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PD Dr. Semjon Stepanow

Research topics

Application of methods of quantum field theory (green’s functions, renormalization group, path integrals) in condensed matter and soft-matter physics:

Equilibrium and dynamics of polymer solutions in good solvents, polymer adsorption, polymers and disorder, polymers under confinement, interface dynamics (domain walls) in disordered media, fluctuations in block copolymer melts, semiflexible polymers, liquid systems in external electric fields, polymer crystallization

Lecture courses

Theoretical Mechanics, Quantum Mechanics, Relativistic Quantum Mechanics, Classical Field Theories, Quantum Electrodynamics, Nuclear Physics and Elementary Particle Physics (exp. course), General Theory of Relativity, Theoretical Polymer Physics (two-semester course), Physics of Critical Phenomena, Physics of Disordered Systems, Thermodynamics, Quantum Field Methods in Condensed Matter Physics, Directed polymers in Condensed Matter Physics (flux lines, non-linear growth, turbulence), Path Integrals in Physics

Textbook:
S. Stepanow, Relativistische Quantentheorie, Für Bachelor: Mit Einführung in die Quantentheorie der Vielteilchensysteme, Lehrbuch, Springer-Verlag, 2010, ISBN 978-3-642-12049-7

Selected publications

F. F. Semeriyanov, S. Stepanow
Bimodal distribution function of a three-dimensional wormlike chain with a fixed orientation of one end,
Phys. Rev. E 75, 061801 (2007)

S. Stepanow, A.A. Fedorenko
Surface segregation of conformationally asymmetric polymer blends,
Phys. Rev. E 73, 031801 (2006)

S. Stepanow
Statistical mechanics of semiflexible polymers,
Eur. Phys. J. B 39, 499 (2004)

A. Kudlay, S. Stepanow
Short-range fluctuations in the Hartree theory of diblock copolymer melts,
J. Chem.Phys. 118, 4272 ( 2003)

S. Stepanow, J.-U. Sommer, I. Ya. Erukhimovich
Localization transition of random copolymers at interfaces,
Phys. Rev. Lett. 81, 4412 (1998)

S. Stepanow, A. V. Dobrynin, T. A. Vilgis, K. Binder
Copolymer melts in disordered media,
J. Phys. I France 6, 837 (1996)

S. Stepanow
The extension of the theory of the microphase separation in block-copolymer melts beyond the random phase approximation (RPA),
Macromolecules 28, 8233 (1995)

T. Nattermann, S. Stepanow, L. H. Tang, and H. Leschhorn
Dynamics of interface depinning in disordered medium,
J. Physique II 2, 1483 (1992)

S. Stepanow
The end vector distribution function of a self-avoiding polymer chain or a random walk for short and large distances: corrections to the scaling,
J. Phys. (France) 51, 899 (1990)

S. Stepanow, G. Helmis
Renormalization group description of the frequency dependence of the dynamical viscosity of dilute polymer solutions in good solvents,
Phys. Rev. A 39, 6037 (1989)

Author of over 60 scientific papers in peer-reviewed journals

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