skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Electric-field-induced Feshbach resonances in ultracold alkali-metal mixtures

Abstract

We present a detailed analysis of Feshbach resonances in ultracold collisions of Li and Cs atoms in the presence of superimposed electric and magnetic fields. We show that electric fields induce resonances through couplings between the s- and p-wave scattering channels and modify the scattering length to a great extent. Electric-field-induced resonances lead to the anisotropy of ultracold scattering and provide the diagnostics for magnetic p-wave resonances in ultracold gases. We show that the electric field couplings may shift the positions of s-wave magnetic resonances, thereby making the electric field control of ultracold atoms possible even far away from p-wave resonances. Finally, we demonstrate that electric fields may rotate and spin up the collision complex of ultracold atoms at substantial rates.

Authors:
;  [1]
+ Show Author Affiliations
  1. Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1 (Canada)
Publication Date:
OSTI Identifier:
20982329
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.032709; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANISOTROPY; ATOM-ATOM COLLISIONS; ATOMS; CESIUM; COUPLINGS; ELECTRIC FIELDS; GASES; LITHIUM; MAGNETIC FIELDS; MAGNETIC RESONANCE; MIXTURES; P WAVES; S WAVES; SCATTERING; SCATTERING LENGTHS; SPIN; TEMPERATURE RANGE 0000-0013 K

Citation Formats

Li, Z., and Krems, R. V.. Electric-field-induced Feshbach resonances in ultracold alkali-metal mixtures. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.032709.
Copy to clipboard
Li, Z., & Krems, R. V.. Electric-field-induced Feshbach resonances in ultracold alkali-metal mixtures. United States. doi:10.1103/PHYSREVA.75.032709.
Copy to clipboard
Li, Z., and Krems, R. V.. Thu . "Electric-field-induced Feshbach resonances in ultracold alkali-metal mixtures". United States. doi:10.1103/PHYSREVA.75.032709.
Copy to clipboard
@article{osti_20982329,
title = {Electric-field-induced Feshbach resonances in ultracold alkali-metal mixtures},
author = {Li, Z. and Krems, R. V.},
abstractNote = {We present a detailed analysis of Feshbach resonances in ultracold collisions of Li and Cs atoms in the presence of superimposed electric and magnetic fields. We show that electric fields induce resonances through couplings between the s- and p-wave scattering channels and modify the scattering length to a great extent. Electric-field-induced resonances lead to the anisotropy of ultracold scattering and provide the diagnostics for magnetic p-wave resonances in ultracold gases. We show that the electric field couplings may shift the positions of s-wave magnetic resonances, thereby making the electric field control of ultracold atoms possible even far away from p-wave resonances. Finally, we demonstrate that electric fields may rotate and spin up the collision complex of ultracold atoms at substantial rates.},
doi = {10.1103/PHYSREVA.75.032709},
journal = {Physical Review. A},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}
Copy to clipboard
Journal Article:
DOI:  10.1103/PHYSREVA.75.032709
Other availability
Find in Google Scholar Find in Google Scholar
Search WorldCat Search WorldCat to find libraries that may hold this journal
Save / Share:
Export Metadata
Save to My Library
You must Sign In or Create an Account in order to save documents to your library.

  • ; - Physical Review. A
    The effect of random magnetic fields on the dissociation of ultracold molecules with Feshbach resonances is studied analytically. The dissociation spectrum and the evolution of the molecule fraction are obtained for a general form of the magnetic-field ramp and different noise properties relevant to standard experimental conditions. The results uncover the robustness against noise of some characteristics of the dissociation process, in particular, of the dependence of the mean atomic kinetic energy on the system parameters. Implications for the applicability of a method proposed to determine the width of the Feshbach resonances from the measurement of the dissociation spectrum aremore » analyzed. Moreover, we discuss how the presence of fluctuations can affect the use of particular ramp shapes to tailor the properties of the generated atomic distribution.« less

  • - Physical Review A
    Electric-field effects on the {ital N}=2 Feshbach resonances (both resonance positions and widths) of H{sup {minus}} are investigated theoretically using a method of complex-coordinate rotation. Products of Slater orbitals are used to represent the two-electron wave functions, with {ital l}{sub max}=6 employed for the individual electron. Block matrices with up to {ital L}{sub max}=6 ({ital I} states) are used. Convergence behavior for the resonance parameters (resonance energy and width) is examined by using different values of {ital L}{sub max}. Results for the electric-field effects on the nearly degenerate {sup 1}{ital P}{sup {ital o}}(1) and {sup 1}{ital S}{sup {ital e}}(2) statesmore » are given, as well as the effects on the nearby {sup 1}{ital D}{sup {ital e}}(1) state.« less

  • ; ; ; ... - Physical Review. A
    A Feshbach resonance arises in cold atom scattering due to the complex interplay between several coupled channels. However, the essential physics of the resonance may be encapsulated in a simplified model consisting of just two coupled channels. In this paper we describe in detail how such an effective Feshbach model can be constructed from knowledge of a few key parameters, characterizing the atomic Born-Oppenheimer potentials and the low energy scattering near the resonance. These parameters may be obtained either from experiment or full coupled-channel calculations. Using R-matrix theory we analyze the bound state spectrum and the scattering properties of themore » two-channel model, and find it to be in good agreement with exact calculations.« less

  • ; ; - Physical Review. A
    No abstract prepared.

  • ; ; ; ... - Physical Review. A
    A rigorous quantum theory of atomic collisions in the presence of radio frequency (rf) magnetic fields is developed and applied to elucidate the effects of combined dc and rf magnetic fields on ultracold collisions of Rb atoms. We show that rf fields can be used to induce Feshbach resonances, which can be tuned by varying the amplitude and frequency of the rf field. The rf-induced Feshbach resonances occur also in collisions of atoms in low-field-seeking states at moderate rf field strengths easily available in atom chip experiments, which opens up the world of tunable interactions to magnetically trappable atomic quantummore » gases.« less