Alan Usher

'Decay of long-lived quantum Hall induced currents in 2D electron systems'

Kershaw, T. J., Usher, A., Sachrajda, A. S., Gupta, J., Wasilewski, Z. R., Elliott, M., Ritchie, D. A. and Simmons, M. Y.

New Journal of Physics 9 71-71 (2007)

'Influence of the long-lived quantum Hall potential on the characteristics of quantum devices'

Pioro-Ladriere, M., Usher, A., Sachrajda, A. S., Lapointe, J., Gupta, J., Wasilewski, Z., Studenikin, S. and Elliott, M.

Physical Review B 73 075309 (2006)

'Hysteretic effects in lateral nanostructures caused by long-lived quantum-Hall eddy currents'

Pioro-Ladriere, M., Usher, A., Sachrajda, A. S., Elliott, M., Lapointe, J., Gupta, J., Wasilewski, Z. R. and Studenikin, S.

Physica E-Low-Dimensional Systems & Nanostructures 34 476-479 (2006)

'Novel breakdown of the quantum Hall effect: An example of self-organised criticality?'

Elliott, M., Lu, Y., Phillips, K. L., Herrenden-Harker, W. G., Usher, A., Matthews, A. J., Gething, J. D., Zhu, M., Henini, M. and Ritchie, D. A.

Europhysics Letters 75 287-293 (2006)

'Induced currents, frozen charges and the quantum Hall effect breakdown'

Kavokin, K. V., Portnoi, M. E., Matthews, A. J., Usher, A., Gething, J., Ritchie, D. A. and Simmons, M. Y.

Solid State Communications 134 257-259 (2005)

'Equilibrium magnetization measurements of two-dimensional electron systems'

Usher, A., Zhu, M., Matthews, A. J., Potts, A., Elliott, M., Herrenden-Harker, W. G., Ritchie, D. A. and Simmons, M. Y.

Physica E-Low-Dimensional Systems & Nanostructures 22 741-744 (2004)

'Self-organised criticality in the quantum Hall effect'

Phillips, K. L., Elliott, M., Lu, Y., Herrenden-Harker, W. G., Matthews, A. J., Gething, J. D., Usher, A., Henini, M., Ritchie, D. A. and Simmons, M. Y.

Physica E-Low-Dimensional Systems & Nanostructures 22 210-213 (2004)

'A low-temperature high-sensitivity torsion balance magnetometer with in situ stator adjustment'

Matthews, A. J., Usher, A. and Williams, C. D. H.

Review of Scientific Instruments 75 2672-2677 (2004)

'Temperature-dependent high-current breakdown of the quantum Hall effect'

Matthews, A. J., Kavokin, K. V., Usher, A., Portnoi, M. E., Zhu, M., Gething, J. D., Elliott, M., Herrenden-Harker, W. G., Phillips, K., Ritchie, D. A., Simmons, M. Y., Sorensen, C. B., Hansen, O. P., Mironov, O. A., Myronov, M., Leadley, D. R. and Henini, M.

Physica E-Low-Dimensional Systems & Nanostructures 22 201-204 (2004)

'Temperature dependence of the breakdown of the quantum Hall effect studied by induced currents'

Matthews, A. J., Kavokin, K. V., Usher, A., Portnoi, M. E., Zhu, M., Gething, J. D., Elliott, M., Herrenden-Harker, W. G., Phillips, K., Ritchie, D. A., Simmons, M. Y., Sorensen, C. B., Hansen, O. P., Mironov, O. A., Myronov, M., Leadley, D. R. and Henini, M.

Physical Review B 70 075317 (2004)

'High-current breakdown of the quantum Hall effect'

Matthews, A. J., Kavokin, K. V., Usher, A., Portnoi, M. E., Gething, J. D., Zhu, M. and Ritchie, D. A.

International Journal of Modern Physics B 18 3593-3596 (2004)

'Breakdown of the quantum hall effects in hole systems at high induced currents'

Gething, J. D., Matthews, A. J., Usher, A., Portnoi, M. E., Kavokin, K. V. and Henini, M.

International Journal of Modern Physics B 18 3537-3540 (2004)

'Magnetization measurements of high-mobility two-dimensional electron gases'

Zhu, M., Usher, A., Matthews, A. J., Potts, A., Elliott, M., Herrenden-Harker, W. G., Ritchie, D. A. and Simmons, M. Y.

Physical Review B 67 155329 (2003)

'Exchange-enhanced energy shifts in the polarized photoluminescence of a two-dimensional hole system in the integer quantum Hall regime'

Kehoe, T. B., Townsley, C. M., Usher, A., Henini, M. and Hill, G.

Physical Review B 68 045325 (2003)

'Current breakdown of the integer and fractional quantum Hall effects detected by torque magnetometry'

Matthews, A. J., Watts, J. P., Zhu, M., Usher, A., Elliott, M., Herrenden-Harker, W. G., Morris, P. R., Simmons, M. Y. and Ritchie, D. A.

Physica E-Low-Dimensional Systems & Nanostructures 6 140-143 (2000)

'Optical detection of charge redistribution in a delta modulation-doped GaAs-AlxGa1-xAs heterojunction'

Kerridge, G. C., Greally, M. G., Hayne, M., Usher, A., Plaut, A. S., Brum, J. A., Holland, M. C. and Stanley, C. R.

Solid State Communications 109 267-271 (1999)

'Photoluminescence of negatively charged excitons in high magnetic fields'

Hayne, M., Jones, C. L., Bogaerts, R., Riva, C., Usher, A., Peeters, F. M., Herlach, F., Moshchalkov, V. V. and Henini, M.

Physical Review B 59 2927-2931 (1999)

'Current breakdown of the fractional quantum Hall effect through contactless detection of induced currents'

Watts, J. P., Usher, A., Matthews, A. J., Zhu, M., Elliott, M., Herrenden-Harker, W. G., Morris, P. R., Simmons, M. Y. and Ritchie, D. A.

Physical Review Letters 81 4220-4223 (1998)

'Remote impurity scattering in modulation-doped GaAs/AlxGa1-xAs heterojunctions'

Hayne, M., Usher, A., Harris, J. J., Moshchalkov, V. V. and Foxon, C. T.

Physical Review B 57 14813-14817 (1998)

'Excitonic and free-carrier recombination of a two-dimensional electron gas in high magnetic fields'

Hayne, M., Jones, C. L., Bogaerts, R., Usher, A., Herlach, F., Moshchalkov, V. V. and Henini, M.

Physica B 258 327-330 (1998)

'PLE studies of two-dimensional hole systems in the quantum Hall regime'

Townsley, C. M., Usher, A., Gallagher, B. L., Henini, M. and Hill, G.

Physica E 1 116-119 (1997)

'Milli-Kelvin magneto-transport studies of two-dimensional hole systems under illumination'

Ponomarev, Y. V., Usher, A., Hayne, M., Rodgers, P. J., Gallagher, B. L., Henini, M. and Hill, G.

Solid State Communications 102 53-58 (1997)

'Quantum versus semiclassical analysis of the conductivity of two-dimensional electrons in a magnetic field'

Hayne, M., Usher, A., Harris, J. J. and Foxon, C. T.

Physical Review B 56 10446-10452 (1997)

'Transport studies of localized and extended states of a two-dimensional electron gas in low magnetic fields'

Hayne, M., Usher, A., Harris, J. J. and Foxon, C. T.

Physica E 1 125-128 (1997)

'Magnetization studies of Landau level broadening in two-dimensional electron systems'

Potts, A., Shepherd, R., HerrendenHarker, W. G., Elliott, M., Jones, C. L., Usher, A., Jones, G. A. C., Ritchie, D. A., Linfield, E. H. and Grimshaw, M.

Journal of Physics-Condensed Matter 8 5189-5207 (1996)

'Millikelvin magneto-optical studies of two-dimensional hole systems'

Ponomarev, Y. V., Usher, A., Rodgers, P. J., Gallagher, B. L., Henini, M. and Hill, G.

Physical Review B 54 13891-13898 (1996)

'Contactless detection of current breakdown of the quantum Hall effect'

Jones, C. L., Usher, A., Cheng, T. S. and Foxon, C. T.

Solid State Communications 97 763-768 (1996)

'An elegant verification of the negative charge-state of the DX centre from mobility measurements of 2D electrons'

Hayne, M., Usher, A., Harris, J. J. and Foxon, C. T.

Surface Science 362 574-578 (1996)

'Low-temperature mobility of two-dimensional electrons in (Ga,In)As-(Al,In)As heterojunctions'

Greally, M. G., Hayne, M., Usher, A., Hill, G. and Hopkinson, M.

Journal of Applied Physics 79 8465-8469 (1996)

'The Decay of Induced Eddy Currents in a 2-Dimensional Electron-System'

Jones, C. L., Usher, A., Cheng, T. S. and Foxon, C. T.

Solid State Communications 95 409-413 (1995)

'Studies of the Extreme Quantum Limit of 2d Hole Systems'

Gallagher, B. L., Rodgers, P. J., Langerak, Cjgm, Crump, P. A., Henini, M., Hill, G., Wiegers, S. A. J., Perenboom, Jaaj, Ponomarev, Y. and Usher, A.

Physica B 211 417-419 (1995)

'Optically Induced Density Depletion of the 2-Dimensional Electron-System in Gaas/Alxga1-Xas Heterojunctions'

Hayne, M., Usher, A., Plaut, A. S. and Ploog, K.

Physical Review B 50 17208-17216 (1994)

'Exchange Enhancement of the Landau-Level Separation for 2-Dimensional Electrons in Gaas/Ga1-Xalxas Heterojunctions'

Hayne, M., Usher, A., Harris, J. J. and Foxon, C. T.

Physical Review B 46 9515-9519 (1992)

'Temperature-Dependence of the Luminescence from a 2-Dimensional Electron-System in the Wigner Solid Regime'

Hayne, M., Ellis, M. K., Plaut, A. S., Usher, A. and Ploog, K.

Surface Science 263 39-43 (1992)

'Magnetooptical Determination of the Electron-Solid Phase-Boundary'

Ellis, M. K., Hayne, M., Usher, A., Plaut, A. S. and Ploog, K.

Physical Review B 45 13765-13768 (1992)

'Observation of Magnetic Excitons and Spin-Waves in Activation Studies of a 2-Dimensional Electron-Gas'

Usher, A., Nicholas, R. J., Harris, J. J. and Foxon, C. T.

Physical Review B 41 1129-1134 (1990)

'Experimental Tests of Fractional Quantum Hall-Effect Theory'

Clark, R. G., Mallett, J. R., Usher, A., Suckling, A. M., Nicholas, R. J., Haynes, S. R., Journaux, Y., Harris, J. J. and Foxon, C. T.

Surface Science 196 219-235 (1988)

'High field magnetotransport: the fractional quantum Hall effect'

Nicholas, R. J., Clark, R. G., Usher, A., Mallett, J. R., Suckling, A. M., Harris, J. J. and Foxon, C. T.

NATO ASI, Erice, 1987

'Recent advances in the study of the fractional quantum Hall effect'

Nicholas, R. J., Clark, R. G., Usher, A., Mallett, J. R., Suckling, A. M., Harris, J. J. and Foxon, C. T.

in 'High Magnetic Fields in Semiconductor Physics' edited by Landwehr, G. Springer Series in Solid-State Sciences 71 146 (1987) 

'Systematic Studies of the Fractional Quantum Hall-Effect'

Nicholas, R. J., Clark, R. G., Usher, A., Mallett, J. R., Suckling, A. M., Harris, J. J. and Foxon, C. T.

Physica Scripta T19A 72-78 (1987)

'The fractional quantum Hall effect in GaAs-GaAlAs heterojunctions'

Nicholas, R. J., Clark, R. G., Usher, A., Mallett, J. R., Suckling, A. M., Harris, J. J. and Foxon, C. T.

in 'Two-Dimensional Systems: Physics and New Devices' edited by Bauer, G.; Kuchar, F.; Heinrich, H. Springer Series in Solid-State Sciences 67 194 (1986) 

'High-Order Fractional Quantization in a Two-Dimensional System'

Nicholas, R. J., Clark, R. G., Usher, A., Foxon, C. T. and Harris, J. J.

Solid State Communications 60 183-187 (1986)

'Odd and Even Fractionally Quantized States in Gaas-Gaalas Heterojunctions'

Clark, R. G., Nicholas, R. J., Usher, A., Foxon, C. T. and Harris, J. J.

Surface Science 170 141-147 (1986)

'The fractional quantum Hall effect in GaAs-GaAlAs heterojunctions'

Clark, R. G., Nicholas, R. J., Mallett, J. R., Suckling, A. M., Usher, A., Harris, J. J. and Foxon, C. T.

18th International Conference on the Physics of Semiconductors, Stockholm, 1986

'Electron-Concentration Dependent Fractional Quantization in a 2 Dimensional System'

Clark, R. G., Nicholas, R. J., Brummell, M. A., Usher, A., Collocott, S., Portal, J. C., Alexandre, F. and Masson, J. M.

Solid State Communications 56 173-176 (1985)

'Quasi Thermalization in a Strongly Non-Linear Transmission-Line'

Usher, A. and Jefferies, D. J.

Physics Letters A 98 396-398 (1983)

'Frequency-Division Using Diodes in Resonant Systems'

Jefferies, D. J. and Usher, A.

Physics Letters A 99 356-358 (1983)