Dark State Optical Lattice with a Subwavelength Spatial Structure

We report on the experimental realization of a conservative optical lattice for cold atoms with a subwavelength spatial structure. The potential is based on the nonlinear optical response of three-level atoms in laser-dressed dark states, which is not constrained by the diffraction limit of the light generating the potential. The lattice consists of a one-dimensional array of ultranarrow barriers with widths less than 10 nm, well below the wavelength of the lattice light, physically realizing a Kronig-Penney potential. We study the band structure and dissipation of this lattice and find good agreement with theoretical predictions. Even on resonance, the observed lifetimes of atoms trapped in the lattice are as long as 44 ms, nearly 105 times the excited state lifetime, and could be further improved with more laser intensity. The potential is readily generalizable to higher dimensions and different geometries, allowing, for example, nearly perfect box traps, narrow tunnel junctions for atomtronics applications, and dynamically generated lattices with subwavelength spacings.

[1]  I. Bloch,et al.  Quantum simulations with ultracold atoms in optical lattices , 2017, Science.

[2]  Liang Jiang,et al.  Subwavelength-width optical tunnel junctions for ultracold atoms. , 2016, Physical review. A.

[3]  P. Zoller,et al.  Nanoscale "Dark State" Optical Potentials for Cold Atoms. , 2016, Physical review letters.

[4]  S. Rolston,et al.  Degenerate Bose-Fermi mixtures of rubidium and ytterbium , 2015, 1506.08705.

[5]  N. Goldman,et al.  Dynamic Optical Lattices of Subwavelength Spacing for Ultracold Atoms. , 2015, Physical review letters.

[6]  B. Demarco,et al.  Simulation of Anderson localization in two-dimensional ultracold gases for pointlike disorder , 2015, 1505.01836.

[7]  D. E. Chang,et al.  Subwavelength vacuum lattices and atom–atom interactions in two-dimensional photonic crystals , 2014, Nature Photonics.

[8]  C. Clark,et al.  Hysteresis in a quantized superfluid ‘atomtronic’ circuit , 2014, Nature.

[9]  Deniz Yavuz,et al.  Subwavelength Localization of Atomic Excitation Using Electromagnetically Induced Transparency , 2013 .

[10]  N. Goldman,et al.  Light-induced gauge fields for ultracold atoms , 2013, Reports on progress in physics. Physical Society.

[11]  Alexander L. Gaunt,et al.  Bose-Einstein condensation of atoms in a uniform potential. , 2012, Physical review letters.

[12]  J I Cirac,et al.  Nanoplasmonic lattices for ultracold atoms. , 2012, Physical review letters.

[13]  S. Rolston,et al.  Precision measurement of transition matrix elements via light shift cancellation. , 2012, Physical review letters.

[14]  J. Dalibard,et al.  Colloquium: Artificial gauge potentials for neutral atoms , 2010, 1008.5378.

[15]  F. Gerbier,et al.  Heating rates for an atom in a far-detuned optical lattice , 2010, 1002.5018.

[16]  J. Dalibard,et al.  Geometric potentials in quantum optics: A semi-classical interpretation , 2008, 0807.4066.

[17]  J. Evers,et al.  Resonant interferometric lithography beyond the diffraction limit. , 2008 .

[18]  P. Zoller,et al.  State-dependent, addressable subwavelength lattices with cold atoms , 2008, 0801.0600.

[19]  N. Lundblad,et al.  Atoms in a radio-frequency-dressed optical lattice. , 2008, Physical review letters.

[20]  R. Ciuryło,et al.  Two-color photoassociation spectroscopy of ytterbium atoms and the precise determinations of s -wave scattering lengths , 2007, 0708.0752.

[21]  M. Weitz,et al.  Atomic Landau-Zener tunneling in Fourier-synthesized optical lattices. , 2007, Physical review letters.

[22]  P. Zoller,et al.  Coherent quantum optical control with subwavelength resolution. , 2007, Physical review letters.

[23]  Jaeyoon Cho.  Addressing individual atoms in optical lattices with standing-wave driving fields. , 2007, Physical review letters.

[24]  M. Weitz,et al.  Fourier synthesis of optical potentials for atomic quantum gases , 2005, cond-mat/0512018.

[25]  C. Sackett,et al.  Compact implementation of a scanning transfer cavity lock , 2005 .

[26]  M. S. Zubairy,et al.  Subwavelength atom localization via amplitude and phase control of the absorption spectrum-II , 2005, quant-ph/0509068.

[27]  S. Dutta,et al.  Tunneling Dynamics and Gauge Potentials in Optical Lattices , 1999 .

[28]  M. Olshanii,et al.  Gauge structures in atom-laser interaction: Bloch oscillations in a dark lattice. , 1996, Physical review letters.

[29]  Phillips,et al.  Adiabatic cooling of cesium to 700 nK in an optical lattice. , 1995, Physical review letters.

[30]  J. Gordon,et al.  Motion of atoms in a radiation trap , 1980 .

[31]  W. Penney,et al.  Quantum Mechanics of Electrons in Crystal Lattices , 1931 .

[32]  W. Marsden.  I and J , 2012 .