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Your search keyword '"Hazlett, E. A."' showing total 123 results
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123 results on '"Hazlett, E. A."'

1. 3D Printing an External Cavity Diode Laser Housing

Author

Brekke, E., Bennett, T., Rook, H., and Hazlett, E. L.

Subjects
Physics - Physics Education, Physics - Atomic Physics
Abstract

The ability to control the frequency of an external-cavity diode laser (ECDL) is an essential component for undergraduate laboratories and atomic physics research. Typically the housing for the ECDL's diffraction grating and piezoelectric transducer is either purchased commercially or machined from metal. Here, we present an alternative to these commonly used options that utilizes 3D printing, a tool available in many physics departments. We characterize the performance of our ECDL system using atomic spectroscopy and self-heterodyne interferometry and show that it is sufficient for use in undergraduate spectroscopy experiments and a number of research applications where extremely narrow laser linewidths are not necessary. The performance and affordability of 3D-printed designs make them an appealing option for future use.

Published
2020
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2. Realization of a Resonant Fermi Gas with a Large Effective Range

Author

Hazlett, E. L., Zhang, Y., Stites, R. W., and O'Hara, K. M.

Subjects
Condensed Matter - Quantum Gases
Abstract

We have measured the interaction energy and three-body recombination rate for a two-component Fermi gas near a narrow Feshbach resonance and found both to be strongly energy dependent. Even for deBroglie wavelengths greatly exceeding the van der Waals length scale, the behavior of the interaction energy as a function of temperature cannot be described by atoms interacting via a contact potential. Rather, energy-dependent corrections beyond the scattering length approximation are required, indicating a resonance with an anomalously large effective range. For fields where the molecular state is above threshold, the rate of three-body recombination is enhanced by a sharp, two-body resonance arising from the closed-channel molecular state which can be magnetically tuned through the continuum. This narrow resonance can be used to study strongly correlated Fermi gases that simultaneously have a sizeable effective range and a large scattering length., Comment: to appear in Phys. Rev. Lett

Published
2011
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3. Evidence for Ground- and Excited-State Efimov Trimers in a Three-State Fermi Gas

Author

Williams, J. R., Hazlett, E. L., Huckans, J. H., Stites, R. W., Zhang, Y., and O'Hara, K. M.

Subjects
Quantum Physics
Abstract

We observe enhanced three-body recombination in an ultracold three-component $^6$Li Fermi gas with large but unequal scattering lengths attributable to an excited Efimov trimer state near the three-atom scattering threshold. We find excellent agreement between the measured three-body recombination rate and the recombination rate calculated in the zero-range approximation where the only free parameters are the Efimov parameters $\kappa_*$ and $\eta_*$. The value of $\kappa_*$ determined by the location of the Efimov resonance we observe at 895 G also predicts the locations of loss features previously observed near 130 and 500 G \cite{Jochim08,OHara09} suggesting that all three features are associated with universal Efimov trimer states. We also report on the first realization of a quantum degenerate three-state Fermi gas with approximate SU(3) symmetry., Comment: 4 pages, 2 figures

Published
2009
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4. Three-body recombination in a three-state Fermi gas with widely tunable interactions

Author

Huckans, J. H., Williams, J. R., Hazlett, E. L., Stites, R. W., and O'Hara, K. M.

Subjects
Physics - Atomic Physics
Abstract

We investigate the stability of a three spin state mixture of ultracold fermionic $^6$Li atoms over a range of magnetic fields encompassing three Feshbach resonances. For most field values, we attribute decay of the atomic population to three-body processes involving one atom from each spin state and find that the three-body loss coefficient varies by over four orders of magnitude. We observe high stability when at least two of the three scattering lengths are small, rapid loss near the Feshbach resonances, and two unexpected resonant loss features. At our highest fields, where all pairwise scattering lengths are approaching $a_t = -2140 a_0$, we measure a three-body loss coefficient $L_3 \simeq 5\times 10^{-22} \mathrm{cm}^6/\mathrm{s}$ and a trend toward lower decay rates for higher fields indicating that future studies of color superfluidity and trion formation in a SU(3) symmetric Fermi gas may be feasible.

Published
2008
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5. Preparing a highly degenerate Fermi gas in an optical lattice

Author

Williams, J. R., Huckans, J. H., Stites, R. W., Hazlett, E. L., and O'Hara, K. M.

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Other Condensed Matter
Abstract

We propose a method to prepare a sample of fermionic atoms in a three-dimensional (3D) optical lattice at unprecedentedly low temperatures and uniform filling factors. The process involves adiabatic loading of atoms into multiple energy bands of an optical lattice followed by a filtering stage whereby atoms from all but the ground band are removed. Of critical importance is the use of a non-harmonic trapping potential, taken here to be the radial profile of a high-order Laguerre-Gaussian laser beam, to provide external confinement for the atoms. For realistic experimental parameters, this procedure should produce samples with temperatures $\sim10^{-3}$ of the Fermi temperature. This would allow the investigation of the low-temperature phase diagram of the Fermi-Hubbard model as well as the initialization of a high-fidelity quantum register., Comment: 5 pages, 4 figures

Published
2008

12. Gender differences and similarities in aggression, suicidal behaviour, and psychiatric comorbidity in borderline personality disorder.

Author

Sher, L., Rutter, S. B., New, A. S., Siever, L. J., and Hazlett, E. A.

Subjects
GENDER differences (Psychology), AGGRESSION (Psychology), SUICIDAL behavior, BORDERLINE personality disorder, INTERVIEWING
Abstract

Objective: We examined gender differences and similarities in aggression, impulsivity, suicidal behaviour, and psychiatric comorbidity in men and women with borderline personality disorder (BPD) compared with healthy controls. Method: A community sample of 511 participants (healthy controls: 81 men and 82 women; BPD patients: 145 men and 203 women) were rigorously characterized using structured diagnostic interviews and symptom severity assessments. Results: In comparison with women with BPD, men were less educated, had higher total Barratt Impulsivity Scale (BIS), BIS—motoric impulsiveness and BIS—non‐planning impulsiveness subscale, total Buss–Perry Aggression Questionnaire (BPAQ), and BPAQ—physical aggression subscale scores. Men with BPD were more likely to have comorbid narcissistic, antisocial, paranoid, and schizotypal personality disorders, alcohol and substance use disorders but less likely to have dependent and obsessive–compulsive personality disorders compared to women with BPD. There was a trend toward higher maximum lethality of suicide attempts in men suicide attempters compared with women suicide attempters but no difference between men and women with regard to the proportion of suicide attempters or the number of suicide attempts. Conclusion: Men with BPD are more impaired and may be at higher risk of dying by suicide compared to women with BPD. [ABSTRACT FROM AUTHOR]

Published
2019
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13. White Matter Abnormalities in Schizophrenia and Schizotypal Personality Disorder

Author

Lener, M. S., primary, Wong, E., additional, Tang, C. Y., additional, Byne, W., additional, Goldstein, K. E., additional, Blair, N. J., additional, Haznedar, M. M., additional, New, A. S., additional, Chemerinski, E., additional, Chu, K.-W., additional, Rimsky, L. S., additional, Siever, L. J., additional, Koenigsberg, H. W., additional, and Hazlett, E. A., additional

Published
2014
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26. Metabolic changes with age in schizophrenia

Author

Buchsbaum, M.S., primary, Hazlett, E., additional, Shihabuddin, L., additional, Wei, T., additional, Haznedar, M., additional, Schnur, D., additional, Machac, J., additional, Vallabhajosula, S., additional, Knesaurek, K., additional, Mohs, R.C., additional, and Davis, K., additional

Published
1997
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29. Neurobiologyy of the schizophrenia spectrum

Author

Siever, L.J., primary, Buchsbaum, M., additional, Cornblatt, B., additional, Harvey, P., additional, Bergman, A., additional, Siegel, B., additional, Hazlett, E., additional, Callahan, A., additional, New, A.S., additional, and Downhill, J., additional

Published
1996
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30. Lateral and medial temporal Lobe metabolic rate in Alzheimer's disease

Author

Shihabuddin, L., primary, Buchsbaum, M.S., additional, Harvey, P., additional, Hazlett, E., additional, Haznedar, M., additional, Marin, D., additional, Pandit, N., additional, Spiegel-Cohen, J., additional, Wei, C.T., additional, Abel, L., additional, Ciaravolo, T., additional, Machac, J., additional, Knesaurek, K., additional, Vallabhajosula, S., additional, Fine, E., additional, Mohs, R.C., additional, and Davis, K.L., additional

Published
1996
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35. Glucose metabolic rate in normals and schizophrenics during the Continuous Performance Test assessed by positron emission tomography.

Author

Buchsbaum, Monte S., Nuechterlein, Keith H., Haier, Richard J., Wu, Joseph, Sicotte, Nancy, Hazlett, Erin, Asarnow, Robert, Potkin, Stephen, Guich, Steven, Buchsbaum, M S, Nuechterlein, K H, Haier, R J, Wu, J, Sicotte, N, Hazlett, E, Asarnow, R, Potkin, S, and Guich, S

Subjects
PEOPLE with schizophrenia, GLUCOSE, METABOLISM, SCHIZOPHRENIA, POSITRON emission tomography, CONTINUOUS performance test, GLUCOSE metabolism, CEREBRAL cortex, COMPARATIVE studies, DEOXY sugars, FRONTAL lobe, RESEARCH methodology, MEDICAL cooperation, PSYCHOLOGICAL tests, RADIOPHARMACEUTICALS, RESEARCH, RESEARCH funding, VISUAL perception, EVALUATION research
Abstract

Local cerebral uptake of glucose labelled with fluorine-18 was measured by positron emission tomography in 13 patients with schizophrenia and 37 right-handed volunteers. Patients received no medication for a minimum of 31 days and a mean of 30 weeks. The subjects were administered the labelled deoxyglucose just after the beginning of a 32-minute sequence of blurred numbers as visual stimuli for the Continuous Performance Test. In normal controls, task performance was associated with increases in glucose metabolic rate in the right frontal and right temporoparietal regions; occipital rates were unchanged. Patients with schizophrenia showed both absolutely and relatively reduced metabolic rates in the frontal cortex and in the temporoparietal regions compared with normal controls. [ABSTRACT FROM AUTHOR]

Published
1990
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