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pro vyhledávání: '"Rolf R Gerhardts"'
Autor:
Rolf R Gerhardts
Publikováno v:
New Journal of Physics, Vol 21, Iss 7, p 073007 (2019)
A previously developed self-consistent screening and magneto-transport theory for laterally confined, translation-invariant quantum-Hall-systems is applied to two-dimensional electron systems created by a donor sheet with a lateral density modulation
Externí odkaz:
https://doaj.org/article/abda415db5f34191829b95267f138253
Publikováno v:
New Journal of Physics, Vol 15, Iss 7, p 073034 (2013)
First, we present recent experimental results confirming previously predicted strong asymmetries of the current distribution in narrow Hall bars under conditions of the integer quantum Hall effect (IQHE). Then, using a previously developed self-consi
Externí odkaz:
https://doaj.org/article/ac8e34139f054c01a51628a01a58cf21
Autor:
Rolf R. Gerhardts
Publikováno v:
Recent Progress in Materials. 2:1-39
We summarize and discuss a self-consistent screening and magneto-transport theory, developed to understand the results of scanning-force-microscope experiments on the current distribution in a two-dimensional electron system (2DES), located in a narr
Autor:
Rolf R. Gerhardts
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 85:38-46
Recent low-temperature scanning-force-microscopy experiments on narrow Hall bars, under the conditions of the integer quantum Hall effect (IQHE) and its breakdown, have revealed an interesting position dependence of the Hall potential, which changes
Autor:
Rolf R. Gerhardts
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 74:160-167
Model calculations for commensurability oscillations of the low-field magnetoresistance of two-dimensional electron systems (2DES) in lateral superlattices, consisting of unit cells with an internal structure, are compared with recent experiments. Th
Autor:
Rolf R. Gerhardts
Publikováno v:
physica status solidi (b). 245:378-392
We summarize and critically discuss the screening theory of the integer quantized Hall effect (IQHE), which was recently developed in order to understand scanning-force-microscope experiments on the current distribution in narrow Hall bars. The theor
Autor:
Rolf R. Gerhardts, Shun-Jen Cheng
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:554-557
We theoretically investigate, within the random phase approximation, the collective excitations of symmetric wide quantum wells under in-plane magnetic fields B||. We find that the B|| field significantly affects the frequencies, (an-)isotropy and ty
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:204-207
We discuss magnetoresistance oscillations of a two-dimensional electron gas in a rectangular-symmetric lateral superlattice defined by weak electric and magnetic fields. We demonstrate how guiding-center drift along closed orbits can lead to a suppre
Publikováno v:
Physica B: Condensed Matter. 298:353-358
We present analytical and numerical results of a classical magnetotransport theory, based on Boltzmann's equation, for a two-dimensional electron gas in a two-dimensional superlattice of square symmetry. We show that commensurability oscillations of
Autor:
Johannes Groß, Rolf R. Gerhardts
Publikováno v:
Physica B: Condensed Matter. 298:83-87
We sketch and evaluate a new, conserving approximation scheme for the quantum magnetotransport in a two-dimensional electron system with a one-dimensional periodic modulation, which is based on the self-consistent Born approximation. Unlike the usual