Bose-Einstein condensates in rf-dressed adiabatic potentials

White, Matthew; Gao, Huogui; Pasienski, Matt; DeMarco, Brian

doi:10.1103/physreva.74.023616

Cited by 62 publications

(60 citation statements)

References 11 publications

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“…In this paper, we show how adiabatic potentials for radio-frequency-(rf-) dressed states [15,16,17,18,19,20,21] can be used in a circular configuration. These dressed traps have recently been shown to provide long lifetimes, allow for evaporative cooling [22,23], and have been used to coherently split matter waves [17,24].…”

Section: Introductionmentioning

confidence: 99%

Dynamically controlled toroidal and ring-shaped magnetic traps

et al. 2007

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We present traps with toroidal (T 2 ) and ring-shaped topologies, based on adiabatic potentials for radio-frequency dressed Zeeman states in a ring-shaped magnetic quadrupole field. Simple adjustment of the radio-frequency fields provides versatile possibilities for dynamical parameter tuning, topology change, and controlled potential perturbation. We show how to induce toroidal and poloidal rotations, and demonstrate the feasibility of preparing degenerate quantum gases with reduced dimensionality and periodic boundary conditions. The great level of dynamical and even state dependent control is useful for atom interferometry.

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Section: Introductionmentioning

confidence: 99%

Dynamically controlled toroidal and ring-shaped magnetic traps

et al. 2007

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“…In our experiment we diffract an atomic matter wave from a microwave-dressed optical lattice, with a diffractive dynamics that is qualitatively different from Kapitza-Dirac diffraction of dressed matter waves from a periodic optical potential. We note that the coherent mixing of states interacting with an external field is often used for the engineering of dressed potentials [11][12][13][14][15][16][17][18][19]. Deviations from adiabaticity have previously been found to have deleterious effects on dressed-state lifetimes [20,21].…”

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confidence: 93%

Nonadiabatic diffraction of matter waves

et al. 2015

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Diffraction phenomena usually can be formulated in terms of a potential that induces the redistribution of a wave's momentum. Using an atomic Bose-Einstein condensate coupled to the orbitals of a state-selective optical lattice, we investigate a hitherto unexplored nonadiabatic regime of diffraction in which no diffracting potential can be defined, and in which the adiabatic dressed states are strongly mixed. We show how, in the adiabatic limit, the observed coupling between internal and external dynamics gives way to standard Kapitza-Dirac diffraction of atomic matter waves. We demonstrate the utility of our scheme for atom interferometry and discuss prospects for studies of dissipative superfluid phenomena.Diffraction, the bending of waves around obstacles, is one of the most fundamental and ubiquitous phenomena in optics, with a centuries-old history going back to the works of Grimaldi, Huygens, and Young on the wave nature of light. In the modern era it has led to the understanding of x-rays [1, 2], has provided direct proof for the wave nature of particles [3], and today finds many applications in physics and materials science, ranging from electron, x-ray and neutron diffraction, to applications in atom optics [4,5].Quite generally, diffraction is caused by a positiondependent potential with absorptive (imaginary) and/or dispersive (real) character. While the former includes material structures and diffraction gratings, an example for the latter is the ponderomotive potential exerted on electrons by an optical standing wave, as originally suggested by Kapitza and Dirac [6]. Kapitza-Dirac diffraction of electrons was first demonstrated only fairly recently [7], well after the first observation of an analogous effect on neutral atoms based on the ac Stark shift near an atomic resonance [8]. It has also been applied to Bose-Einstein condensates [9,10] and has become an important and often-used tool in atom interferometry and metrology [5].In this paper, we investigate a hitherto unexplored regime of diffraction, in which a diffracting potential cannot be defined. In our experiment we diffract an atomic matter wave from a microwave-dressed optical lattice, with a diffractive dynamics that is qualitatively different from Kapitza-Dirac diffraction of dressed matter waves from a periodic optical potential. We note that the coherent mixing of states interacting with an external field is often used for the engineering of dressed potentials [11][12][13][14][15][16][17][18][19]. Deviations from adiabaticity have previously been found to have deleterious effects on dressed-state lifetimes [20,21]. In our experiment, we enter the strongly nonadiabatic regime, in which coherent Landau-Zener transitions of the atomic wavefunction between the adiabatic dressed potentials (driven by zero-point motion) induce a strong coupling between internal and external degrees of freedom, leading to a breakdown of the usual BornOppenheimer (adiabatic) approximation [22]. Our experimental procedure, cf. Fig. 1a, uses microwave radiation ...

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“…Magnetically trapped atoms interacting with an rf-field is an extensively studied system due to its application in widely known cooling mechanism 'evaporative cooling' which facilitated the generation of the quantum degenerate state of matter known as Bose Einstein Condensate [3,4]. Another interesting application of this atomic system exists in trapping of atoms in non-trivial geometries using the rf-dressed potentials arising due to the creation of dressed states resulting from the interaction of atoms with the strong rf-fields [5][6][7][8]. All these cooling and trapping schemes based on the use of rf-radiation have mostly used the monochromatic rf-radiation [9][10][11], where the effect of a polychromatic rf-field is considered only to a limited extent [12,13].…”

Section: Introductionmentioning

confidence: 99%

Resonance enhancement of two photon absorption by magnetically trapped atoms in strong rf-fields

Chakraborty¹,

Mishra²

2018

Physics Letters A

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Applying a many mode Floquet formalism for magnetically trapped atoms interacting with a polychromatic rf-field, we predict a large two photon transition probability in the atomic system of cold 87 Rb atoms. The physical origin of this enormous increase in the two photon transition probability is due to the formation of avoided crossings between eigen-energy levels originating from different Floquet sub-manifolds and redistribution of population in the resonant intermediate levels to give rise to the resonance enhancement effect. Other exquisite features of the studied atom-field composite system include the splitting of the generated avoided crossings at the strong field strength limit and a periodic variation of the single and two photon transition probabilities with the mode separation frequency of the polychromatic rf-field. This work can find applications to characterize properties of cold atom clouds in the magnetic traps using rf-spectroscopy techniques.

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Bose-Einstein condensates in rf-dressed adiabatic potentials

Cited by 62 publications

References 11 publications

Dynamically controlled toroidal and ring-shaped magnetic traps

Dynamically controlled toroidal and ring-shaped magnetic traps

Nonadiabatic diffraction of matter waves

Resonance enhancement of two photon absorption by magnetically trapped atoms in strong rf-fields

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