Effective density of states for a quantum oscillator coupled to a photon field
Betz, Volker and Castrigiano, Domenico P. L.. (2011) Effective density of states for a quantum oscillator coupled to a photon field. Communications in Mathematical Physics, Vol.301 (No.3). pp. 811-839. ISSN 0010-3616Full text not available from this repository.
Official URL: http://dx.doi.org/10.1007/s00220-010-1167-8
We give an explicit formula for the effective partition function of a harmonically bound particle minimally coupled to a photon field in the dipole approximation. The effective partition function is shown to be the Laplace transform of a positive Borel measure, the effective measure of states. The absolutely continuous part of the latter allows for an analytic continuation, the singularities of which give rise to resonances. We give the precise location of these singularities, and show that they are well approximated by first order poles with residues equal to the multiplicities of the corresponding eigenspaces of the uncoupled quantum oscillator. Thus we obtain a complete analytic description of the natural line spectrum of the charged oscillator.
|Item Type:||Journal Article|
|Divisions:||Faculty of Science > Mathematics|
|Journal or Publication Title:||Communications in Mathematical Physics|
|Page Range:||pp. 811-839|
|Funder:||Engineering and Physical Sciences Research Council (EPSRC)|
|Grant number:||EP/D07181X/1 (EPSRC)|
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