CQuIC Seminars
Use of vector polarizability to manipulate alkali-metal atoms
Presented by D. Cho, Korea University
AC Stark shift of an alkali-metal atom in a laser beam has a Zeeman-like term, which is pro-
portional to the vector polarizability , in addition to a usual scalar ( ) term. I will discuss a few
experiments using to manipulate ground-state alkali-metal atoms:
(i) When the laser is circularly polarized and properly tuned between the D1 and D2 transitions,
the term vanishes and the Stark shift takes the form of a pure Zeeman shift. We constructed an
optical analog of a magnetic trap and carried out an optical Stern-Gerlach experiment.
(ii) For the atoms in an optical trap, a differential ac Stark shift of a ground-hyper ne transition can
be tuned out by adjusting polarization of the trapping eld. By using the magic polarization" for
7Li, we achieved 0.6 Hz linewidth. I will describe how we use the capability to manipulate atoms
in an optical lattice in a site-speci c manner.
(iii) In a circularly-polarized optical trap, hyper ne-transition frequency of an atom depends on the
vibrational quantum number n. I will describe our experiments to develop new schemes to cool
optically trapped atoms using the n-dependence: RF-induced evaporative cooling in an optical
trap and motion-selective" CPT cooling which is analogous to the velocity-selective CPT cooling.
4:00 pm, Wednesday, August 21, 2019
PAIS-2540, PAIS
Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: physics@unm.edu) well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.
A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at http://physics.unm.edu/pandaweb/events/index.php