Naoum Karchev

Associate Professor
Sofia University
Department of Physics
1164 Sofia 5 J.Bourchier
Tel: +3592-6256/680
Fax: +3592-9625276

PERSONAL
Born: August 30, 1950, Sofia (Bulgaria). Male, married, two children,
Bulgarian citizen.
Languages: Bulgarian (native), Russian, English.

EDUCATION
- Ph.D., Physics, December 1980, Quantum Field Theory Dept.
Seklov Mathematical Institute, Moscow
- B.Sc., Theoretical Physics, 1976 , Sofia University

EMPLOYMENT
1990-present: Associate Professor, Department of Physics, Sofia University.

1989-1990: Research Physicist, Steklov Mathematical Institute, Moscow.

1980-1989: Assistant Professor, Department of Physics, Sofia University.

PROFESSIONAL EXPERIENCE and INTERESTS

-Double exchange model.

-Bound states of Cooper’s pairs and electrons.

-Coexistence of ferromagnetism and superconductivity, ferromagnetic superconductivity
-Effective models for strongly interacting matter.
-Spin-wave and gauge theory of Heisenberg magnets, t-J, Hubbard models.
-Renormalization-group methods for investigation of small spin Heisenberg magnets.

TEACHING EXPERIENCE
I have taught Mathematical Methods in Physics, Classical Mechanics, Quantum Mechanics, Quantum Field Theory, Path Integral Approach to QFT, Particle Physics and Theoretical Physics for Mathematicians.

RECENT PUBLICATIONS

-J.Phys.;Condens.Matter 18, 1553-1566 (2006), N.I.Karchev
“Bound states of Cooper pairs and electrons in the superconducting phase of MgB2 ”

-J.Phys.;Condens.Matter 17, 697-706 (2005), N.I.Karchev
“Normal metal to ferromagnetic superconductor tunneling.”

-Phys.Rev., B67, 054416 (2003), N.Karchev
"Magnon exchange mechanism of ferromagnetic superconductivity. "

-J.Phys.;Condens.Matter 15, 2797 (2003), N.I.Karchev
"Magnon-paramagnon effective theory of itinerant ferromagnets".

-J.Phys.;Condens.Matter 15, L385 (2003), N.Karchev
"Magnon-Mediated Superconductivity in Itinerant Ferromagnets."

- Phys.Rev.Lett., 86, 846 (2001)
N.I.Karchev, K.B.Blagoev, K.S.Bedell, and P.B.Littlewood
"Coexistence of superconductivity and ferromagnetism in ferromagnetic metals."

FAVOURITE PAPERS
- Phys.Rev., B57, 10913 (1998), N.Karchev
"Generalized CP^1 model from t^1-t^2-J model"

-Phys.Rev., B55, 6372,(1997), N.I.Karchev
"Renormalization-Group approach to Spin-Wave Theory of Heisenberg ferromagnet"

-Phys.Rev., B47, 8613-8619 (1993), N.I.Karchev and T.S.Hristov
"Spin-wave theory of the spiral phase of the t-J model."

Phys.Rev., B44, 4576-4585 (1991), N.I.Karchev
"Chiral spin states, hole dynamics, and superconductivity in strongly correlated electronic systems."