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The charmonium states at non-zero temperature are studied on anisotropic lattices with 2 dynamical quark flavours. Non-local operators are used to determine the Nambu-Bethe-Salpeter (NBS) wavefunctions via both conventional fitting methods…

高能物理 - 格点 · 物理学 2013-06-14 C. R. Allton , P. W. M. Evans , J. -I. Skullerud

Optical lattices have emerged as ideal simulators for Hubbard models of strongly correlated materials, such as the high-temperature superconducting cuprates. In optical lattice experiments, microscopic parameters such as the interaction…

量子气体 · 物理学 2011-06-23 D. McKay , B. DeMarco

Materials tuned to a quantum critical point display universal scaling properties as a function of temperature $T$ and frequency $\omega$. A long-standing puzzle regarding cuprate superconductors has been the observed power-law dependence of…

强关联电子 · 物理学 2023-05-29 B. Michon , C. Berthod , C. W. Rischau , A. Ataei , L. Chen , S. Komiya , S. Ono , L. Taillefer , D. van der Marel , A. Georges

The incoherent dynamic structure factor of ortho-terphenyl has been measured by neutron time-of-flight and backscattering technique in the pressure range from 0.1 MPa to 240 MPa for temperatures between 301 K and 335 K. Tagged-particle…

统计力学 · 物理学 2011-04-05 A. Toelle , H. Schober , J. Wuttke , F. Fujara

High-resolution neutron backscattering techniques are exploited to study the elastic and quasi-elastic response of the high-density amorphous (HDA), the low-density amorphous (LDA) and the crystalline ice Ic upon temperature changes. Within…

无序系统与神经网络 · 物理学 2017-09-13 Michael Marek Koza , Burkhard Geil , Helmut Schober , Francesca Natali

The frequency dependence of dielectric constant for composites of polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) with different degree of functionalization is studied at low temperature (down to 4.2 K) and magnetic field (up to…

无序系统与神经网络 · 物理学 2021-09-02 Krishna Prasad Maity , Ananya Patra , Narendra Tanty , V Prasad

The instability of a Fermi surface against Ising nematic order destroys the quasiparticle character of the low-energy degrees of freedom. Therefore, observables exhibit deviations from Fermi liquid behavior which gives rise to the term…

强关联电子 · 物理学 2020-11-17 Bernhard Frank , Francesco Piazza

We experimentally and theoretically study the peak fraction of a Bose-Einstein condensate loaded into a cubic optical lattice as the lattice potential depth and entropy per particle are varied. This system is well-described by the…

量子气体 · 物理学 2015-06-23 David McKay , Ushnish Ray , Stefan Natu , Philip Russ , David Ceperley , Brian DeMarco

$\alpha$-RuCl$_3$ is a leading material for proximate Kitaev magnetism. We address the origin of the broad, $\Gamma$-point centered excitation continuum observed by inelastic neutron scattering at elevated temperatures in this compound.…

材料科学 · 物理学 2026-02-12 Chaebin Kim , Martin Mourigal

Using high temperature expansions for the equal time correlator $S(q)$ and static susceptibility $\chi(q)$ for the t-J model, we present evidence for quantum critical (QC), $z\!=\!1$, behavior at intermediate temperatures in a broad range…

凝聚态物理 · 物理学 2009-10-22 Alexander Sokol , Rodney L. Glenister , Rajiv R. P. Singh

Vibrational dephasing of nitrogen molecule is known to show highly interesting anomalies near its gas-liquid critical point. Here we present theoretical and computational studies of the Raman linewidth of nitrogen along the critical…

化学物理 · 物理学 2007-05-23 Swapan Roychowdhury , Biman Bagchi

We study magnetic, transport and thermal properties of Cobalt carbide nanocomposite with a mixture of Co2C and Co3C phases in 1:1 ratio, with an average particle diameter of 40$\pm 15$ nm. We show that the behavior of the nanocomposite is…

强关联电子 · 物理学 2020-03-31 Nirmal Roy , Arpita Sen , Prasenjit Sen , S. S. Banerjee

The electronic nematic phase, wherein electronic degrees of freedom lower the crystal rotational symmetry, is a common motif across a number of high-temperature superconductors. However, understanding the role and influence of nematicity…

We introduce a combined Restrained MD/Parallel Tempering approach to study the difference in free energy as a function of a set of collective variables between two states in presence of unknown slow degrees of freedom. We applied this…

统计力学 · 物理学 2015-03-19 Simone Meloni , Sergio Orlandini , Giovanni Ciccotti

With gravity, ionization, and radiation being considered, we perform 2.5D compressible resistive MHD simulations of chromospheric magnetic reconnection using the CIP-MOCCT scheme. The temperature distribution of the quiet-Sun atmospheric…

太阳与恒星天体物理 · 物理学 2015-03-17 R. L. Jiang , C. Fang , P. F. Chen

We report the results of low-temperature measurements of the specific heat Cp(T), ac susceptibility chi(T) and 23Na nuclear magnetic resonance NMR of Na2V3O7. At liquid He temperatures Cp(T)/T exhibits broad field-dependent maxima, which…

强关联电子 · 物理学 2009-11-11 J. L. Gavilano , E. Felder , D. Rau , H. R. Ott , P. Millet , F. Mila , T. Cichorek , A. C. Mota

The nature of the pseudogap and its relationship with superconductivity are one of the central issues of cuprate superconductors. Recently, a possible scenario has been proposed that the pseudogap state is a distinct phase characterized by…

We have measured depolarized light scattering in liquid benzene over the whole accessible temperature range and over four decades in frequency. Between 40 and 180 GHz we find a susceptibility peak due to structural relaxation. This peak…

软凝聚态物质 · 物理学 2011-04-05 Sabine Wiebel , Joachim Wuttke

We present neutron scattering measurements on single crystals of lightly doped $La_{2-x}Ba_{x}CuO_{4}$, with $0 \leq x \leq? 0.035$. These reveal the evolution of the magnetism in this prototypical doped Mott insulator from a three…

We determine the magnetic phase diagram for the YBa$_2$Cu$_3$O$_{6+x}$ and La$_{2-x}$Sr$_x$CuO$_4$ systems from various NMR experiments. We discuss the possible interpretation of NMR and neutron scattering experiments in these systems in…

凝聚态物理 · 物理学 2009-10-28 V. Barzykin , D. Pines