Theoretical
Condensed Matter Physics, OGAWA Group
ĄResearch
area: Theoretical condensed matter physics
ĄKeywords
of research: Quantum
theory of condensed matters, quantum optics, nonequilibrium statistical
physics
ĄMembers:Tetsuo
OGAWA (Professor), Taro NAGAO (Assistant Professor)
Ą
Research contents
By
OGAWA:We try to clarify theoretically
dynamical/nonlinear responses of condensed matters and their spatiotemporal
quantum dynamics, in particular, phenomena related to opticallyexcited
states of quantum manybody systems, from both microscopic and phenomenological
viewpoints. Condensedmatter theories to explain "nonlinearity" and "spatiotemporal
evolution" are main targets. In other words, we study responses of coupled
systems, where the fermionic (electronic) fields and the bosonic (photonic,
phononic, excitonic, biexcitonic) fields are mutually interacting with
each other.
(1)
Bosonization theory for a few exciton systems:

HolsteinPrimakoff bosonization for exciton systems

Dyson bosonization for exciton systems

Boson representation of manyexciton systems and their macroscopic quantum
phenomena
(2)
Quantum dynamics of photoinduced phase transitions:

Statistical theory of photoinduced nucleation and domain boundaries

Theory of coalescence, condensation, and fission of excited clusters

Phase separation dynamics of quantum manybody systems with a finite lifetime
(3)
Nonlinear optical responses of quantum manybody systems:

Fermisurface effects and the coupledcluster expansion

Theory of a bosonic reservoir and a ferimonic reservoir
(4)
Impuritytunneling phenomena and material coherence in quantum solids
By
NAGAO:Random matrix theory and its
applications
Fundamental
study on the theory of random matrices and its applications to universal
aspects of@quantum
chaos, mesoscopic electronic systems and QCD lattice gauge theory. Research
on@semiclassical
energy level statistics and semiclassical electric conduction with an aim
to understand the boundary area between classical and quantum theories.
Ą
Purposes of research
To
clarify properties of macroscopic condensedmatter systems with the best
use of quantum@mechanics
and statistical mechanics from a microscopic viewpoint.
Ą
Facilities
Several
workstations. Largescale supercomputer systems at Osaka Univ., Kyoto
Univ., and@ISSP
(Univ. of Tokyo) are also available.
Ą
Web information
http://wwwacty.phys.sci.osakau.ac.jp/~ogawa/introduction_e.htm