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Theory of Photoinduced Phase Transitions: From Semiclassical to Quantum Aspects

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Abstract:

We review recent progress of theoretical studies for the photoinduced phase tran- sitions (PIPTs) to clarify what the PIPTs are. There are two types of the PIPTs: (a) global change via optically excited states and (b) new material phase creation in optically excited states. First, concerning (a), photoinduced structural phase transitions via excited electronic states are discussed using a minimal one-dimensional model composed of localized electrons and lattices. We show that the global structural change by photoexcitation only at a single site is possible under the adiabatic or diabatic approximation. This dynamics of the domain bound- aries (domain walls) is called the “photoinduced domino process,” which is the photoinduced nucleation in nonequilibrium first-order phase transition. Second, concerning (b), we discuss quantum orders of electron-hole (e-h) systems, which are optically excited states of insulators consisting of many electrons and holes in two bands. In particular, the “exciton Mott transi- tion,” i.e., the “from-insulator-to-metal” transition of the e-h systems as the particle density increases is introduced. We stress that this transition depends strongly on dimensionality of the system.

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Periodical:

Solid State Phenomena (Volume 112)

Pages:

21-38

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.112.21

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Online since:

May 2006

Authors:

Tetsuo Ogawa

Keywords:

Adiabatic Approximations, Bosonization, Diabatic Approximations, Domino Process, Dynamical Meanfield Theory, Electron-Hole System, Electron-Lattice System, Exciton Mott Transition, Photoinduced Phase Transition

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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