Andrei I. Sidorov
Swinburne University of Technology
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Featured researches published by Andrei I. Sidorov.
Journal of Physics B | 2008
Mandip Singh; M. Volk; Alexander M. Akulshin; Andrei I. Sidorov; Russell J. McLean; Peter Hannaford
We report on the loading and trapping of ultracold atoms in a one-dimensional permanent magnetic lattice of period 10 µm produced on an atom chip. The grooved structure which generates the magnetic lattice potential is fabricated on a silicon substrate and coated with a perpendicularly magnetized multilayered TbGdFeCo/Cr film of effective thickness 960 nm. Ultracold atoms are evaporatively cooled in a Z-wire magnetic trap and then adiabatically transferred to the magnetic lattice potential by applying an appropriate bias field. Under our experimental conditions trap frequencies of up to 90 kHz in the magnetic lattice are measured and the atoms are trapped at a distance of less than 5 µm from the surface with a measured lifetime of about 450 ms. These results are important in the context of studies of quantum coherence of neutral atoms in periodic magnetic potentials on an atom chip.
Physical Review Letters | 2007
B. V. Hall; S. Whitlock; R. P. Anderson; Peter Hannaford; Andrei I. Sidorov
We report on the adiabatic splitting of a BEC of
Journal of Physics B | 2006
Saeed Ghanbari; Tien D. Kieu; Andrei I. Sidorov; Peter Hannaford
^{87}
Quantum and Semiclassical Optics: Journal of The European Optical Society Part B | 1996
Andrei I. Sidorov; Russell J. McLean; W J Rowlands; Darwin Lau; J E Murphy; M Walkiewicz; Geoffrey I. Opat; Peter Hannaford
Rb atoms by an asymmetric double-well potential located above the edge of a perpendicularly magnetized TbGdFeCo film atom chip. By controlling the barrier height and double-well asymmetry the sensitivity of the axial splitting process is investigated through observation of the fractional atom distribution between the left and right wells. This process constitutes a novel sensor for which we infer a single shot sensitivity to gravity fields of
Physical Review Letters | 2011
Andreas Trenkwalder; C. Kohstall; Matteo Zaccanti; D. Naik; Andrei I. Sidorov; Florian Schreck; R. Grimm
\delta g/g\approx2\times10^{-4}
Physical Review A | 2011
Mikhail Egorov; R. P. Anderson; Valentin Ivannikov; Bogdan Opanchuk; P. D. Drummond; B. V. Hall; Andrei I. Sidorov
. From a simple analytic model we propose improvements to chip-based gravity detectors using this demonstrated methodology.
Physical Review A | 2009
R. P. Anderson; Christopher Ticknor; Andrei I. Sidorov; B. V. Hall
We propose the use of periodic arrays of permanent magnetic films for producing magnetic lattices of microtraps for confining, manipulating and controlling small clouds of ultracold atoms and quantum degenerate gases. Using analytical expressions and numerical calculations we show that periodic arrays of magnetic films can produce one-dimensional (1D) and two-dimensional (2D) magnetic lattices with non-zero potential minima, allowing ultracold atoms to be trapped without losses due to spin flips. In particular, we show that two crossed layers of periodic arrays of parallel rectangular magnets plus bias fields, or a single layer of periodic arrays of square-shaped magnets with three different thicknesses plus bias fields, can produce 2D magnetic lattices of microtraps having non-zero potential minima and controllable trap depth. For arrays with micron-scale periodicity, the magnetic microtraps can have very large trap depths (~0.5 mK for the realistic parameters chosen for the 2D lattice) and very tight confinement.
Journal of Physics B | 2006
B. V. Hall; S. Whitlock; F. Scharnberg; Peter Hannaford; Andrei I. Sidorov
We have observed specular reflection and multiple bounces of a beam of laser-cooled caesium atoms from a magnetostatic mirror consisting of an array of rare-earth permanent magnets. Using a time-of-flight absorption technique, the reflection coefficient of the mirror for caesium atoms pumped toward the m=+4 state is determined to be . For a beam of unpolarized atoms the reflectivity is found to be unexpectedly high, , which is attributed to contributions from atoms in m = 0, -1, -2 states which are reflected at high magnetic fields close to the surface of the mirror as a result of the quadratic Zeeman effect.
Optics Communications | 1984
V.O. Balykin; V. S. Letokhov; Andrei I. Sidorov
We report on the expansion of an ultracold Fermi-Fermi mixture of (6)Li and (40)K under conditions of strong interactions controlled via an interspecies Feshbach resonance. We study the expansion of the mixture after release from the trap and, in a narrow magnetic-field range, we observe two phenomena related to hydrodynamic behavior. The common inversion of the aspect ratio is found to be accompanied by a collective effect where both species stick together and expand jointly despite of their widely different masses. Our work constitutes a major experimental step for a controlled investigation of the many-body physics of this novel strongly interacting quantum system.
Journal of Optics B-quantum and Semiclassical Optics | 2004
Alexander M. Akulshin; Andrei I. Sidorov; Russell J. McLean; Peter Hannaford
We observe the coherence of an interacting two-component Bose-Einstein condensate (BEC) surviving for seconds in a trapped Ramsey interferometer. Mean-field-driven collective oscillations of two components lead to periodic dephasing and rephasing of condensate wave functions with a slow decay of the interference fringe visibility. We apply spin echo synchronous with the self-rephasing of the condensate to reduce the influence of state-dependent atom losses, significantly enhancing the visibility up to 0.75 at the evolution time of 1.5 s. Mean-field theory consistently predicts higher visibility than experimentally observed values. We quantify the effects of classical and quantum noise and infer a coherence time of 2.8 s for a trapped condensate of 5.5x10{sup 4} interacting atoms.