66 citations · 92 across the 2 of their papers we have counts for
7 papers
Fractional Quantum Hall Effect in a Diluted Magnetic Semiconductor
C. Betthausen, P. Giudici, A. Iankilevitch +9
We report the observation of the fractional quantum Hall effect in the lowest Landau level of a two-dimensional electron system (2DES), residing in the diluted magnetic semiconduct…
Scanning Raman spectroscopy of graphene antidot lattices: Evidence for systematic p-type doping
S. Heydrich, M. Hirmer, C. Preis +4
We have investigated antidot lattices, which were prepared on exfoliated graphene single layers via electron-beam lithography and ion etching, by means of scanning Raman spectrosco…
Static Charge Coupling of Intrinsic Josephson Junction
Ch. Helm, J. Keller, Ch. Preis +1
A microscopic theory for the coupling of intrinsic Josephson oscillations due to charge fluctuations on the quasi two-dimensional superconducting layers is presented. Thereby in cl…
Microscopic theory of the coupling of intrinsic Josephson oscillations and phonons
Ch. Preis, Ch. Helm, K. Schmalzl +2
A microscopic theory for the coupling of intrinsic Josephson oscillations and dispersive phonon branches in layered superconductors is developed. Thereby the effect of phonons on t…
Coupling of intrinsic Josephson oscillations in layered superconductors by charge fluctuations
Ch. Preis, Ch. Helm, J. Keller +2
The coupling of Josephson oscillations in layered superconductors is studied with help of a tunneling Hamiltonian formalism. The general form of the current density across the barr…
Subgap structures in the current-voltage characteristic of the intrinsic Josephson effect due to phonons
Ch. Helm, Ch. Preis, F. Forsthofer +4
A modified RSJ-model for the coupling of intrinsic Josephson oscillations and c-axis phonons in the high-T_c superconductors Tl_2Ba_2Ca_2Cu_3O_{10+δ} and Bi_2Sr_2CaCu_2O_{8+δ} is d…