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Absence of Vacuum Induced Berry Phases without the Rotating Wave Approximation in Cavity QED
Stockholm University, Faculty of Science, Department of Physics. Universität zu Köln, Germany.
Number of Authors: 12012 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 3, article id 033601Article in journal (Refereed) Published
Abstract [en]

We revisit earlier studies on Berry phases suggested to appear in certain cavity QED settings. It has been especially argued that a nontrivial geometric phase is achievable even in the situation of no cavity photons. We, however, show that such results hinge on imposing the rotating wave approximation (RWA), while without the RWA no Berry phases occur in these schemes. A geometrical interpretation of our results is obtained by introducing semiclassical energy surfaces which in a simple way brings out the phase-space dynamics. With the RWA, a conical intersection between the surfaces emerges and encircling it gives rise to the Berry phase. Without the RWA, the conical intersection is absent and therefore the Berry phase vanishes. It is believed that this is a first example showing how the application of the RWA in the Jaynes-Cummings model may lead to false conclusions, regardless of the mutual strengths between the system parameters.

Place, publisher, year, edition, pages
2012. Vol. 108, no 3, article id 033601
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162426DOI: 10.1103/PhysRevLett.108.033601ISI: 000299328500010PubMedID: 22400739OAI: oai:DiVA.org:su-162426DiVA, id: diva2:1267784
Available from: 2018-12-04 Created: 2018-12-04 Last updated: 2018-12-04Bibliographically approved

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