Publications (37)
Experimental realization of a non-magnetic one-way spin switch
M. E. Mossman, Junpeng Hou, Xi-Wang Luo +2
Controlling magnetism through non-magnetic means is highly desirable for future electronic devices, as such means typically have ultra-low power requirements and can provide cohere…
Lattice dynamics in an emergent Zeeman lattice
M. K. H. Ome, Huaxin He, A. Mukhopadhyay +5
Periodic band structures are a hallmark phenomenon of condensed matter physics. While often imposed by external potentials, periodicity can also arise through the interplay of coup…
Phase Winding a Two-Component BEC in an Elongated Trap: Experimental Observation of Moving Magnetic Orders and Dark-bright Solitons
C. Hamner, Yongping Zhang, J. J. Chang +2
We experimentally investigate the phase winding dynamics of a harmonically trapped two-component BEC subject to microwave induced Rabi oscillations between two pseudospin component…
On Dispersive and Classical Shock Waves in Bose-Einstein Condensates and Gas Dynamics
M. A. Hoefer, M. J. Ablowitz, I. Coddington +3
A Bose-Einstein condensate (BEC) is a quantum fluid that gives rise to interesting shock wave nonlinear dynamics. Experiments depict a BEC that exhibits behavior similar to that of…
The piston dispersive shock wave problem
M. A. Hoefer, M. J. Ablowitz, P. Engels
The one-dimensional piston shock problem is a classical result of shock wave theory. In this work, the analogous dispersive shock wave (DSW) problem for a dispersive fluid describe…
Stationary and non-stationary fluid flow of a Bose-Einstein condensate through a penetrable barrier
P. Engels, C. Atherton
We experimentally study the fluid flow induced by a broad, penetrable barrier moving through an elongated dilute gaseous Bose-Einstein condensate. The barrier is created by a laser…
Dark-dark solitons and modulational instability in miscible, two-component Bose-Einstein condensates
M. A. Hoefer, J. J. Chang, C. Hamner +1
We investigate the dynamics of two miscible superfluids experiencing fast counterflow in a narrow channel. The superfluids are formed by two distinguishable components of a trapped…
Observation of vector rogue waves in repulsive three-component atomic mixtures
G. A. Bougas, G. C. Katsimiga, S. Mossman +3
We report the experimental observation of vector extensions of Peregrine solitons in highly particle-imbalanced, pairwise immiscible three-component repulsive Bose-Einstein condens…
Scattering of atomic dark-bright solitons from narrow impurities
A. Ãlvarez, J. Cuevas, F. R. Romero +5
In this work, we study the collision of an atomic dark-bright soliton, in a two-component Bose-Einstein condensate, with a Gaussian barrier or well. First, we present the results o…
Multiple dark-bright solitons in atomic Bose-Einstein condensates
D. Yan, J. J. Chang, C. Hamner +6
We present experimental results and a systematic theoretical analysis of dark-br ight soliton interactions and multiple-dark-bright soliton complexes in atomic t wo-component Bose-…
Observation of Long-lived Vortex Aggregates in Rapidly Rotating Bose-Einstein Condensates
P. Engels, I. Coddington, P. C. Haljan +2
We study the formation of large vortex aggregates in a rapidly rotating dilute-gas Bose-Einstein condensate. When we remove atoms from the rotating condensate with a tightly focuse…
Observation and Analysis of Multiple Dark-Antidark Solitons in Two-Component Bose-Einstein Condensates
G. C. Katsimiga, S. I. Mistakidis, T. M. Bersano +6
We report on the static and dynamical properties of multiple dark-antidark solitons (DADs) in two-component, repulsively interacting Bose-Einstein condensates. Motivated by experim…
Observation of Faraday Waves in a Bose-Einstein Condensate
P. Engels, C. Atherton, M. A. Hoefer
Faraday waves in a cigar-shaped Bose-Einstein condensate are created. It is shown that periodically modulating the transverse confinement, and thus the nonlinear interactions in th…
Non-exponential tunneling due to mean-field induced swallowtails
Q. Guan, M. K. H. Ome, T. M. Bersano +3
Typically, energy levels change without bifurcating in response to a change of a control parameter. Bifurcations can lead to loops or swallowtails in the energy spectrum. The simpl…
Formation of Quantum Shock Waves by Merging and Splitting Bose-Einstein Condensates
J. J. Chang, P. Engels, M. A. Hoefer
The processes of merging and splitting dilute-gas Bose-Einstein condensates are studied in the nonadiabatic, high-density regime. Rich dynamics are found. Depending on the experime…
Spin-orbit coupled Bose-Einstein condensates in a one-dimensional optical lattice
C. Hamner, Yongping Zhang, M. A. Khamehchi +2
The realization of artificial gauge fields and spin-orbit coupling for ultra-cold quantum gases promises new insight into paradigm solid state systems. Here we experimentally probe…
Observations on Sound Propagation in Rapidly Rotating Bose-Einstein Condensates
T. P. Simula, P. Engels, I. Coddington +3
Repulsive laser potential pulses applied to vortex lattices of rapidly rotating Bose-Einstein condensates create propagating density waves which we have observed experimentally and…
Extreme (Rogue) Waves: From Theory to Experiments in Ultracold Gases and Beyond
A. Chabchoub, P. Engels, P. G. Kevrekidis +4
In this Chapter, we review key theoretical and experimental advances in the study of extreme nonlinear wave events, called rogue waves (RWs), in both single-component attractively…
Dynamics of Dark-Bright Solitons in Cigar-Shaped Bose-Einstein Condensates
S. Middelkamp, J. J. Chang, C. Hamner +6
We explore the stability and dynamics of dark-bright solitons in two-component elongated Bose-Einstein condensates by developing effective 1D vector equations as well as solving th…
Beating dark-dark solitons in Bose-Einstein condensates
D. Yan, J. J. Chang, C. Hamner +6
Motivated by recent experimental results, we study beating dark-dark solitons as a prototypical coherent structure that emerges in two-component Bose-Einstein condensates. We showc…
Experimental studies of equilibrium vortex properties in a Bose-condensed gas
I. Coddington, P. C. Haljan, P. Engels +3
We characterize several equilibrium vortex effects in a rotating Bose-Einstein condensate. Specifically we attempt precision measurements of vortex lattice spacing and the vortex c…
Vector Dark-Antidark Solitary Waves in Multi-Component Bose-Einstein condensates
I. Danaila, M. A. Khamehchi, V. Gokhroo +2
Multi-component Bose-Einstein condensates exhibit an intriguing variety of nonlinear structures. In recent theoretical work, the notion of magnetic solitons has been introduced. He…
Three-component soliton states in spinor Bose-Einstein condensates
T. M. Bersano, V. Gokhroo, M. A. Khamehchi +4
Dilute-gas Bose-Einstein condensates are an exceptionally versatile testbed for the investigation of novel solitonic structures. While matter-wave solitons in one- and two-componen…
Vortex Lattice Dynamics in Rotating Spinor Bose-Einstein Condensates
V. Schweikhard, I. Coddington, P. Engels +2
We observe interlaced square vortex lattices in rotating two-component dilute-gas Bose-Einstein condensates (BEC). After preparing a hexagonal vortex lattice in a single-component…
Observation of Tkachenko Oscillations in Rapidly Rotating Bose-Einstein Condensates
I. Coddington, P. Engels, V. Schweikhard +1
We directly image Tkachenko waves in a vortex lattice in a dilute-gas Bose-Einstein condensate. The low (sub-Hz) resonant frequencies are a consequence of the small but nonvanishin…
Nonequilibrium effects of anisotropic compression applied to vortex lattices in Bose-Einstein condensates
P. Engels, I. Coddington, P. C. Haljan +1
We have studied the dynamics of large vortex lattices in a dilute-gas Bose-Einstein condensate. While undisturbed lattices have a regular hexagonal structure, large-amplitude quadr…
Observation of dense collisional soliton complexes in a two-component Bose-Einstein condensate
S. Mossman, G. C. Katsimiga, S. I. Mistakidis +5
Solitons are nonlinear solitary waves which maintain their shape over time and through collisions, occurring in a variety of nonlinear media from plasmas to optics. We present an e…
Experimental realization of the Peregrine soliton in repulsive two-component Bose-Einstein condensates
A. Romero-Ros, G. C. Katsimiga, S. I. Mistakidis +5
We experimentally realize the Peregrine soliton in a highly particle-imbalanced two-component repulsive Bose-Einstein condensate in the immiscible regime. The effective focusing dy…
Breaking a superfluid harmonic dam: Observation and theory of Riemann invariants and accelerating sonic horizons
Shashwat Sharan, Judith Gonzalez Sorribes, Patrick Sprenger +4
An experimental and theoretical study of sonic horizons emerging from the dam-break problem in a Bose-Einstein condensate confined in an anisotropic harmonic trap is presented. Mea…
Nonlinear stage of modulational instability in repulsive two-component Bose-Einstein condensates
S. Mossman, S. I. Mistakidis, G. C. Katsimiga +5
Modulational instability (MI) is a fundamental phenomenon in the study of nonlinear dynamics, spanning diverse areas such as shallow water waves, optics, and ultracold atomic gases…
Spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins
M. A. Khamehchi, Chunlei Qu, M. E. Mossman +2
The quantum emulation of spin-momentum coupling (SMC), a crucial ingredient for the emergence of topological phases, is currently drawing considerable interest. In previous quantum…
Rabi oscillations and Ramsey-type pulses in ultracold bosons: Role of interactions
Q. Guan, T. M. Bersano, S. Mossman +2
Double-well systems loaded with one, two, or many quantum particles give rise to intriguing dynamics, ranging from Josephson oscillation to self-trapping. This work presents theore…
Wall effects on spatial correlations of non-affine strain in a 3D model glass
M. Hassani, P. Engels, F. Varnik
Effects of hard planar walls with a particle scale roughness on the spatial correlations of non-affine strain in amorphous solids are investigated via molecular dynamics simulation…
Driving Bose-Einstein condensate vorticity with a rotating normal cloud
P. C. Haljan, I. Coddington, P. Engels +1
We have developed an evaporative cooling technique that accelerates the circulation of an ultra-cold Rb gas, confined in a static harmonic potential. As a normal gas is evap…
Negative mass hydrodynamics in a Spin-Orbit--Coupled Bose-Einstein Condensate
M. A. Khamehchi, Khalid Hossain, M. E. Mossman +4
A negative effective mass can be realized in quantum systems by engineering the dispersion relation. A powerful method is provided by spin-orbit coupling, which is currently at the…
Generation of dark-bright soliton trains in superfluid-superfluid counterflow
C. Hamner, J. J. Chang, P. Engels +1
The dynamics of two penetrating superfluids exhibit an intriguing variety of nonlinear effects. Using two distinguishable components of a Bose-Einstein condensate, we investigate t…
Rapidly Rotating Bose-Einstein Condensates in and near the Lowest Landau Level
V. Schweikhard, I. Coddington, P. Engels +2
We create rapidly rotating Bose-Einstein condensates in the lowest Landau level, by spinning up the condensates to rotation rates of the centrifugal limit for a harmonical…