WorldCat Identities

Cornell, Eric A.

Works: 33 works in 35 publications in 3 languages and 59 library holdings
Genres: Conference papers and proceedings 
Roles: Author, Production personnel
Publication Timeline
Most widely held works by Eric A Cornell
Stone cold science : Bose-Einstein condensation and the weird world of physics a billionth of a degree from absolute zero by Eric Allin Cornell( Visual )

2 editions published in 2002 in English and held by 4 WorldCat member libraries worldwide

Dr. Cornell, one of the youngest scientists to receive a Nobel prize in physics, discusses one of the newest and most rapidly advancing fields of quantum physics, something that has let scientists into a new world of atom optics, atom lasers, quantum whirlpools and quantum computers
Towards Measuring the Electron Electric Dipole Moment Using Trapped Molecular Ions by R. P Stutz( )

1 edition published in 2010 in English and held by 3 WorldCat member libraries worldwide

I will discuss the criteria for molecular ions in our experiment and our current candidates. A laser-ablation supersonic-expansion beam source has been developed to create and cool molecular ions. These ions have been loaded into a linear rf Paul trap and alternative photoionization methods for state-selective ion creation have been tested. Various experimental methods for performing the necessary spin resonance measurement are discussed. Sources of both decoherence and systematic errors have been identified and estimated. The experiment described in this thesis should be capable of a factor of 30 improvement on the current limit of the eEDM
Strongly interacting Bose-Einstein condensates: Probes and techniques by Juan Manuel Ii Pino( )

1 edition published in 2010 in English and held by 3 WorldCat member libraries worldwide

A dilute gas Bose-Einstein condensate (BEC) near a Feshbach resonance offers a system that can be tuned from the well-understood regime of weak interactions to the complex regime of strong interactions. Strong interactions play a central role in the phenomena of superfluidity in liquid He, and theoretical treatments for this regime have existed since the 1950's. However, these theories have not been experimentally tested as superfluid He offers no similar mechanism with which to tune the interactions. In dilute gas condensates near a Feshbach resonance, where interactions can be tuned, strong interactions have proven difficult to study due to the condensate's metastable nature with respect to the formation of weakly bound molecules. In this thesis, I introduce an experimental system and novel probes of the gas that have been specifically designed to study strongly interacting BECs. I present Bragg spectroscopy measurements that have accessed this regime, as well as proof-of-principle experiments using photon-counting for Bragg spectroscopy at low-momentum. Finally, I show preliminary data using contact spectroscopy, which is a method that could lead to the first measurements of the predicted interaction energies for a dilute Bose gas of atoms in the strongly interacting regime
Probing an interacting Bose gas in a quasi-two-dimensional trap by Shih-Kuang Tung( )

1 edition published in 2010 in English and held by 3 WorldCat member libraries worldwide

A fluctuating regime associated with the Berenzinskii-Kosterlitz-Thouless (BKT) transition is studied in a two-dimensional system of near-degenerate bosons (87Rb atoms). Two imaging procedures, the in-situ imaging method and the focusing-imaging method, are implemented to image the coordinate-space and momentum-space density distributions. The scaled compressibility is extracted from the coordinate-space density distributions obtained from in-situ images. Comparing the measured compressibility to the prediction from our semiclassical mean-field model, an onset of a regime which is beyond the mean-field prediction is identified and first resolved at phase-space density nlambda2 & gsim; 3. Information about the coherence of the system is extracted from the momentum-space distributions obtained from the focusing images. The spatial extent of the coherence at a size of the high density region in the system only appears at a distinguishably higher phase-space density of nlambda 2 & ap; 8. Therefore, a very interesting regime that is beyond mean-field prediction, but not yet a quasicondensate, is identified. This regime, which does not exist in three dimensions, is a product of the enhanced interactions associated with reduced dimensionality
Techniques in molecular spectroscopy: from broad bandwidth to high resolution by Kevin C Cossel( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

This thesis presents a range of different experiments all seeking to extended the capabilities of molecular spectroscopy and enable new applications. The new technique of cavity-enhanced direct frequency comb spectroscopy (CE-DFCS) provides a unique combination of broad bandwidth, high resolution, and high sensitivity that can be useful for a wide range of applications. Previous demonstrations of CE-DFCS were confined to the visible or near-infrared and operated over a limited bandwidth: for many applications it is desirable to increase the spectral coverage and to extend to the mid-infrared where strong, fundamental vibrational modes of molecules occur. There are several key requirements for CE-DFCS: a frequency comb source that provides broad bandwidth and high resolution, an optical cavity for high sensitivity, and a detection system capable of multiplex detection of the comb spectrum transmitted through the cavity. We first discuss comb sources with emphasis on the coherence properties of spectral broadening in nonlinear fiber and the development of a high-power frequency comb source in the mid-infrared based on an optical-parametric oscillator (OPO). To take advantage of this new mid-infrared comb source for spectroscopy, we also discuss the development of a rapid-scan Fourier-transform spectrometer (FTS). We then discuss the first demonstration of CE-DFCS with spectrally broadened light from a highly nonlinear fiber with the application to measurements of impurities in semiconductor manufacturing gases. We also cover our efforts towards extending CE-DFCS to the mid-infrared using the mid-infrared OPO and FTS to measure ppb levels of various gases important for breath analysis and atmospheric chemistry and highlight some future applications of this system
Development of Frequency Comb Velocity-Modulation Spectroscopy, Spectroscopy of Hafnium Fluoride Ion (+) and the JILA eEDM Experiment by Laura C Sinclair( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

Broad bandwidth, precision spectroscopy of the molecular ions of interest to the JILA electron electric dipole moment experiment, HfF+ and ThF+, is necessary due to the limited amount of spectroscopic information available and the large theoretical uncertainties in the energy level structure (thousands of wavenumbers). This thesis covers the development of a novel spectroscopic technique, frequency comb velocity-modulation spectroscopy, that provides high resolution, broad spectral bandwidth, ion discrimination and high sensitivity simultaneously. Frequency comb velocity-modulation spectroscopy as well as single-frequency velocity-modulation spectroscopy have been used to identify five rotational bands of HfF+. This work discusses the first spectroscopic information for HfF+ which came from our measurement of the 1pi1 -- 1Sigma+ (0,0) band recorded with single-frequency velocitymodulation spectroscopy with a sensitivity of 3x10-7 Hz-1/2. The development of frequency comb velocity-modulation spectroscopy allowed us to cover a thousand wavenumbers of spectral bandwidth and to identify an additional four HfF + bands. The achieved sensitivity for frequency-comb velocity-modulation spectroscopy was 4x10-8 Hz-1/2 (spectral element) -1/2 with 1500 simultaneous detection channels spanning 150 cm -1 of bandwidth. For a 30 minute acquisition time using 30 interleaved images to densely sample the whole spectrum, this corresponded to a 3x10 -7 single-pass fractional absorption sensitivity for each of the 45,000 measurement channels. The spectroscopic information from all five HfF + rotational bands is presented and molecular constants for the 1Sigma+, 3pi1, and 1pi1 states were extracted
Production, Deceleration, and Detection of OH Radicals by Travis C Briles( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Samples of cold and ultracold polar molecules have the potential to revolutionize physical chemistry, precision measurement, and few-body quantum physics. This thesis describes experimental results for the production of cold samples of OH radicals by Stark deceleration of a supersonic beam. Since Stark decelera- tion cannot increase the phase space density of the sample, the initial production stage of the OH molecule is critical. The first set of experiments describes a general methodology for the production of OH beams with maximal phase space density, as well as the subsequent coupling to a Stark decelerator. Additionally, we describe the redesign of our electrostatic trap, optimized for future collision experiments of OH with co-trapped ultracold Rb atoms. The new design resulted in a 15-fold increase in total number of trapped molecules over the previous design when tested with ND3 molecules. The second set of experiments focuses on laser-based detection of OH molecules at the exit of the decelerator based on laser induced fluorescence (LIF) and resonance enhanced multiphoton ionizaton (REMPI). The latter method uses vacuum-ultraviolet light at 118nm produced by third-harmonic generation in Xe/Ar gas mixtures as the ionizing step. The sensitivity of this latter technique is limited by the attainable photon flux of the ionizing radiation at 118nm. We present detailed measurements of the conversion efficiencies as well as absolute photon fluxes. Strategies to overcome these limitations as well as prospects for detection of OH molecules in a trap are discussed
Bose-Einstein condensation in a dilute atomic gas by Eric Cornell( Visual )

1 edition published in 1995 in English and held by 2 WorldCat member libraries worldwide

Eric Cornell, of the University of Colorado's Joint Institute for Laboratory Astrophysics, talks about cooling a gas of Rubidium-87 atoms through the B.E.C. phase transition at 100 nanokelvin, and observing the sudden accumulation of atoms in the lowest state of the confining potential. With the mean inter-atomic spacing much greater than the two-body scattering length, the system proves to be an ideal workshop for exploring quantum degeneracy
El condensado de Bose-Einstein by Eric A Cornell( )

2 editions published in 1998 in Spanish and held by 2 WorldCat member libraries worldwide

Measuring the Electron Electric Dipole Moment with Trapped Molecular Ions by Matt Grau( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

An electron electric dipole moment (eEDM) directly violates time-reversal symmetry, a fact which has far reaching implications for physics beyond the Standard Model. An experiment using trapped molecular ions offers high sensitivity because of the large effective electric fields and long coherence times that are possible. We demonstrate precision spectroscopy on many trapped HfF+ ions in a radiofrequency quadrupole trap with rotating electric and magnetic fields. The spectroscopy performed is a Ramsey type experiment between spin states of the metastable 3Delta 1 electronic state and has a coherence time exceeding 1 second. We have collected and analyzed over 200 hours of Ramsey spectroscopy data taken under a variety of experimental conditions. We identify several systematic errors that could potentially affect an eEDM measurement and estimate the size of these interloping effects. By collecting data under pairs of conditions where the eEDM has opposing signs (e.g. performing Ramsey spectroscopy on the two Lambda-doublets) we are able to take frequency differences that can suppress some of these systematic effects. Although our data set includes runs where we have intentionally varied experimental parameters to study systematic effects, we achieve a 1sigma statistical sensitivity of 2.76 x 10-28 e˙cm and place a 1sigma upper bound on the size of systematic effects of 2.82 x 10-28 e˙cm. Finally we present a preliminary upper bound on the eEDM of
Contact Measurements on a Strongly Interacting Bose Gas by Robert Johannes Wild( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

A powerful set of universal relations, centered on a quantity called the contact, connects the strength of short-range two-body correlations to the thermodynamics of a many-body system with delta-function interactions. For bosons, the fact that contact spectroscopy can be used to probe the gas on short timescales is potentially useful given the decreasing stability of BECs with increasing interactions. Successfully measuring the contact requires careful control of experimental parameters such as the magnetic field and the RF probe pulse. In this thesis I report on measurements of the contact, using RF spectroscopy, for an 85Rb atomic Bose-Einstein condensate (BEC). The measured contact exhibits beyond-mean-field behavior, the degree of which is dependent on the rates of change of the scattering length. A potential complication is the added possibility, for bosons, of three-body interactions. In investigating this issue, we have located an Efimov resonance for 85Rb atoms with loss measurements and thus determined the three-body interaction parameter
Observation of a Persistent Non-Equilibrium State in an Extremely Isotropic Harmonic Potential by D. S Lobser( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Such improbable systems of atoms have only very recently been realized experimentally. Kinoshita et al. [36] experimentally confirmed that atoms constrained to move in a quasi one-dimensional potential, an atomistic Newtons cradle, exhibit vastly suppressed relaxation. Chevy et al. [15] observed long-lived breathe-mode oscillations in highly elongated but still 3D geometries. Perhaps one of the more interesting cases is the vanishing damping of the monopole breathe-mode oscillation in a spherically symmetric harmonic oscillator [29], where a cloud of atoms experiences undamped temperature oscillations, causing the cloud to expand and contract as if it were breathing. Until now, this phenomenon has been experimentally inaccessible due to the difficulty in generating isotropic harmonic confinement. This thesis discusses a new magnetic trap capable of producing spherical confinement and presents the first experimental realization of this historically significant oddity using a magnetically trapped gas of 87Rb atoms
Bose polarons and rotating gases in an ultracold Bose-Fermi gas mixture of 40K and 87Rb atoms by Ming-Guang Hu( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

An ultracold Bose-Fermi gas mixture of 40K and 87Rb atoms has tunable interspecies interactions and therefore provides a fantastic platform for exploring not only few-body physics such as Feshbach molecule formation and Efimov trimers, but also many-body physics including Bose polarons, quantum Hall physics and so on. In this thesis, I present experimental evidence of Bose polarons in cold atoms obtained using radio-frequency spectroscopy to measure the excitation spectrum of fermionic 40K impurities resonantly interacting with a BEC of 87Rb atoms. These Bose polarons originate from the dressing of an impurity coupled to its environment, which is an important paradigm in quantum many-body physics. I also present initial work that launches an exciting new direction for our experiment, which is exploring rotating quantum gases. Goals for this work include studying both rotating Bose and Fermi superfluids with tunable interactions as well as working toward rapidly rotating quantum gases in the quantum Hall regime. For these goals, a new all-optical trap for rotating gases was designed, implemented, and tested using a 87Rb Bose-Einstein condensate
Search for an electron electric dipole moment with trapped molecular ions by Huanqian Loh( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

The search for a permanent electron electric dipole moment (eEDM) serves as a test of fundamental symmetry violations and of physics beyond the Standard Model. Trapped molecular ions in the 3Delta 1 metastable electronic state are suitable candidates for an eEDM search due to their large effective electric fields and long electron spin coherence times. This thesis presents the quantum state manipulation and coherent spectroscopy of trapped HfF+ molecular ions in rotating bias fields for an eEDM search. The quantum state manipulation, which involves preparation of a large fraction of molecular ions in a single desired quantum state as well as rotational-state-resolved detection, is complicated by the lack of HfF+ spectroscopic information prior to the start of this thesis. We performed state preparation by first state-selectively autoionizing neutral HfF such that 35% of the HfF+ are formed in a single rovibrational level of the electronic ground state 1Sigma+, and then transferring those ions into the desired Stark levels of a single hyperfine-rovibrational manifold of the 3Delta1 state. Rotational-state-resolved detection is accomplished by both laser-induced fluorescence and resonance-enhanced multi-photon photodissociation, where the latter is preferred as the state detection method of choice because its efficiency is two orders of magnitude higher compared to LIF. With the quantum state manipulation techniques developed, we performed Ramsey spectroscopy of the trapped HfF+ ions in the presence of rotating bias electric and magnetic fields, demonstrating electron spin coherence times as long as 150 ms. Finally, we present a preliminary measurement of the eEDM at the
Experimental studies of a degenerate unitary Bose gas by Philip Makotyn( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

I introduce our experimental system and the techniques we used to probe the BEC. I first report on probes of a BEC in the weakly interacting regime. To probe a spherical 85Rb BEC with strong interactions we implemented a novel experimental technique that allowed us to quickly change the interactions, bypassing inelastic losses. We projected the BEC onto unitarity, where the scattering length diverges and the interactions are infinite, in order to observe dynamics and the unexpectedly long lifetime of the gas. Additionally, we observe a universality of the gas with respect to the length scale set by the interparticle spacing
Vortices in a highly rotating Bose condensed gas by I. R Coddington( )

1 edition published in 2004 in English and held by 2 WorldCat member libraries worldwide

This thesis explores the physics of vortices and vortex lattices in the dilute gas Bose-Einstein condensate while drawing connections to other superfluid systems. In addition to characterizing several equilibrium vortex effects, this work also studies several excitations. By removing atoms from the rotating condensate with a tightly focused, resonant laser, the density can be locally suppressed, creating aggregate vortices containing many units of circulation. These so called "giant vortices" offer insight into the dynamical stability of density defects in this system. Using similar techniques we can excite and directly image Tkachenko waves in the vortex. These low frequency modes are a consequence of the small but nonvanishing elastic shear modulus of the vortex-filled superfluid
Very cold indeed : the Nanokelvin physics of Bose Einstein condensation by Eric Cornell( Visual )

1 edition published in 1996 in English and held by 2 WorldCat member libraries worldwide

At a NIST colloquium held February 23, 1996 at the National Institute of Standards and Technology, Eric Cornell discusses Bose Einstein condensation and asks the questions - How do we get something that cold and what is the nature of the strange goop that results?
Mass spectroscopy using single ion cyclotron resonance by Eric Allin Cornell( )

1 edition published in 1990 in English and held by 2 WorldCat member libraries worldwide

Probing Local Quantities in a Strongly Interacting Fermi Gas and the Construction of an Ultracold Fermi Gas Apparatus by Rabin Paudel( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

The nature of the normal phase of an ultracold Fermi gas in the BCS-BEC crossover regime is an interesting and unresolved question. As interactions increase, while the many-body ground state remains a condensate of paired fermions, the normal state must evolve from a Fermi liquid to a Bose gas of molecules. In this thesis, I present a technique to spatially select a homogeneous sample from the center of a trapped gas to explore this crossover. Combining this technique with RF spectroscopy, we locally measure Tan's contact as a function of temperature and compare to various many-body theories. In another experiment, we measure the distribution of single-particle energies and momenta for a normal gas across the BCS-BEC crossover. We find that the data fit well to a two-part function that includes a peak corresponding to fermionic quasiparticles and an "incoherent background" that is modeled using the dispersion of thermal molecules. I also describe the construction of a new-generation Fermi gas apparatus
Getting to Bose condensation in an atom trap by Eric Cornell( Visual )

1 edition published in 1991 in English and held by 2 WorldCat member libraries worldwide

Eric Cornell, of the University of Colorado's Joint Institute for Laboratory Astrophysics, talks about techniques in optical and magnetic cooling and trapping of neutral atoms which promise to obtain Bose-Einstein condensation (BEC) in an ideal-gas vapor of weakly interacting atoms. Various difficulties have thus far limited densities to some orders of magnitude shy of the BEC transition. New atom-trapping tricks which skirt the density limits are discussed, as well as BEC itself and related experiments in degenerate quantum vapors that now seem practicable
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Alternative Names
Cornell, Eric A.

Cornell, Eric Allin

Eric A. Cornell

Eric A. Cornell físico estadounidense

Eric Allin Cornell americký fyzik

Eric Allin Cornell amerikansk fysikar

Eric Allin Cornell amerikansk fysiker

Eric Allin Cornell físic estatunidenc

Eric Allin Cornell físico estadounidense

Eric Allin Cornell fisico statunitense

Eric Allin Cornell fizician american

Eric Allin Cornell US-amerikanischer Physiker

Eric Cornell

Eric Cornell Amerikaans natuurkundige

Eric Cornell amerikansk fysiker

Eric Cornell physicien américain

Eric Cornell yhdysvaltalainen fyysikko

Ericus Allin Cornell

Erik Kornell

Ерик Корнел

Ерік Корнелл

Эрик Аллин Корнелл американский физик, лауреат Нобелевской премии по физике

Эрык Алін Корнел

אריק קורנל

אריק קורנל פיזיקאי אמריקאי

اریک آلن کرنل فیزیک‌دان آمریکایی

إيريك ألين كورنيل

إيريك ألين كورنيل فيزيائي أمريكي

ایرک ایلن کارنل

ایرک ایلن کورنیل

ئەرجئا للن جۆرنەلل

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