Hits:

Indexed by:Journal Papers

Date of Publication:2019-02-14

Journal:The Journal of chemical physics

Included Journals:PubMed

Volume:150

Issue:6

Page Number:064310

ISSN No.:1089-7690

Key Words:Atomic spectroscopy; Defects; Electric fields; Resonance, Analytical expressions; Atomic collision; Coupled channel methods; External electric field; Feshbach resonances; Multi-channel quantum defect theory; Quantum defects; Threshold behavior, Quantum theory

Abstract:We investigate the modulating action of an external electric field on the magnetically tuned Feshbach resonance in ultracold heteronuclear atomic collision by using the multichannel quantum-defect theory (MQDT). The coupling between different partial wave states induced by an electric field is included into the singlet and triplet quantum defect matrices y(0) and y(1). By taking the truncated -C6/R6 - C8/R8 - C10/R10 potential as the reference potential, the threshold behaviors of four quantum-defect parameters for the lowest three partial waves are described. The results calculated by using the MQDT agree with those calculated using the coupled channel method. Moreover, we present an analytical expression used for describing the variation of the position and width of the magnetically tuned Feshbach resonance modulated by an electric field.