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论文类型：期刊论文

发表时间：2019-02-14

发表刊物：The Journal of chemical physics

收录刊物：PubMed

卷号：150

期号：6

页面范围：064310

ISSN号：1089-7690

关键字：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

摘要：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.