S. Spielman

Thermalization within a Stark manifold through Rydberg atom interactions

S. Spielman, Sage M. Thomas, Maja Teofilovska, Annick C van Blerkom et autres

We use dynamical quantum typicality to predict the thermal equilibrium state of ultracold Rydberg atoms exchanging energy via long-range dipole-dipole interactions. We excite atoms to the center of a manifold of nearly-harmonically spaced clusters of Stark energy levels and then allow them …

Thermalization within a Stark manifold through Rydberg atom interactions

S. Spielman, Sage M. Thomas, Maja Teofilovska, Annick C van Blerkom et autres

We use dynamical quantum typicality to predict the thermal equilibrium state of ultracold Rydberg atoms exchanging energy via long-range dipole-dipole interactions. We excite atoms to the center of a manifold of nearly-harmonically spaced clusters of Stark energy levels and then allow them …

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Quantum many-body scars in few-body dipole-dipole interactions

S. Spielman, Alicia Handian, Nina P. Inman, Thomas J. Carroll et autres

We simulate the dynamics of Rydberg atoms resonantly exchanging energy via two-, three-, and four-body dipole-dipole interactions in a one-dimensional array. Using simplified models of a realistic experimental system, we study the initial-state survival probability, mean level spacing, spread of entanglement, and …

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Energy Transport Among Highly-Polarized Atoms

Catherine D. Opsahl, Samantha A. Grubb, Alan T. Okinaka, Nicolaus A. Chlanda et autres

We measure the transport of energy among the internal states of ultracold rubidium Rydberg atoms coupled by dipole-dipole exchange. In a magneto-optical trap, a static electric field of a few V/cm shifts the energy levels of the atoms. For a particular principal …

Lifetimes of excited states in Rh-

Julia Karls, Jon Grumer, Sacha Schiffmann, N. D. Gibson et autres

The radiative decay of excited states of the negative ion of rhodium, Rh$^-$, has been investigated experimentally and theoretically. The experiments were conducted at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stockholm University using selective photodetachment from a stored ion …

Using lock-in detection to build a barcode scanner

Riley E. Alexander, Maya M. DiFrischia, Margaret J. Doubman, Stefany Fabian Dubón et autres

Lock-in detection is a widely used experimental technique in which a weak signal is measured by modulating it at a particular frequency. Then, by detecting an experimental output at that frequency, the desired signal can be isolated from much larger-amplitude noise. Here, …

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Quantum Many-Body Scars in Few-Body Dipole-Dipole Interactions

S. Spielman, Alicia Handian, Nina P. Inman, Thomas J. Carroll et autres

We simulate the dynamics of Rydberg atoms resonantly exchanging energy via two-, three-, and four-body dipole-dipole interactions in a one-dimensional array. Using simplified models of a realistic experimental system, we study the initial state survival probability, mean level spacing, spread of entanglement, …

Observation of an Electric Quadrupole Transition in a Negative Ion: Experiment and Theory

C. W. Walter, S. Spielman, R. Ponce, N. D. Gibson et autres

The first direct experimental observation of an electric quadrupole (E2) absorption transition between bound states of an atomic negative ion has been made. The transition was observed in the negative ion of bismuth by resonant (1+1) photon detachment from Bi^{-} via ^{3}P_{2}→^{3}P_{0} …

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Predicting quasibound states of negative ions: La− as a test case

Marianna S. Safronova, Charles Cheung, M. G. Kozlov, S. Spielman et autres

We demonstrated the accurate prediction of a quasibound spectrum of a negative ion using a high-precision theoretical approach. We used ${\mathrm{La}}^{\ensuremath{-}}$ as a test case due to a recent experiment that measured energies of 11 resonances in its photodetachment spectrum attributed to …

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Electron affinity of thallium measured with threshold spectroscopy

C. W. Walter, N. D. Gibson, S. Spielman

The electron affinity of thallium has been precisely measured using laser photodetachment threshold spectroscopy. The relative photodetachment cross section from the negative ion $^{205}\mathrm{Tl}^{\ensuremath{-}}$ was measured using a tunable infrared laser over the photon energy range 300--900 meV (4130--1380 nm). A pair …

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Infrared laser spectroscopy measurement of the electron affinity of thallium

C. W. Walter, N. D. Gibson, K. R. Patel, S. Spielman

Synopsis The electron affinity of thallium, Tl, has been measured using tunable infrared laser photodetachment threshold spectroscopy. The relative cross section for neutral atom production following photodetachment from Tl− was measured with a crossed laser-ion beam apparatus over the photon energy range …

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Precise Measurement of the Electron Affinity of Thallium using Laser Photodetachment Threshold Spectroscopy

C. W. Walter, N. D. Gibson, S. Spielman