of photocurrent spectroscopy to study the electronic properties of InAs/GaAs self-assembled quantum dots is described. From comparison of results from different samples it is shown that photocurrent provides a direct means to measure absorption spectra of quantum dots. Studies in high electric field enable the electron-hole vertical alignment to be determined. Most surprisingly this is found to be opposite to that predicted by all recent predictions. Comparison with theory shows that this can only be explained if the dots contain significant amounts of gallium, and have a severely truncated shape. The nature of the ground and excited state transitions, carrier escape mechanisms from dots, in-plane wave function anisotropies and the modal gain of a quantum dot laser are determined.

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3 Acta Physica Polonica A

2 2001

1 2000

3 Hill G.

2 Eaves L.

1 Al-Khafaji M.

1 Ashmore A. D.

1 Barker J. A.

1 Clark J. C.

1 Cullis A. G.

1 Desrat W.

1 Dubrovskii Y.

1 Finley J. J.

1 Fry P. W.

1 Harris L.

1 Henini M.

1 Hopkinson M.

1 Itskevich I. E.

1 Levin A.

1 Main P.

1 Maude D.

1 Mowbray D. J.

1 O'Reilly E. P.

1 Patanè A.

1 Portal J.

1 Potemski M.

1 Rigal L.

1 Schumacher K. L.

1 Skolnick M. S.

1 Toropov A.

1 Vdovin E.

1 Wasilewski Z.

1 Wilson L. R.

1 Zambrano M.

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Breakdown of the Quantum Hall Effect

Quantum States of Self-Assembled InAs Dots Probed by Magneto-Tunneling Spectroscopy

Electronic Properties of InAs/GaAs Self-Assembled Quantum Dot Structures and Devices Studied by Photocurrent Spectroscopy