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Search Publications by

Ian Spielman (Fed)

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Displaying 26 - 50 of 91

Quantum Phases of Two-Component Bosons with Spin-Orbit Coupling in Optical Lattices

December 26, 2017
Ian B. Spielman, Carlos S? de Melo, Daisuke Yamamoto
Ultracold bosons in optical lattices are one of the few systems where bosonic matter is known to exhibit strong correlations. Here, to push the frontier of our understanding of interacting bosons in optical lattices, we add synthetic spin-orbit coupling

Quantum theory solved by experiment

May 18, 2017
Ian B. Spielman
Systems of quantum objects can be characterized by the correlations between the objects. A technique has been developed to precisely measure even the most delicate correlations, allowing theoretical models of quantum systems to be tested. See Schweigler et

Kinetic theory of dark solitons with tunable friction

May 3, 2017
Ian B. Spielman, Hilary Hurst, Victor Galitski
We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose- Einstein condensate coupled to a non-interacting Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the

Bose-Einstein Condensates in Artificial Gauge Fields

May 1, 2017
Ian B. Spielman, Lindsay LeBlanc
Quantum mechanically, static or applied gauge fields manifest themselves by directly coupling to a system's phase. Artificial gauge field techniques manipulate the phase of a Bose-Einstein condensates's order parameter, yielding effects present in

Fourier transform spectroscopy of a spin-orbit coupled Bose gas

March 16, 2017
Ian B. Spielman, Erin Marshall, Dimitry Trypogeorgos, Ana ValdCuriel
We describe a Fourier transform spectroscopy technique for directly measuring band structures, and apply it to a spin-1 spin-orbit coupled Bose-Einstein condensate. In our technique, we suddenly change the systems Hamiltonian by adding a spin- orbit

Impurity driven Brownian motion of solitons in elon- gated Bose-Einstein Condensates

March 7, 2017
Ian B. Spielman, Lauren M. Aycock, Dina Genkina, Hsin I Lu, Hilary Hurst, Victor Galitski
Solitons, spatially-localized, propagating excitations resulting from an interplay be- tween nonlinearity and dispersion, are ubiquitous in physical systems from water channels1 and oceans2 to optical fibers3 and Bose- Einstein condensates (BECs)4. For the

Semisynthetic zigzag optical lattice for ultracold bosons

December 22, 2016
Ian B. Spielman, Gediminas Juzeli?nas, Christoph Str?ter, Andr? Eckardt, Mantas Ra?i?nas, Egidijus Anisimovas
We consider a one-dimensional "zigzag" lattice, pictured as a two-site wide single strip taken from a triangular lattice, affected by a tunable homogeneous magnetic flux piercing its triangular plaquettes. We focus on a semi-synthetic lattice produced by

Real space mean-field theory of a spin-1 Bose gas in synthetic dimensions

December 15, 2016
Ian B. Spielman, Justin H. Wilson, Hilary Hurst, Jed Pixley, Stefan Natu
The internal degrees of freedom provided by ultracold atoms give a route for realizing higher dimensional physics in systems with limited spatial dimensions. Non-spatial degrees of freedom in these systems are dubbed “synthetic dimensions”. This connection

Synthetic gauge potentials for ultracold neutral atoms

November 23, 2016
Ian B. Spielman, Yu-Ju Lin
Synthetic gauge fields for ultracold neutral atoms—engineered using the interaction between laser fields and the atoms' internal 'spin' degrees of freedom—provide promising techniques for generating the large (synthetic) magnetic fields required to reach

Vortex nucleation in a Bose–Einstein condensate: from the inside out

November 23, 2016
Ian B. Spielman, Daniel Campbell, Ryan Price, Andika Putra, Dimitrius Trypogeorgos, Ana Vald?Curiel
We observed a new mechanism for vortex nucleation in Bose–Einstein condensates (BECs) subject to synthetic magnetic fields. We made use of a strong synthetic magnetic field initially localized between a pair of merging BECs to rapidly create vortices in

Geometrical pumping with a Bose-Einstein condensate

May 20, 2016
Lauren M. Aycock, Dina Genkina, Seiji Sugawa, Max Schemmer, Hsin I Lu, Ian Spielman
We realized a quantum "charge" pump for a Bose-Einstein condensate (BEC) in a novel bipartite magnetic lattice, whose bands are characterized by non-trivial topological invariants: the Zak phases. For each band, the Zak phase is determined by that band's

Interaction driven exotic quantum phases in spin-orbit coupled lattice spin?1 bosons

May 19, 2016
Ian B. Spielman, Jedediah Pixley, Stefan Natu, Sankar Das Sarma
We study the interplay between large-spin, spin-orbit coupling, and superfluidity for bosons in a two dimensional optical lattice, focusing on the spin-1 spin-orbit coupled system recently realized at the Joint Quantum Institute [Campbell et. al., arXiv

Visualizing edge states with an atomic Bose gas in the quantum Hall regime

May 19, 2016
Ian B. Spielman, Ben Stuhl, Hsin I Lu, Lauren M. Aycock, Dina Genkina
We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux $\approx4/3$ times the flux quanta. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip. Further

Rashba realization: Raman with RF

May 2, 2016
Ian B. Spielman, Daniel Campbell
We theoretically explore a Rashba spin-orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can

Magnetic phases of spin-1 spin–orbit-coupled Bose gases

May 1, 2016
Ian B. Spielman, Daniel Campbell, Ryan Price, Ana Valdes-Curiel, Andika Putra, Dimitrius Trypogeorgos
Phases of matter are characterized by order parameters describing the type and degree of order in a system. Here we experimentally explore the magnetic phases present in a near-zero temperature spin-1 spin–orbit-coupled atomic Bose gas and the quantum

Spin-Orbit Coupled Bose-Einstein Condensates

April 15, 2016
Yu-Ju Lin, Karina K. Jimenez Garcia, Ian B. Spielman
Spin-orbit (SO) coupling -- the interaction between a quantum particle's spin and its momentum -- is ubiquitous in nature, from atoms to solids. In condensed matter systems, SO coupling is crucial for the spin-Hall effect and topological insulators; it

Quantum and Classical Dynamics of BEC in a Large-Period Optical Lattice

April 4, 2016
Ian B. Spielman, Johnny H. Huckans, Bruno Laburthe-Tolra, James V. Porto, William D. Phillips
We experimentally investigate diffraction of a ^u87 Rb Bose-Einstein Condensate from a 1D optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to quantum mechanical and

Direct observation of Feshbach enhanced s-wave scattering of fermions

December 17, 2015
Dina Genkina, Lauren M. Aycock, Hsin I Lu, Ian B. Spielman, Benjamin K. Stuhl
We directly measured the s-wave scattering cross-section of ultracold 40K atoms across the 20.2 mT Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. Owing to DFG’s low density, few atoms scattered, even

Three-level Haldane-like model on a dice optical lattice

September 21, 2015
Ian B. Spielman, T. Andrijauskas, E. Anisimovas, M. Raciunas, A. Mekys, V. Kudriasov, G. Juzeliunas
We consider ultracold atoms in a two-dimensional optical lattice of the dice geometry in a tight-binding regime. The atoms experience a laser-assisted tunneling between the nearest neighbor sites of the dice lattice accompanied by the momentum recoil. This

Gauge matters: Observing the vortex-nucleation transition in a Bose condensate

June 18, 2015
Ian B. Spielman, LeBlanc Lindsey, Karina Jimenez-Garcia, Ross Williams, Matthew Beeler, William D. Phillips
The order parameter of a quantum-coherent many-body system includes one or more phase degrees of freedom, which, owing to the phase information's relationship to velocity, can be accessed using time-of-flight (TOF) imaging. Here, trapped Bose-Einstein

Assembling a complex quantum ensemble

April 10, 2015
Ian B. Spielman
Statistical mechanics provides a systematic approach for predicting the behavior of systems when only partial information is present. The key assumption underlying all of statistical mechanics is that every allowed configuration of the system, called a

Position-dependent spin-orbit coupling for ultracold atoms

February 18, 2015
Ian B. Spielman, Shih Wei Su, Shih-Chuan Gou, Ihe-Kau Liu, Luis Santos, Arturas Acus, Algirdas Mekys, Gediminas Juzeliunas
We theoretically explore atomic Bose-Einstein condensates (BECs) subject to position-dependent spin-orbit coupling (SOC). This SOC can be produced by cyclically Raman coupling four internal atomic ground (or metastable) states in an environment where the

Tunable Spin-Orbit Coupling via Strong Driving in Ultracold Atom Systems

December 12, 2014
Ian B. Spielman, Lindsay J. LeBlanc, Ross A. Williams, Matthew C. Beeler, Chunlei Qu, Ming Gong, Chuanwei Zhang
Spin-orbit coupling (SOC) is an essential ingredient in topological materials, conventional and quantum-gas based alike. Engineered spin-orbit coupling in ultracold atom systems unique in their experimental control and measurement opportunities provides a