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We examine the intrinsic energy dissipation steps in electrically biased graphene channels. By combining in-situ measurements of the spontaneous optical emission with a Raman spectroscopy study of the graphene sample under conditions of…

Mesoscale and Nanoscale Physics · Physics 2015-03-13 Stéphane Berciaud , Melinda Y. Han , Louis E. Brus , Philip Kim , Tony F. Heinz

A fraction of the thermal protons in the outer envelope of an X-ray cluster have velocities that exceed the local escape speed from the cluster gravitational potential. The Coulomb mean-free-path of these protons is larger than the virial…

Astrophysics · Physics 2010-10-27 Abraham Loeb

Radiative cooling is an important ingredient in hydrodynamical models involving evolution of high temperature plasmas. Unfortunately, calculating an accurate cooling coefficient generally requires the solution of over a hundred differential…

Astrophysics · Physics 2009-11-06 Robert A. Benjamin , Bradford A. Benson , Donald P. Cox

Using the principle of detailed balance and the assumption on the absorption cross-section consistent with available astrophysical data, we obtain the energy distribution of atoms in the field of thermal blackbody radiation and show that…

Astrophysics · Physics 2007-05-23 F. V. Prigara

We apply near-threshold laser photodetachment to characterize the rotational quantum level distribution of OH$^-$ ions stored in the cryogenic ion-beam storage ring, DESIREE, at Stockholm University. We find that the stored ions relax to a…

Recently, a list of the top 50 most important electron capture (EC) and $\beta$-decay (BD) nuclei, averaged throughout the stellar trajectory for $0.500 > Y_e > 0.400$, was published. The current study presents the calculation of EC and BD…

Nuclear Theory · Physics 2025-03-19 Asim Ullah , Jameel-Un Nabi

Laser irradiation of materials is most commonly modeled with the two-temperature model (TTM), or its combination with molecular dynamics, TTM-MD. For such modeling, the electronic transport coefficients are required. Here, we calculate the…

Materials Science · Physics 2024-05-14 Nikita Medvedev , Fedor Akhmetov , Igor Milov

Electron and phonon transient temperatures are analyzed in the case of nondegenerate semiconductors. An analytical solution is obtained for rectangular laser pulse absorption. It is shown that thermal diffusion is the main energy relaxation…

At the ultra-thin limit below 20 nm, a film's electrical conductivity, thermal conductivity, or thermoelectricity depends heavily on its thickness. In most studies, each sample is fabricated one at a time, potentially leading to…

Mesoscale and Nanoscale Physics · Physics 2023-06-22 Kien Trung Nguyen , Giang Bui-Thanh , Hong Thi Pham , Thuat Nguyen-Tran , Chi Hieu Hoang , Hung Q. Nguyen

The cooling of hot electrons in graphene is the critical process underlying the operation of exciting new graphene-based optoelectronic and plasmonic devices, but the nature of this cooling is controversial. We extract the hot electron…

Mesoscale and Nanoscale Physics · Physics 2015-06-05 Matt W. Graham , Su-Fei Shi , Daniel C. Ralph , Jiwoong Park , Paul L. McEuen

We present two loop corrections to photon self energy at finite temperature in real time formalism. An expression for renormalized coupling constant has been derived in a form that is relevant for all temperature ranges of interest in QED,…

High Energy Physics - Theory · Physics 2013-10-15 Samina S. Masood , Mahnaz Q. Haseeb

We investigate the radiation from accelerating electrons with asymptotic constant velocity and their analog signatures as evaporating black holes with left-over remnants. We find high-speed electrons, while having a high temperature,…

General Relativity and Quantum Cosmology · Physics 2024-07-09 Kuan-Nan Lin , Evgenii Ievlev , Michael R. R. Good , Pisin Chen

The possibility of the precise measurement of the electron beam energy using absorption of radiation by electrons in a static and homogeneous magnetic field in a range up to a few hundred GeV energies, was considered in [1]. With the…

Accelerator Physics · Physics 2017-08-02 R. A. Melikian

The isotope $^{163}$Ho undergoes an electron capture process with a recommended value for the energy available to the decay, $Q_{\rm EC}$, of about 2.5 keV. According to the present knowledge, this is the lowest $Q_{\rm EC}$ value for…

Instrumentation and Detectors · Physics 2014-09-02 P. C. -O. Ranitzsch , C. Hassel , M. Wegner , S. Kempf , A. Fleischmann , C. Enss , L. Gastaldo , A. Herlert , K. Johnston

Photoionization from atom-C60 hybrid levels in halogen endufullerene molecules, Cl@C60, Br@C60 and I@C60, are calculated using a linear response density functional method. Both the ordinary electron-configuration where the open shell…

Atomic and Molecular Clusters · Physics 2021-06-08 Dakota Shields , Ruma De , Esam Ali , Mohamed E Madjet , Steven T Manson , Himadri S. Chakraborty

We present a measurement of the low-energy (0--60$\,$keV) $\gamma$ ray spectrum produced in the $\alpha$-decay of $^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy resolution of $\sim$$10\,$eV, together with…

The formalism of photon and dilepton productions in a thermal bath are discussed in the frame work of finite temperature field theory. The emission rate has been expressed in terms of the discontinuities or imaginary part of the photon self…

Nuclear Theory · Physics 2016-01-07 Jan-e Alam , Sourav Sarkar , Pradip Roy , Bikash Sinha

The six species heavy ion beam was accumulated with the help of electron cooling in the main ring of Cooler Storage Ring of Heavy Ion Research Facility in Lanzhou(HIRFL-CSR), the ion beam accumulation dependence on the parameters of cooler…

Accelerator Physics · Physics 2011-10-17 Yang Xiaodong

A model has been proposed for estimation of plasma parameters of explosive electron emission pulses in vacuum arc discharge. It based on transition through the critical state during the explosion and allow to predict the cathode spot plasma…

Plasma Physics · Physics 2020-10-26 M. M. Tsventoukh

We discuss the possibility that a significant contribution of the hard X-ray Background is the integrated emission from a population of galaxies undergoing advection-dominated accretion in their nuclei. Owing to poor coupling between ions…

Astrophysics · Physics 2015-06-24 T. Di Matteo , A. C. Fabian