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Your search keyword '"Razvan, Chirla"' showing total 5 results
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5 results on '"Razvan, Chirla"'

1. Quantum criticality and formation of a singular Fermi liquid in the attractive SU(N > 2) Anderson model

Author

Moca, Cătălin Paşcu, Razvan, Chirla, Dóra, Balázs, and Zárand, Gergely

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

While much is known about repulsive quantum impurity models, significantly less attention has been devoted to their attractive counterparts. This motivated us to study the attractive SU(N) Anderson impurity model. While for the repulsive case, the phase diagram features mild N dependence and the ground state is always a Fermi liquid, in the attractive case a Kosterlitz-Thouless charge localization phase transition is revealed for N > 2. Beyond a critical value of attractive interaction an abrupt jump appears in the number of particles at the impurity site, and a singular Fermi liquid state emerges, where the scattering of quasiparticles is found to exhibit power law behavior with fractional power. The capacity diverges exponentially at the quantum critical point, signaling the Kosterlitz-Thouless transition., Comment: 5 pages, 4 figures, includes Supplemental Information

Published
2019
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2. Correlations between Endoscopic and Histopathological Assessment of Helicobacter pylori-Induced Gastric Pathology—A Cross-Sectional Retrospective Study

Author

Cătălina Dănilă, Ioana Alexandra Cardos, Andrea Pop-Crisan, Felicia Marc, Anica Hoza, Razvan Chirla, Andrei Pascalău, Calin Magheru, and Simona Cavalu

Subjects
H. pylori, atrophic gastritis, histopathology, intestinal metaplasia, RUT, Science
Abstract

Helicobacter pylori (H. pylori) infects about half of the world’s population and can lead to premalignant lesions and gastric cancer. Updated data about the correlation of histopathological diagnostics with endoscopic diagnostics are scarce. The objective of this study was to identify the concordance between endoscopic and histopathologic findings, with a focus on premalignant lesions. We performed a cross sectional, retrospective study over a 4-year period (2017–2021) on adult patients with dyspeptic symptoms and positive RUT (rapid urease test) in a single hospital centre, with a total of 133 patients infected with H. pylori being included in the study. Statistical associations between endoscopic appearance and histopathological results were found for atrophic antral gastritis (p = 0.001), intestinal metaplasia of the antrum (p = 0.018), gastric polyps (p < 0.001) and gastric corpus cancer (p = 0.012). Females were more likely to be diagnosed through endoscopy with gastric atrophy or intestinal metaplasia (p = 0.031), while chronic atrophic gastritis in corpus was more prevalent in patients older than 65 (p = 0.024). Overall, our study reveals only 21% concordance between Giemsa stain and RUT, highlighting the importance of combining rapid testing with endoscopic and histopathological diagnostic methods for a more accurate early diagnosis and prevention of gastric cancer.

Published
2022
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4. Quantum Criticality and Formation of a Singular Fermi Liquid in the Attractive SU(N2) Anderson Model

Author

Cătălin Paşcu, Moca, Razvan, Chirla, Balázs, Dóra, and Gergely, Zaránd

Abstract

While much is known about repulsive quantum impurity models, significantly less attention has been devoted to their attractive counterparts. This motivated us to study the attractive SU(N) Anderson impurity model. While for the repulsive case the phase diagram features mild N dependence and the ground state is always a Fermi liquid, in the attractive case a Kosterlitz-Thouless charge localization phase transition is revealed for N2. Beyond a critical value of attractive interaction, an abrupt jump appears in the number of particles at the impurity site, and a singular Fermi liquid state emerges, where the scattering of quasiparticles is found to exhibit power law behavior with fractional power. The capacity diverges exponentially at the quantum critical point, signaling the Kosterlitz-Thouless transition.

Published
2019

5. Strong field physics with long wavelength lasers

Author

J. Wheeler, K. D. Schultz, L. F. DiMauro, Anne Marie March, J. Tate, C. Roedig, Razvan Chirla, Emily Sistrunk, P. Colosimo, C. I. Blaga, Pierre Agostini, and James P. Cryan

Subjects
Physics, business.industry, Far-infrared laser, Strong field, Nonlinear optics, Parameter space, Laser, Atomic and Molecular Physics, and Optics, law.invention, Tunnel effect, Optics, X-ray photoelectron spectroscopy, law, Physics::Atomic Physics, business, Quantum tunnelling
Abstract

The generation of short, intense, mid-infrared laser pulses allows for the exploration of atom–laser interactions deep in the tunnelling regime as well as providing the ability to explore scaled interactions. In this paper we present recent experimental and theoretical results for this largely unexplored parameter space.

Published
2007
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