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Phonon transport of recently-fabricated $\mathrm{Na_2He}$ at high pressure is investigated from a combination of first-principles calculations and the linearized phonon Boltzmann equation within the single-mode relaxation time approximation…

Materials Science · Physics 2017-05-24 San-Dong Guo , Ai-Xia Zhang

We investigate the influence of charged kaon condensation in hadronic sector on the formation of the electron-free charge neutral quark matter of equipartition of three light flavors, i.e., a phenomenon called ``enforced electrical…

High Energy Physics - Phenomenology · Physics 2007-05-23 Youngman Kim , Dong-Pil Min , Mannque Rho

Two-dimensional transition metal dichalcogenides (TMDCs) are finding promising electronic and optical applications due to their unique properties. In this letter, we systematically study the phonon transport and thermal conductivity of…

Materials Science · Physics 2014-09-30 Xiaokun Gu , Ronggui Yang

Background: The two-flavor color superconducting (2SC) phase of quark matter is a possible constituent of the core of neutron stars. To assess its impact on the observable behavior of the star one must analyze transport properties, which in…

High Energy Physics - Phenomenology · Physics 2014-11-19 Mark G. Alford , Hiromichi Nishimura , Armen Sedrakian

The thermal conductivity of polycrystalline samples of (Na,Ca)Co_2O_4 is found to be unusually low, 20 mW/cmK at 280 K. On the assumption of the Wiedemann-Franz law, the lattice thermal conductivity is estimated to be 18 mW/cmK at 280 K,…

Strongly Correlated Electrons · Physics 2009-10-31 K. Takahata , Y. Iguchi , D. Tanaka , T. Itoh , I. Terasaki

Owing to their long phonon mean free paths (MFPs) and high thermal conductivity, carbon nanotubes (CNTs) are ideal candidates for, e.g., removing heat from electronic devices. It is unknown, however, how the intrinsic phonon MFPs depend on…

Mesoscale and Nanoscale Physics · Physics 2015-03-23 K. Sääskilahti , J. Oksanen , S. Volz , J. Tulkki

We report an enhancement of thermal conductivity ($\kappa$) below the superconducting transition temperature ($T_C$) in the high carrier density $\beta$-V$_{1-x}$Ti$_x$ alloys. We find that the point defects generated when Ti is added to V…

Superconductivity · Physics 2019-08-21 Sabyasachi Paul , L. S. Sharath Chandra , M. K. Chattopadhyay

Inelastic light scattering studies on single crystal of electron-doped Ca(Fe0.95Co0.05)2As2 superconductor, covering the tetragonal to orthorhombic structural transition as well as magnetic transition at TSM ~ 140 K and superconducting…

At very high densities, QCD is in the color-flavor-locked phase, which is a color-superconducting phase. The diquark condensates break chiral symmetry in the same way as it is broken in vacuum QCD and gives rise to an octet of…

High Energy Physics - Phenomenology · Physics 2015-05-20 Lars E. Leganger

Thermal conductivities $\Lambda $ of amorphous carbon thin films are measured in the temperatures range 80--400 K using the $3\omega $ method. Sample films range from soft a-C:H prepared by remote-plasma deposition ($\Lambda = 0.20$ W…

Materials Science · Physics 2009-10-31 Andrew J. Bullen , Keith E. O'Hara , David G. Cahill , Othon Monteiro , Achim von Keudell

We calculate neutrino emissivities from the decay and scattering of Goldstone bosons in the color-flavor-locked (CFL) phase of quarks at high baryon density. Interactions in the CFL phase are described by an effective low-energy theory. For…

Astrophysics · Physics 2009-11-07 Prashanth Jaikumar , Madappa Prakash , Thomas Schaefer

We compute the thermal conductivity and sound attenuation length of a dilute atomic Fermi gas in the framework of kinetic theory. Above the critical temperature for superfluidity, T_c, the quasi-particles are fermions, whereas below T_c,…

Quantum Gases · Physics 2015-03-13 Matt Braby , Jingyi Chao , Thomas Schaefer

Based on first-principles calculations and full iterative solution of the linearized Boltzmann-Peierls transport equation for phonons within three-phonon scattering framework, we characterize the lattice thermal conductivities $\kappa$ of…

Materials Science · Physics 2015-06-30 Youdi Kuang , Lucas Lindsay , Sanqiang Shi , Xinjiang Wang , Ruiqiang Guo , Baoling Huang

We theoretically estimate the electron-phonon coupling constant lambda for metallic single-walled carbon nanotubes with a diameter of 1.4 nm. The partial electron-phonon coupling constant for the hardest phonon mode is estimated to be about…

Superconductivity · Physics 2007-05-23 Guo-meng Zhao

A fundamental understanding of phonon transport in stanene is crucial to predict the thermal performance in potential stanene-based devices. By combining first-principle calculation and phonon Boltzmann transport equation, we obtain the…

Materials Science · Physics 2016-02-23 Bo Peng , Hao Zhang , Hezhu Shao , Yuchen Xu , Xiangchao Zhang , Heyuan Zhu

Thermal conductivity measurements over variable lengths on nanostructures such as nanowires provide important information about the mean free paths (MFPs) of the phonons responsible for heat conduction. However, nearly all of these…

Mesoscale and Nanoscale Physics · Physics 2015-02-23 Hang Zhang , Chengyun Hua , Ding Ding , Austin J. Minnich

The "textbook" phonon mean free path (MFP) of heat carrying phonons in silicon at room temperature is ~40 nm. However, a large contribution to the thermal conductivity comes from low-frequency phonons with much longer MFPs. We present a…

We study the weak interaction rates involving Goldstone bosons in the Color Flavor Locked (CFL) quark matter. Neutrino mean free path and the rate of energy loss due to neutrino emission in a thermal plasma of CFL pions and kaons is…

Nuclear Theory · Physics 2008-11-26 Sanjay Reddy , Mariusz Sadzikowski , Motoi Tachibana

We report a theoretical analysis of the phonon thermal conductance, \kappa (T), for single wall carbon nanotubes (SWCN). In a range of low temperatues up to 100K, \kappa (T) of perfect SWCN is found to increase with temperature,…

Strongly Correlated Electrons · Physics 2009-11-07 Qing-Rong Zheng , Gang Su , Jian Wang , Hong Guo

The r-mode instability in rotating compact stars is used to constrain the phase of matter at high density. The color-flavor-locked phase with kaon condensation (CFL-K0) and without (CFL) is considered in the temperature range 10^8K < T…

Nuclear Theory · Physics 2010-12-02 Gautam Rupak , Prashanth Jaikumar