Zobrazeno 1 - 10
of 50
pro vyhledávání: '"V W Rampton"'
Autor:
V. W. Rampton, J.R. Middleton, M.R. Gates, J.S. Chauhan, Mohamed Henini, R.B. Dunford, Christopher J. Mellor
Publikováno v:
Physica B: Condensed Matter. :219-222
For a double layer 2D hole system, a maximum in velocity shift at ν =1 was only observed at frequencies above 560 MHz. The background velocity shift in the region where the Fermi level lies in the extended states region was observed to increase with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc76b7853b3ddf223d6a80c29a456241
https://doi.org/10.1016/s0921-4526(02)00463-5
https://doi.org/10.1016/s0921-4526(02)00463-5
Autor:
M.R. Gates, Mohamed Henini, J.R. Middleton, R.B. Dunford, Christopher J. Mellor, J.S. Chauhan, V. W. Rampton
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:462-465
The surface acoustic wave velocity shift and acoustoelectric effect have been studied in a double layer GaAs/AlGaAs 2D hole system. The transverse acoustoelectric field exhibited bipolar peaks centred at integer filling factor, in qualitative agreeme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aaff710f2ad64896be76a74579e92cd3
https://doi.org/10.1016/s1386-9477(01)00333-2
https://doi.org/10.1016/s1386-9477(01)00333-2
Autor:
M.R. Gates, Mohamed Henini, J.R. Middleton, Christopher J. Mellor, R.B. Dunford, J.S. Chauhan, V. W. Rampton
Publikováno v:
Physica B: Condensed Matter. 298:70-73
The temperature and frequency dependence of the surface acoustic wave (SAW) velocity shift has been studied in a double layer 2DHS for 0.34–4.2 K and 112–560 MHz. The measured velocity shift has been compared to the velocity shift calculated from
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0f45a64edac0eb300e848c0adf42b66a
https://doi.org/10.1016/s0921-4526(01)00262-9
https://doi.org/10.1016/s0921-4526(01)00262-9
Autor:
Mohamed Henini, B Bracher, Christopher J. Mellor, V. W. Rampton, I Kennedy, C. T. Foxon, J. J. Harris
Publikováno v:
Semiconductor Science and Technology. 16:136-139
The surface acoustic wave attenuation and dispersion have been measured as a function of magnetic field for both a two-dimensional electron system and a two-dimensional hole system at frequencies between 100 and 1100 MHz. The experiments were made at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::903312fc98d448511ff553527ddcdf27
https://doi.org/10.1088/0268-1242/16/3/302
https://doi.org/10.1088/0268-1242/16/3/302
Publikováno v:
Physica B: Condensed Matter. :94-97
Two versions of the acoustic deep-level transient spectroscopy (A-DLTS) technique based on the acoustoelectric effect resulting from the interaction between an acoustic wave and heterostructure interfaces have been used to study deep centres in GaAs/
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6ec783f4e28f905991f37dbe24b188d
https://doi.org/10.1016/s0921-4526(98)01200-9
https://doi.org/10.1016/s0921-4526(98)01200-9
Autor:
Christopher J. Mellor, Mohamed Henini, V. W. Rampton, Peter Coleridge, Z. R. Wasilewski, B Bracher, I Kennedy
Publikováno v:
Scopus-Elsevier
The integer and fractional quantum Hall effects have been investigated using the acoustoelectric effect in both two-dimensional hole and electron systems fabricated by MBE on GaAs. Measurements have been made of the longitudinal and transverse acoust
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d6772d417f0ea21631a24d1c39dfef6
https://doi.org/10.1016/s0921-4526(98)00062-3
https://doi.org/10.1016/s0921-4526(98)00062-3
Publikováno v:
Surface Science. 373:379-392
The acoustoelectric effect induced by the coupling between a surface acoustic wave and a two-dimensional electron system is investigated on GaAs AlGaAs heterojunctions at 4.2 K in the quantum Hall effect regime. This work was performed to study two-d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3bf5aac4924b379affb174b908ecc345
https://doi.org/10.1016/s0039-6028(96)01166-1
https://doi.org/10.1016/s0039-6028(96)01166-1
Autor:
A G Kozorezov, V W Rampton
Publikováno v:
Semiconductor Science and Technology. 10:1089-1098
A theoretical study has been made of the interaction of longitudinal coherent bulk acoustic waves at 9.4 GHz with a 2DEG at a GaAs/AlGAs heterojunction in a strong magnetic field. A generalized transfer matrix formalism was used to consider such a dy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::398a5b1ce0fac015409ada154aa86bab
https://doi.org/10.1088/0268-1242/10/8/006
https://doi.org/10.1088/0268-1242/10/8/006
Publikováno v:
Physica Status Solidi (a). 133:363-369
The acoustoelectric effect resulting from the interaction between a longitudinal acoustic wave at 13 MHz and the two-dimensional electron gas (2-DEG) in a GaAs/AlGaAs heterostructure is described. Quantum oscillations in the acoustoelectric response
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebaab410a5767e48da804b926b5cd25c
https://doi.org/10.1002/pssa.2211330219
https://doi.org/10.1002/pssa.2211330219
Autor:
O.H. Hughes, Mohamed Henini, P. J. A. Carter, A. G. Kozorezov, K. B. McEnaney, V. W. Rampton, C. D. W. Wilkinson
Publikováno v:
Semiconductor Science and Technology. 7:641-647
The surface acoustic wave (SAW) transmission has been measured at 4.2 K, as a function of magnetic field up to 5 T, for a GaAs wafer on which a heterojunction has been grown by MBE. Frequencies up to 1920 MHz were generated by interdigital SAW transd
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96509c5ffb12061aa411add5e0eeb2bf
https://doi.org/10.1088/0268-1242/7/5/004
https://doi.org/10.1088/0268-1242/7/5/004