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Search Publications by: Ian Spielman ()

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Displaying 26 - 50 of 102

Spin-orbit coupled bosons in one dimension: Emergent gauge field and Lifshitz transition

May 16, 2019
Author(s)
Ian B. Spielman, William Cole, Junhyun Lee, Khan Mahmud, Yahya Alavirad, Jay Sau
We propose the two component spin-orbit coupled Bose liquid as a platform for studying quantum criticality in itinerant magnets. Apart from being pervasive in the solid state, quantum critical fluctuations in such itinerant systems often involve the

Imaging topology of Hofstadter ribbons

May 8, 2019
Author(s)
Ian B. Spielman, Dina Genkina, Alina M. Pineiro Escalera, Hsin-I Lu, Lauren Aycock
Physical systems with non-trivial topological order find direct applications in metrology[1] and promise future applications in quantum computing[2,3]. The quantum Hall effect derives from transverse conductance, quantized to unprecedented precision in

Topological Bands for Ultracold Atoms

March 25, 2019
Author(s)
Ian B. Spielman, Nigel Cooper, Jean Dalibard
There have been significant recent advances in realizing bandstructures with geometrical and topological features in experiments on cold atomic gases. We provide an overview of these developments, beginning with a summary of the key concepts of geometry

Artificial gauge fields with ultracold neutral atoms

January 1, 2019
Author(s)
Ian B. Spielman, Victor Galitski, Gediminas Juzeliunas
Gauge fields are ubiquitous in nature. In the context of quantum electrodynamics, you may be familiar with the photon, that represents the dynamical gauge field mediating electromagnetic forces. In fact all elementary interactions are mediated by gauge

Perpetual emulation threshold of PT-symmetric Hamiltonians

June 29, 2018
Author(s)
Ian B. Spielman, Clive Emary, Dimitris Trypogeorgos, Ana Vald?s-Curiel
We describe a technique to emulate a two-level PT-symmetric spin Hamiltonian, replete with gain and loss, using only the unitary dynamics of a larger quantum system. This we achieve by embedding the two-level system in question in a subspace of a four

Second Chern number of a quantum-simulated non-Abelian Yang monopole

June 29, 2018
Author(s)
Ian B. Spielman, Francisco Salces Carcoba, Yuchen Yue, Abigail Perry, Seiji Sugawa
Topological order is often quantified in terms of Chern numbers, each of which classifies a topological singularity. Here, inspired by concepts from high-energy physics, we use quantum simulation based on the spin degrees of freedom of atomic Bose-Einstein

A supersonically expanding Bose-Einstein condensate: an expanding universe in the lab

April 19, 2018
Author(s)
Stephen P. Eckel, Avinash Kumar, Theodore Jacobson, Ian B. Spielman, Gretchen K. Campbell
We study the dynamics of a supersonically expanding Bose-Einstein ring condensate both experimentally and theoretically using simulations. Such expansion shows a redshift of long-wavelength excitations, similar to those seen in the standard cosmological

Topological lattice using multi-frequency radiation

March 19, 2018
Author(s)
Ian B. Spielman, Gediminas Juzeli?nas, Tomas Andrijauskas
We describe a novel technique for creating an artificial magnetic field for ultra-cold atoms using a periodically pulsed pair of counter propagating Raman lasers that drive transitions between a pair of internal atomic spin states: a multi-frequency

Synthetic clock transitions via continuous dynamical decoupling

January 16, 2018
Author(s)
Ian B. Spielman, Nathan Lundblad, Ana Valdes-Curiel, Dimitrius Trypogeorgos
Decoherence of quantum systems due to uncontrolled fluctuations of the environment presents fundamental obstacles in quantum science. `Clock' transitions which are insensitive to such fluctuations are used to improve coherence, however, they are not

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

December 26, 2017
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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
Author(s)
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