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Title: Antiblockade in Rydberg Excitation of an Ultracold Lattice Gas

Abstract

It is shown that the two-step excitation scheme typically used to create an ultracold Rydberg gas can be described with an effective two-level rate equation, greatly reducing the complexity of the optical Bloch equations. This allows us to efficiently solve the many-body problem of interacting cold atoms with a Monte Carlo technique. Our results reproduce the observed excitation blockade effect. However, we demonstrate that an Autler-Townes double peak structure in the two-step excitation scheme, which occurs for moderate pulse lengths as used in the experiment, can give rise to an antiblockade effect. It is most pronounced for atoms arranged on a lattice. Since the effect is robust against a large number of lattice defects it should be experimentally realizable with an optical lattice created by CO{sub 2} lasers.

Authors:
; ;  [1];  [2]
  1. Max Planck Institute for the Physics of Complex Systems, Noethnitzer Strasse 38, D-01187 Dresden (Germany)
  2. ITAMP, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)
Publication Date:
OSTI Identifier:
20861597
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevLett.98.023002; (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; BLOCH EQUATIONS; CARBON DIOXIDE LASERS; CRYSTAL DEFECTS; EXCITATION; MANY-BODY PROBLEM; MONTE CARLO METHOD; RYDBERG STATES

Citation Formats

Ates, C., Pattard, T., Rost, J. M., and Pohl, T. Antiblockade in Rydberg Excitation of an Ultracold Lattice Gas. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.023002.
Ates, C., Pattard, T., Rost, J. M., & Pohl, T. Antiblockade in Rydberg Excitation of an Ultracold Lattice Gas. United States. doi:10.1103/PHYSREVLETT.98.023002.
Ates, C., Pattard, T., Rost, J. M., and Pohl, T. Fri . "Antiblockade in Rydberg Excitation of an Ultracold Lattice Gas". United States. doi:10.1103/PHYSREVLETT.98.023002.
@article{osti_20861597,
title = {Antiblockade in Rydberg Excitation of an Ultracold Lattice Gas},
author = {Ates, C. and Pattard, T. and Rost, J. M. and Pohl, T.},
abstractNote = {It is shown that the two-step excitation scheme typically used to create an ultracold Rydberg gas can be described with an effective two-level rate equation, greatly reducing the complexity of the optical Bloch equations. This allows us to efficiently solve the many-body problem of interacting cold atoms with a Monte Carlo technique. Our results reproduce the observed excitation blockade effect. However, we demonstrate that an Autler-Townes double peak structure in the two-step excitation scheme, which occurs for moderate pulse lengths as used in the experiment, can give rise to an antiblockade effect. It is most pronounced for atoms arranged on a lattice. Since the effect is robust against a large number of lattice defects it should be experimentally realizable with an optical lattice created by CO{sub 2} lasers.},
doi = {10.1103/PHYSREVLETT.98.023002},
journal = {Physical Review Letters},
number = 2,
volume = 98,
place = {United States},
year = {Fri Jan 12 00:00:00 EST 2007},
month = {Fri Jan 12 00:00:00 EST 2007}
}