Prof. Dr. Rolf Gerhardts
Brief Curriculum Vitae
Prof. Dr. Rolf Gerhardts was head of the theory group in the von Klitzing department, and as such retired in 2005. He presently investigates the role of screening in narrow Hall bars, based on (AlGa)As/GaAs heterostructures, under the conditions of the integer quantum Hall effect.
Rolf-Rüdiger Gerhardts was born on June 14, 1940, in Haan (Rheinland), went to school in Hilden, and studied physics at the Universität zu Köln (diploma 1967 with Prof. B. Mühlschlegel, Dr. rer. nat. 1969 with Prof. J. Hajdu). During his time as 'scientific assistant' in Köln he spent, with a scholarship of the Deutsche Forschungsgemeinschaft, a year as postdoc at the Stanford University (1972/73) with Prof. S. Doniach, and got the 'venia legendi for Theoretical Physics' in 1975. After about eleven years at the "Freie Universität Berlin", first as 'Assistant professor' (1975), later as 'C2-Professor' (1982), he came 1986 to the MPI for Solid State Research in Stuttgart and joined the von Klitzing department. Since 1997 he also was 'apl. Professor' at the University of Würzburg.
Research Keywords (selection)
- Magnetotransport in semiconductors, metal optics
- 2D magnetotransport in lateral superlattices
- Collective excitations in quasi two-dimensional charge systems
- Screening and transport in quantum Hall systems
- Effect of surface- and interface-states on doped heterostrutures
High Field Magnetoresistance at Low Temperatures,
R. Gerhardts and J. Hajdu, Z. Physik 245, 126 (1971).
Precursor Diamagnetism in Layered and Isotropic Superconductors,
R. R. Gerhardts, Phys. Rev. B 9, 2945 (1974).
Path-Integral Approach to the Two-Dimensional Magneto-Conductivity Problem: I. General Formulation of the Approach; II. Application to n-Type (100)-Surface Inversion Layers of p-Silicon,
R. R. Gerhardts, Z. Physik B 21, 275 (1975); 285 (1975).
Self-Consistent Transport Equations for Electron-Impurity Systems in a Magnetic Field,
R. R. Gerhardts, Z. Physik B 22, 327 (1975).
Metal Optics Near the Plasma Frequency,
F. Forstmann and R.R. Gerhardts, Springer Tracts in Modern Physics, Vol. 109, (Springer-Verlag Berlin, Heidelberg, 1986), [Monographie]
Novel Magnetoresistance Oscillations in a Periodically Modulated Two-Dimensional Electron Gas,
R.R. Gerhardts, D. Weiss, K. von Klitzing, Phys. Rev. Lett. 62, 1173 (1989).
Theory of magneto-transport in two-dimensional electron systems with unidirectional periodic modulation,
C. Zhang and R. R. Gerhardts, Phys. Rev. B 41, 12 850 (1990).
Self-consistent calculation of edge channels in laterally confined two-dimensional electron systems,
K. Lier and R. R. Gerhardts, Phys. Rev. B 50, 7757 (1994).
Exchange enhanced spin splitting in a two-dimensional electron system with lateral modulation,
A. Manolescu and R. R. Gerhardts, Phys. Rev. B 51, 1703 (1995).
Hofstadter-type energy spectra in lateral superlattices defined by periodic magnetic and electrostatic fields,
R. R. Gerhardts, D. Pfannkuche, and V. Gudmundsson, Phys. Rev. B 53, 9591 (1996).
Positive Magnetoresistance of Composite Fermion Systems with a Weak One-Dimensional Density Modulation,
S.D.M. Zwerschke and R.R. Gerhardts, Phys. Rev. Lett. 83, 2616 (1999).
Coupled two-layer plasmon modes induced in a single quantum well by in-plane magnetic fields,
Shun-Jen Cheng and Rolf R. Gerhardts, Phys. Rev. B 65, 085307 (2002).
Self-consistent local-equilibrium model for density profile and distribution of dissipative currents in a Hall bar under strong magnetic fields,
K. Güven and R. R. Gerhardts, Phys. Rev. B 67, 115327 (2003).
Incompressible strips in dissipative Hall bars as origin of quantized Hall plateaus,
A. Siddiki and R. R. Gerhardts, Phys. Rev. B 70, 195335 (2004).
Double-peak structure of the nonresonant photoresponse of terahertz quantum Hall detectors
G. Nachtwei, F. Gouider, C. Stellmach, G. Vasile, Yu. B. Vasilyev, G. Hein, and R. R. Gerhardts, Phys. Rev. B 78, 174305 (2008).
Model for the electron distribution in modulation-doped heterostructures with high density of surface states,
R. R. Gerhardts, Phys. Rev. B 81, 205324 (2010).