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Localization of a Three-Level Cascade Atom via Resonant Absorption

Chinese Physics Letters 2007年第9期24卷 2583-2586页

作者：沈文炳徐俊胡响明 Department of Physics Huazhong Normal University Wuhan 430079

We show that it is possible to localize a three-level cascade atom under the resonance condition when it passes through a standing-wave field. The localization peaks appear at the nodes of the standing-wave field, the detecting probability is 50% in the subwavelength domain, and the peaks are narrower on the resonance than the off- resonance. The absorption is the same as that in the usual two-level medium at the nodes and is greatly suppressed outside the nodes due to the Autler-Townes splitting. This is in sharp contrast to the lambda scheme, in which the localization is impossible under the same resonance condition due to the depletion of population of the initial state by the probe field at the nodes and the electromagnetically induced transparency outside the nodes.

关键词： BOSE-EINSTEIN CONDENSATION QUANTUM NONDEMOLITION MEASUREMENT AUTLER-TOWNESMICROSCOPY POSITION MEASUREMENT neutral atoms PHASE-CONTROL SINGLE-ATOM DIFFRACTION INTERFERENCE SPECTRUM

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Controllable Magnetic Focusing of Cold atoms on a Chip

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Chinese Physics Letters 2006年第7期23卷 1698-1701页

作者：刘泱恽旻印建平 Key Laboratory for Optically and Magnetic Resonance Spectroscopy Department of Physics East China Normal University Shanghai 200062

We propose a new lens scheme to focus cold atoms by using a controllable inhomogeneous magnetic field from a square current-carrying wire fabricated on a chip. The spatial distributions of the magnetic field are calculated, and the results show that the generated magnetic field is a two-dimensional （2D） quadrupole one and can be used to focus cold atoms or a cold atomic beam. The dynamic processes of cold atoms passing through our square wire layout and its focusing properties are studied by using Monte Carlo simulations. Our study shows that the atomic clouds can be focused effectively by our magnetic lens scheme, and the focal length of the atomic lens and its radius of focused spot can be continuously changed by adjusting the current in the wires.

关键词： BOSE-EINSTEIN CONDENSATION neutral atoms HOLLOW-BEAM LIGHT MICROMANIPULATION FORCES MIRROR OPTICS FUNNEL TRAPS

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Non-Equilibrium Quantum Transport of Bosons through a Quantum Dot

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Chinese Physics Letters 2006年第8期23卷 2008-2011页

作者：陈佐子吕嵘翟荟张礼 Center for Advanced Study Tsinghua University Beijing 100084 Department of Physics the Ohio-State University Columbus 43210 Ohio USA

The quantum dot coupled to reservoirs is known as a typical mesoscopic setup to manifest the quantum characteristics of particles in transport. In analogue to many efforts made on the study of electronic quantum dots in the past decades, we study the transport of bosons through such a device. We first generalize the formula which relates the current to the local properties of dot in the bosonic situation. Then, as an illustrative example, we calculate the local density of state and lesser Green function of the localized boson with a bosonic Fano-Anderson model. The current-voltage （I - V） behaviour at zero temperature is presented, and in the bosonic dot it is the I - V curve, in contrast to the differential conductance in the electronic dot, which is found to be proportional to the spectral function.

关键词： neutral atoms

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A Radio Frequency Field Guide Using Field Induced Adiabatic Potential

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Chinese Physics Letters 2007年第5期24卷 1260-1263页

作者：颜波李晓林柯敏王育竹 Key Laboratory for Quantum Optics Center for Cold Atom Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

We study the behaviour of atoms in a field with both static magnetic field and radio frequency （rf） magnetic field. We calculate the adiabatic potential of atoms numerically beyond the usually rotating wave approximation, and it is pointed that there is a great difference between using these two methods. We find the preconditions when RWA is valid. In the extreme of static field almost parallel to rf field, we reach an analytic formula. Finally, we apply this method to 87 Rb and propose a guide based on an rf field on atom chip.

关键词： BOSE-EINSTEIN CONDENSATION neutral atoms SODIUM atoms

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