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Acta Physica Sinica

ENERGY－ LEVEL－EXCITATIONS——THE ELEMENTARY EXCITATIONS IN THE CRYSTAL-OPTICAL- FIELD STRONG-COUPLED SYSTEM

Duan Lu-ming, Guo Guang-Can, 中国科学技术大学物理系

Published Jan 1, 1997• 0 citations
Publisher

Abstract

It is found that a new kind of excitations,the energy-level-excitations,exist in a narrow-band crystal which strongly couples to the optical field. The energy spectrum and some other properties of the energy-level excitations are analyzed.
DOI
10.7498/aps.46.1114

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Ultracold polar molecules trapped on an optical lattice is a many-body system that, under appropriate conditions, may support collective excitations reminiscent of excitons in solid state crystals. Here, we discuss the rotational excitations of molecules on an optical lattice leading to rotational Frenkel excitons. Apart from solid hydrogen, there is no other natural system that exhibits rotational excitons. The rotational excitons have unique properties that can be exploited for tuning non-linear exciton interactions and exciton-impurity scattering by applying an external electric field. We show that this can be used to explore the competing role of the dynamical and kinematic exciton-exciton interactions in excitonic energy transfer and to study quantum localization in a dynamically tunable disordered potential. The rotational excitons can also be used as a basis for quantum simulation of condensed matter models that cannot be realized with ultracold atoms. As an example, we discuss the possibility of engineering the Holstein model with polar molecules on an optical lattice.