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Search Publications by

Ian Spielman (Fed)

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Displaying 1 - 25 of 93

Dynamical Instability of 3d Stationary and Traveling Planar Dark Solitons

November 9, 2022
Ian Spielman, Amilson R. Fritsch, T. Mithun, Panayotis Kevrekidis
Here we revisit the topic of stationary and propagating solitonic excitations in self-repulsive three-dimensional Bose-Einstein condensates by quantitatively comparing theoretical analysis and associated numerical computations with our experimental results

Floquet engineering topological Dirac bands

July 22, 2022
Ian Spielman, Mingwu Lu, Amilson R. Fritsch, Graham Reid, Alina Pineiro Escalera
We experimentally realized a time-periodically modulated 1D lattice for ultracold atoms featuring a pair of linear bands, each associated with a Floquet winding number: a topological invariant. These bands are spin-momentum locked and almost perfectly

Accurate Determination of Hubble Attenuation and Amplification in Expanding and Contracting Cold-Atom Universes

February 28, 2022
Swarnav Banik, Monica Gutierrez Galan, Hector Sosa Martinez, 1, Madison Anderson, Stephen Eckel, Ian Spielman, Gretchen K. Campbell
In the expanding universe, relativistic scalar fields are thought to be attenuated by "Hubble friction," which results from the dilation of the underlying spacetime metric. By contrast, in a contracting universe this pseudofriction would lead to

Wilson loop and Wilczek-Zee phase from a non-Abelian gauge field

September 30, 2021
Ian Spielman, Francisco Salces Carcoba, Andika Putra, Yuchen Yue, Seiji Sugawa
Quantum states can acquire a geometric phase called the Berry phase after adiabatically traversing a closed loop, which depends on the path not the rate of motion. The Berry phase is analogous to the Aharonov–Bohm phase derived from the electromagnetic

Machine-learning enhanced dark soliton detection in Bose-Einstein condensates

June 15, 2021
Shangjie Guo, Amilson R. Fritsch, Ian Spielman, Justyna Zwolak
Most data in cold-atom experiments comes from images, the analysis of which is limited by our preconceptions of the patterns that could be present in the data. We focus on the well-defined case of detecting dark solitons—appearing as local density

Coherence and decoherence in the Harper-Hofstadter model

May 19, 2021
Ian Spielman, Qiyu Liang, Dimi Trypogeorgos, Ana Valdes-Curiel, Junheng Tao, Mingshu Zhao
We quantum simulated the 2D Harper-Hofstadter (HH) lattice model in a highly elongated tube geometry—three sites in circumference—using an atomic Bose-Einstein condensate. In addition to the usual transverse (out-of-plane) magnetic flux, piercing the

Multiple-camera defocus imaging of ultracold atomic gases

May 13, 2021
Ian Spielman, Francisco Salces Carcoba, Yuchen Yue, Seiji Sugawa, Abigail Perry
In cold atom experiments, each image of light refracted and absorbed by an atomic ensemble carries a remarkable amount of information. Numerous imaging techniques including absorption, fluorescence, and phase-contrast are commonly used. Other techniques

Feedback Induced Magnetic Phases in Binary Bose-Einstein Condensates

December 7, 2020
Ian B. Spielman, Shangjie Guo, Hilary M. Hurst
Weak measurement in tandem with real-time feedback control is a new route toward engineering novel non-equilibrium quantum matter. Here we develop a theoretical toolbox for quantum feedback control of multicomponent Bose-Einstein condensates (BECs) using

Enhanced transport of spin-orbit coupled Bose gases in disordered potentials

September 17, 2020
Yuchen Yue, Ian Spielman, Carlos S? de Melo
Anderson localization is single particle localization phenomena in disordered media that is accompanied by an absence of diffusion. Spin-orbit coupling (SOC) describes an interaction between a particle's spin and its momentum that directly affects its

Creating solitonic excitations with controllable velocity in Bose-Einstein condensates

May 20, 2020
Amilson R. Fritsch, Mingwu Lu, Alina M. Pineiro Escalera, Graham H. Reid, Ian Spielman
Established techniques for deterministically creating dark solitons in repulsively interacting atomic Bose-Einstein condensates (BECs) can only access a narrow range of soliton velocities. Because velocity a ects the stability of individual solitons and

Realization of a deeply subwavelength adiabatic optical lattice

February 12, 2020
Ian B. Spielman, Ana Valdes Curiel, Russell P. Anderson, T. Andrijauskas, Gediminas Juzeliunas, Qiyu Liang, Junheng Tau, Dimitrius Trypogeorgos, Mingshu Zhao
We propose and realize a deeply sub-wavelength optical lattice for ultracold neutral atoms using $N$ resonantly Raman-coupled internal degrees of freedom. Although counter-propagating lasers with wavelength $\lambda$ provided two-photon Raman coupling, the

Repeated Measurements with Minimally Destructive Partial-Transfer Absorption Imaging

December 2, 2019
Ian B. Spielman, Ana Valdes Curiel, Dimitris Trypogeorgos, Erin Marshall, Nathan Lundblad
We demonstrate partial-transfer absorption imaging as a technique for repeatedly imaging an ultracold atomic ensemble with minimal perturbation. We prepare an atomic cloud in a state that is dark to the imaging light and then use a microwave pulse to

Exceeding the Sauter-Schwinger limit of pair production with a quantum gas

September 21, 2019
Alina M. Pineiro Escalera, Mingwu Lu, Dina Genkina, Ian Spielman
We quantum-simulated particle-antiparticle pair production with a bosonic quantum gas in an optical lattice by emulating the requisite 1d Dirac equation and uniform electric field. We emulated field strengths far in excess of Sauter-Schwinger's limit for

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

May 16, 2019
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
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
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
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
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
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
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