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We engineer a large new set of four-dimensional N=1 superconformal field theories by wrapping M5-branes on complex curves. We present new supersymmetric AdS_5 M-theory backgrounds which describe these fixed points at large N, and then…

高能物理 - 理论 · 物理学 2012-06-05 Ibrahima Bah , Christopher Beem , Nikolay Bobev , Brian Wecht

A comparative study of wurtzite ZnO doped by rare earth elements (Tm, Yb, Ce) have been investigated using density functional theory (DFT) based on the full-potential linearized augmented plane wave orbital (FP-LAPW) method, as implemented…

材料科学 · 物理学 2020-04-23 M. Khuili , N. Fazouan , H. Abou El Makarim , E. H. Atmani , D. P. Rai , M. Houmad

This work reports a 'Density Functional Theory' (DFT) calculation of PAH molecules with a five-member ring to determine the expected region of infrared features. It is highly possible that fullerene molecule might be originated from…

星系天体物理 · 物理学 2019-02-28 Gauri Devi , Mridusmita Buragohain , Amit Pathak

Here we a present a density functional theory study of pentacene ultra-thin films on flat [(111)] and vicinal [(455)] Au surfaces. We have performed crystal and electronic structure calculations by using PBE and optB86b-vdW functionals and…

材料科学 · 物理学 2020-05-20 Ersen Mete , Mehmet Fatih Danisman

Krueger some years ago proposed a cluster LiBeBCNOF, now called periodane. His ground-state isomer proposal has recently been refined by Bera et al. using DFT. Here, we take the approach of molecules in such a cluster as starting point. We…

其他凝聚态物理 · 物理学 2008-04-10 G. Forte , A. Grassi , G. M. Lombardo , G. G. N. Angilella , N. H. March , R. Pucci

The adsorption geometry of 1,3,5-tris(4-mercaptophenyl)benzene (TMB) on Cu(111) is determined with high precision using two independent methods, experimentally by quantitative low energy electron diffraction (LEED-I(V)) and theoretically by…

Most theoretical studies of nanoscale transport in molecular junctions rely on the combination of the Landauer formalism with Kohn-Sham density functional theory (DFT) using standard local and semilocal functionals to approximate exchange…

介观与纳米尺度物理 · 物理学 2017-03-29 Tonatiuh Rangel , Andrea Ferretti , Valerio Olevano , Gian-Marco Rignanese

Nanoparticles have become increasingly interesting for a wide range of applications, because in principle it is possible to tailor their properties by controlling size, shape and composition. One of these applications is heterogeneous…

材料科学 · 物理学 2021-06-22 Jan Weinreich , Martín Leandro Paleico , Jörg Behler

A proper theoretical description of electronic structure of the 3d orbitals in the metal centers of functional metalorganics is a challenging problem. In this letter, we apply density functional theory and an exact diagonalization method in…

Asymmetric nuclear matter is investigated in the low density region below the nuclear saturation density. Microscopic calculations based on the Dirac Brueckner Hartree-Fock (DBHF) approach with realistic nucleon-nucleon potentials are used…

核理论 · 物理学 2008-11-26 J. Margueron , E. Van Dalen , C. Fuchs

We discover the detailed atomic structure of $d$-MgZnY, a stable decagonal quasicrystal alloy of the layered Frank-Kasper type, and related phases, using the "tiling and decoration" approach. The atoms have invariable sites in the rectangle…

材料科学 · 物理学 2011-12-19 M. Mihalkovic , C. L. Henley , J. Richmond-Decker , M. Oxborrow

We point out that single electron charging effects such as Coulomb Blockade (CB) and high-bias staircases play a crucial role in transport through single ultrashort molecules. A treatment of Coulomb Blockade through a prototypical molecule,…

介观与纳米尺度物理 · 物理学 2009-11-11 Bhaskaran Muralidharan , Avik W Ghosh , Swapan K Pati , Supriyo Datta

The work presents the electronic structure, spin state and optical properties of TM-dinuclear molecules (TM = Cr, Mn, Fe, Co, and Ni) which was modelled according to the recently reported Pt$^{II}$-dinuclear complex…

材料科学 · 物理学 2019-12-19 Indukuru Ramesh Reddy , Kartick Tarafder

The production of multiple types of graphene, such as free standing, epitaxial graphene on silicon carbide and metals, graphene in solution, chemically grown graphene-like molecules, various graphene nanoribbons, and graphene oxide with…

材料科学 · 物理学 2013-01-14 D. W. Boukhvalov

The phase field crystal (PFC) method has emerged as a promising technique for modeling materials with atomistic resolution on mesoscopic time scales. The approach is numerically much more efficient than classical density functional theory…

材料科学 · 物理学 2015-05-18 Michael Greenwood , Nikolas Provatas , Jörg Rottler

The electronic conductance of a benzene molecule connected to gold electrodes via thiol, thiolate, and amino anchoring groups is calculated using nonequilibrium Green functions in combination with the fully selfconsistent GW approximation.…

介观与纳米尺度物理 · 物理学 2015-03-18 M. Strange , C. Rostgaard , H. Hakkinen , K. S. Thygesen

Machine learning has emerged as a novel tool for the efficient prediction of materials properties, and claims have been made that machine-learned models for the formation energy of compounds can approach the accuracy of Density Functional…

We demonstrate a new class of molecules for exceptional performance in molecular electronics and spintronics. Phenalenyl-based radicals are stable radicals whose electronic properties can be tuned readily by heteroatom substitution. We…

介观与纳米尺度物理 · 物理学 2021-11-24 Manuel Smeu , Oliver L. A. Monti , Dominic McGrath

Computational protein structure determination involves optimization in a problem space much too large to exhaustively search. Existing approaches include optimization algorithms such as gradient descent and simulated annealing, but these…

分布式、并行与集群计算 · 计算机科学 2020-08-04 Michael Bryson , Xijiang Miao , Homayoun Valafar

Recently, a new two-dimensional carbon allotrope, named biphenylene network (BPN) was experimentally realized. The BPN structure is composed of four-, six-, and eight-membered rings of sp$^2$-hybridized carbon atoms. In this work, we…