Zobrazeno 1 - 10
of 195
pro vyhledávání: '"P.N. Butcher"'
Autor:
J.C. Barbosa, P.N. Butcher
Publikováno v:
Superlattices and Microstructures. 22:325-340
The modes of a 2D quantum wire in a perpendicular magnetic field are studied in detail for the real electron energies which are appropriate in nanostructure scattering problems. Propagating and evanescent modes are considered for both asymmetric and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::511ab41f08c9cf67270e32924a192ba6
https://doi.org/10.1006/spmi.1996.0462
https://doi.org/10.1006/spmi.1996.0462
Autor:
J.A. McInnes, P.N. Butcher
Publikováno v:
Surface Science. :640-643
We use a recently developed numerical matching procedure to calculate conductances g 12 and scattering wave functions ψ for a quantum dot. The dot is formed in a 2D quantum wire by pushing in two hard wall fingers with height h , width d and separat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de12cf6008d1f5dfe6e41c5d337f90fb
https://doi.org/10.1016/0039-6028(96)00489-x
https://doi.org/10.1016/0039-6028(96)00489-x
Publikováno v:
Communications in Theoretical Physics. 19:31-38
At high magnetic fields and low temperatures the phonon drag magnetothermopower is dominated by phonons with energies much greater than . This fact is used to develop an approximate formula which can be evaluated in a few percent of the time required
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::34ba9e85ea5f016ed49f78e50aa04787
https://doi.org/10.1088/0253-6102/19/1/31
https://doi.org/10.1088/0253-6102/19/1/31
Publikováno v:
Scopus-Elsevier
Calculations are made with the Landau level width γ as the only adjustable parameter. The results show a 180 o phase shift when γ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b195f32e573e5f57ba13e1f357b697fa
https://doi.org/10.1016/0039-6028(92)90333-2
https://doi.org/10.1016/0039-6028(92)90333-2
Publikováno v:
Superlattices and Microstructures. 9:335-339
Low field mobility and Hall factors, as a function of the superlattice period, are calculated for a non-degenerate electron gas in a miniband of a GaAs/GaAlAs superlattice with a band offset of 250 meV at 300 K. Interface roughness and polar optical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04cd6351b8d6bf0573a562af7a1967f5
https://doi.org/10.1016/0749-6036(91)90255-p
https://doi.org/10.1016/0749-6036(91)90255-p
Autor:
P.N. Butcher, J. A. McINNES
Publikováno v:
Le Journal de Physique Colloques. 42:C4-91
We report numerical calculations of dc Hall mobility for a Holstein 3-site hopping process. In the r-percolation case 7 points are available with αns-1/3 in the range 2 to 6. They are used to study the success of recent analytical treatments. An ana
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99aa1372a72cf92f1707ed5a6f4f222e
https://doi.org/10.1051/jphyscol:1981415
https://doi.org/10.1051/jphyscol:1981415
Autor:
P.N. Butcher, J.A. McInnes
Publikováno v:
Surface Science. 196:139-143
We use percolation theory to derive formulae for the exponent sP and prefactor σP of the average Ohmic hopping conductivity σ of a typical 1D hopping system at low temperatures. The formulae are successfully compared with numerical data for both sP
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50d15c3e94fe52f06cafae21f19d21a2
https://doi.org/10.1016/0039-6028(88)90676-0
https://doi.org/10.1016/0039-6028(88)90676-0
Autor:
P.N. Butcher, W. Lai
Publikováno v:
Solid State Communications. 64:317-320
A mean field calculation is made for a Peierls-Hubbard Hamiltonian supplemented by a term describing electron coupling to intra-molecular vibrations. This has the effect of renormalising the parameters t and U in the Hubbard model in such a way as to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::abc456448d358994465974112e4d5576
https://doi.org/10.1016/0038-1098(87)90972-0
https://doi.org/10.1016/0038-1098(87)90972-0