T. C. Killian
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Anomalies in the rotational spectra of $^{86}$Sr ULRRM dimers Open
Anomalies in the rotational structure of $^{86}$Sr $^3S_1$ dimer ultralong-range Rydberg molecules (ULRRMs) created in a cold strontium gas by two-photon excitation via the intermediate $5s5p~^3P_1$ state are reported. Measurements reveal …
Wave steepening and shock formation in ultracold neutral plasmas Open
We present observations of wave steepening and signatures of shock formation during expansion of ultracold neutral plasmas formed with an initial density distribution that is centrally peaked and decays exponentially with distance. The pla…
Wave Steepening and Shock Formation in Ultracold Neutral Plasmas Open
We present observations of wave steepening and signatures of shock formation during expansion of ultracold neutral plasmas formed with an initial density distribution that is centrally peaked and decays exponentially with distance. The pla…
Elucidating the roles of collision energy and photon momentum transfer in the formation of ultralong-range Rydberg molecules Open
Spectroscopic measurements of the rotational distribution of $^{84}$Sr and $^{86}$Sr 5sns $^1S_0$ ultralong-range Rydberg molecular dimers created via photoassociation in a cold gas are reported. The dimers are produced by two-photon excit…
Probing the topological phase transition in the Su-Schrieffer-Heeger model using Rydberg-atom synthetic dimensions Open
We simulate the the Su-Schrieffer-Heeger (SSH) model using Rydberg-atom synthetic dimensions constructed, in a single atom, from a ladder of six neighboring $n\:^3S_1$ Rydberg states in which adjacent states are coupled with two-photon tra…
Wave packet dynamics and long-range tunneling within the SSH model using Rydberg-atom synthetic dimensions Open
Rydberg-atom synthetic dimensions in the form of a lattice of n$^3S_1$ levels, $58\leq n \leq 63$, coupled through two-photon microwave excitation are used to examine dynamics within the single-particle Su-Schrieffer-Heeger (SSH) Hamiltoni…
Laser-induced-fluorescence imaging of a spin-polarized ultracold neutral plasma in a magnetic field Open
In this work, we report Doppler-sensitive laser-induced-fluorescence (LIF) imaging of an ultracold neutral plasma in a magnetic field. Local values of ion density, hydrodynamic fluid velocity, temperature, and spin polarization are obtaine…
Realizing topological edge states with Rydberg-atom synthetic dimensions: Datasets Open
This zip file contains the datasets presented in the paper titled "Realizing topological edge states with Rydberg-atom synthetic dimensions". Contains .csv files.
Realizing topological edge states with Rydberg-atom synthetic dimensions: Codes Open
Contains code used for Decoherence model in the paper titled "Realizing topological edge states with Rydberg-atom synthetic dimensions".
Magnetic Confinement of an Ultracold Neutral Plasma Open
We demonstrate magnetic confinement of an ultracold neutral plasma (UCNP) created at the null of a biconic cusp, or quadrupole magnetic field. Initially, the UCNP expands due to electron thermal pressure. As the plasma encounters stronger …
Expansion of ultracold neutral plasmas with exponentially decaying density distributions Open
We present a study of the expansion of an ultracold neutral plasma (UCNP) with an initial density distribution that decays exponentially in space, created by photoionizing atoms shortly after their release from a quadrupole (or biconic cus…
View article: Realizing Su-Schrieffer-Heeger topological edge states in Rydberg-atom synthetic dimensions
Realizing Su-Schrieffer-Heeger topological edge states in Rydberg-atom synthetic dimensions Open
We demonstrate a platform for synthetic dimensions based on coupled Rydberg levels in ultracold atoms, and we implement the single-particle Su-Schrieffer-Heeger (SSH) Hamiltonian. Rydberg levels are interpreted as synthetic lattice sites, …
Rydberg Atoms: Giants of the Atomic World Open
The creation of giant atoms whose size is comparable to that of a grain of sand might sound like the stuff of science fiction, but in fact such species exist in nature and can now be created in the laboratory using advanced laser systems. …
Heteronuclear Rydberg molecules Open
We report the creation of heteronuclear ultralong-range Rydberg-molecule\ndimers by excitation of minority $^{88}\\text{Sr}$ atoms to $5sns\\,^3S_1$\nRydberg states ($n=31-39$) in a dense background of $^{84}\\text{Sr}$. We\nobserve an iso…
Collective modes of ultracold fermionic alkaline-earth-metal gases with SU() symmetry Open
We calculate the collective modes of ultracold trapped alkaline-earth\nfermionic atoms, which possess an SU($N$) symmetry of the nuclear spin degree\nof freedom, and a controllable $N$, with $N$ as large as $10$. We calculate the\nbreathin…
Combined molecular-dynamics and quantum-trajectories simulation of laser-driven, collisional systems Open
We introduce a combined molecular-dynamics and quantum-trajectories code to simulate the effects of near-resonant optical fields on state-vector evolution and particle motion in a collisional system. In contrast to collisionless systems, i…
Measurements of spatial correlations in quantum gases using ultralong-range strontium Rydberg molecules Open
Synopsis The photoexcitation of ultralong-range Rydberg molecules is demonstrated as a probe of spatial cor-relations in a quantum gas on previously inaccessible length scales of 1400-3200 a 0 . Measurements using cold (∼1 μK) (fermionic) …
Excitation of vibrationally-excited ultralong-range strontium Rydberg molecules in quantum gases Open
Synopsis The photoexcitation rate for ultralong-range Rydberg molecules is sensitive to the initial spatial sepa-ration of the atoms from which they are formed. Here we explore the photoexcitation of different molecular vibrational states …
Exploring the crossover between high-energy-density plasma and ultracold neutral plasma physics Open
In this paper, we present ideas that were part of the miniconference on the crossover between High Energy Density Plasmas (HEDP) and Ultracold Neutral Plasmas (UNPs) at the 60th Annual Meeting of the American Physical Society Division of P…
View article: Probing nonlocal spatial correlations in quantum gases with ultra-long-range Rydberg molecules
Probing nonlocal spatial correlations in quantum gases with ultra-long-range Rydberg molecules Open
We present photo-excitation of ultra-long-range Rydberg molecules as a probe\nof spatial correlations in quantum gases. Rydberg molecules can be created with\nwell-defined internuclear spacing, set by the radius of the outer lobe of the\nR…
High-intensity two-frequency photoassociation spectroscopy of a weakly bound molecular state: Theory and experiment Open
We investigate two-frequency photoassociation of a weakly bound molecular\nstate, focusing on a regime where the ac Stark shift is comparable to the\nhalo-state energy. In this "high-intensity" regime, we observe features absent\nin low-in…
Laser cooling of ions in a neutral plasma Open
Making a strongly coupled plasma Plasmas—gases of ionized atoms and electrons—are naturally formed at high temperatures, such as those reached in the interiors of stars. Describing plasmas theoretically is tricky when they are in the stron…
The use of a microelectroporator to study poration of Jurkat cells Open
A microelectroporation system was built to provide a well-controlled and defined environment for quantitative studies of electroporation, a method to permeabilize cell membranes for delivery of normally impermeable biomolecules, of an immo…
Replication Data for: Laser Cooling of Ions in a Neutral Plasma Open
This dataset contains all data presented in "Laser Cooling of Ions in a Neutral Plasma"
Theory of excitation of Rydberg polarons in an atomic quantum gas Open
We present a quantum many-body description of the excitation spectrum of\nRydberg polarons in a Bose gas. The many-body Hamiltonian is solved with\nfunctional determinant theory, and we extend this technique to describe Rydberg\npolarons o…
Creation of Rydberg Polarons in a Bose Gas Open
We report spectroscopic observation of Rydberg polarons in an atomic Bose gas. Polarons are created by excitation of Rydberg atoms as impurities in a strontium Bose-Einstein condensate. They are distinguished from previously studied polaro…
spectrumExampleFigS1B.dat Open
Example spectrum data shown in Fig. S1B: Column 1: Detuning (MHz). Column 2: "signal" (normalized such that maximum signal is set to unity).
5usTempDataFig2A.dat Open
Contains T vs x data shown in Fig. 2A. File structure is as follows: Column 1 is x (in mm), columns 2-4 display, in order: No 408 Temperature (yellow dots), Minus 20 MHz Temperature (red dots), Plus 20 MHz Temperature (blue dots) (all temp…
tempVsDetFig4AData.dat Open
Temperature vs detuning data shown in Fig 4A: Column 1: Detuning (in MHz). Column 2: Temperature (in K). Column 3: Errorbar (in K).