Physics – Condensed Matter
Scientific paper
1999-02-03
Physics
Condensed Matter
10 pages, 6 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.59.9929
Selftrapping has been traditionally studied on the assumption that quasiparticles interact with harmonic phonons and that this interaction is linear in the displacement of the phonon. To complement recent semiclassical studies of anharmonicity and nonlinearity in this context, we present below a fully quantum mechanical analysis of a two-site system, where the oscillator is described by a tunably anharmonic potential, with a square well with infinite walls and the harmonic potential as its extreme limits, and wherein the interaction is nonlinear in the oscillator displacement. We find that even highly anharmonic polarons behave similar to their harmonic counterparts in that selftrapping is preserved for long times in the limit of strong coupling, and that the polaronic tunneling time scale depends exponentially on the polaron binding energy. Further, in agreement, with earlier results related to harmonic polarons, the semiclassical approximation agrees with the full quantum result in the massive oscillator limit of small oscillator frequency and strong quasiparticle-oscillator coupling.
Bishop Alan R.
Kenkre V. M.
Raghavan Shuba
No associations
LandOfFree
Quantum versus Semiclassical Description of Selftrapping: Anharmonic Effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Quantum versus Semiclassical Description of Selftrapping: Anharmonic Effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum versus Semiclassical Description of Selftrapping: Anharmonic Effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-147779