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Journal of Physics. Condensed Matter: An Institute of Physics Journal

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https://www.readbyqxmd.com/read/28327468/preface-for-the-special-issue-on-complex-fluids-at-structured-surfaces
#1
Julia Yeomans, Paulo I C Teixeira
Does not apply.
March 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28327465/anomalous-rashba-spin-orbit-interaction-in-electrically-controlled-topological-insulator-based-on-inn-gan-quantum-wells
#2
S P Lepkowski, Witold Bardyszewski
We study theoretically the topological phase transition and the Rashba spin-orbit interaction in electrically biased InN/GaN quantum wells. We show that that for properly chosen widths of quantum wells and barriers, one can effectively tune the system through the topological phase transition applying an external electric field perpendicular to the QW plane. We find that in InN/GaN quantum wells with the inverted band structure, when the conduction band s-type level is below the heavy hole and light hole p-type levels, the spin splitting of the subbands decreases with increasing the amplitude of the electric field in the quantum wells, which reveals the anomalous Rashba effect...
March 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323639/the-effect-of-boundary-slippage-and-nonlinear-rheological-response-on-flow-of-nanoconfined-water
#3
Amandeep Sekhon, V J Ajith, Shivprasad Vitthal Patil
The flow of water confined to nanometer-sized pores is central to a wide range of subjects from biology to nanofluidic devices. Despite its importance, a clear picture about nanoscale fluid dynamics is yet to emerge. Here we measured dissipation in less than 20 nm thick water films and it was found to decrease for both wetting and non-wetting confining surfaces. The fitting of Carreau-Yasuda model of shear thinning to our measurements implies that flow is non-Newtonian and for wetting surfaces the no-slip boundary condition is valid...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323635/magnetic-states-of-mnp-muon-spin-rotation-studies
#4
R Khasanov, A Amato, P Bonfà, Z Guguchia, H Luetkens, E Morenzoni, R De Renzi, N D Zhigadlo
Muon-spin rotation data collected at ambient pressure (p) and at p  =  2.42 GPa in MnP were analyzed to check their consistency with various low- and high-pressure magnetic structures reported in the literature. Our analysis confirms that in MnP the low-temperature and low-pressure helimagnetic phase is characterised by an increased value of the average magnetic moment compared to the high-temperature ferromagnetic phase. An elliptical double-helical structure with a propagation vector [Formula: see text], an a-axis moment elongated by approximately 18% and an additional tilt of the rotation plane towards c-direction by [Formula: see text]-8° leads to a good agreement between the theory and the experiment...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323634/effect-of-laser-pulse-propagation-on-ultrafast-magnetization-dynamics-in-a-birefringent-medium
#5
J A de Jong, A M Kalashnikova, R V Pisarev, A M Balbashov, A V Kimel, A Kirilyuk, Th Rasing
Light propagation effects can strongly influence the excitation and the detection of laser-induced magnetization dynamics. We investigated experimentally and analytically the effects of crystallographic linear birefringence on the excitation and detection of ultrafast magnetization dynamics in the rare-earth orthoferrites (Sm0.5Pr0.5)FeO3 and (Sm0.55Tb0.45)FeO3, which possess weak and strong linear birefringence, respectively. Our finding is that the effect of linear birefringence on the result of a magneto-optical pump-probe experiment strongly depends on the mechanism of excitation...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323632/exposure-of-pt-5%C3%A2-5%C3%A2-3-and-rh-1%C3%A2-1%C3%A2-1-to-atomic-and-molecular-oxygen-do-defects-enhance-subsurface-oxygen-formation
#6
Rachael G Farber, Marie E Turano, Eleanor C N Oskorep, Noelle T Wands, Ludo B F Juurlink, Daniel R Killelea
Subsurface oxygen is known to form in transition metals, and is thought to be an important aspect of their ability to catalyze chemical reactions. The formation of subsurface oxygen is not, however, equivalent across all catalytically relevant metals. As a result, it is difficult to predict the stability and ease of the formation of subsurface oxygen in metals, as well as how the absorbed oxygen affects the chemical and physical properties of the metal. In comparing how a stepped platinum surface, Pt(5 5 3), responds to exposure to gas-phase oxygen atoms under ultra-high vacuum conditions to planar Rh(1 1 1), we are able to determine what role, if any, steps have on the capacity of a metal for subsurface oxygen formation...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323631/search-for-unconventional-superconductors-among-the-y-i-te-i-sub-2-sub-si-sub-2-sub-compounds-i-te-i-cr-co-ni-rh-pd-pt
#7
Adam P Pikul, Malgorzata Samsel-Czekala, Grzegorz Chajewski, Tetiana Romanova, Alicja Hackemer, Roman Gorzelniak, Piotr Wiśniewski, Dariusz Kaczorowski
Motivated by the recent discovery of exotic superconductivity in YFe<sub>2</sub>Ge<sub>2</sub> we undertook reinvestigation of formation and physical properties of yttrium-based 1:2:2 silicides. Here we report on syntheses and crystal structures of the Y<i>TE</i><sub>2</sub>Si<sub>2</sub> compounds with <i>TE</i> = Cr, Co, Ni, Rh, Pd, and Pt, and their low-temperature physical properties measurements, supplemented by results of fully relativistic FPLO band structure calculations...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28323250/the-atomic-simulation-environment-a-python-library-for-working-with-atoms
#8
Ask Larsen, Jens Mortensen, Jakob Blomqvist, Ivano Castelli, Rune Christensen, Marcin Dulak, Jesper Friis, Michael Groves, Bjork Hammer, Cory Hargus, Eric Hermes, Paul Jennings, Peter Jensen, James Kermode, John Kitchin, Esben Kolsbjerg, Joseph Kubal, Kristen Kaasbjerg, Steen Lysgaard, Jon Maronsson, Tristan Maxson, Thomas Olsen, Lars Pastewka, Andrew Peterson, Carsten Rostgaard, Jakob Schiøtz, Ole Schütt, Mikkel Strange, Kristian Thygesen, Tejs Vegge, Lasse Vilhelmsen, Michael Walter, Zhenhua Zeng, Karsten Wedel Jacobsen
The Atomic Simulation Environment (ASE) is a software package written in the Python programming language with the aim of setting up, steering, and analyzing atomistic simula- tions. In ASE, tasks are fully scripted in Python. The powerful syntax of Python combined with the NumPy array library make it possible to perform very complex simulation tasks. For example, a sequence of calculations may be performed with the use of a simple "for-loop" construction. Calculations of energy, forces, stresses and other quantities are performed through interfaces to many external electronic structure codes or force fields using a uniform interface...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28322214/optical-signatures-of-parity-anomaly-in-a-gapped-graphene-like-system
#9
C X Zhang, X G Qiu
Parity anomaly refers to the violation of coordinate reflection symmetry induced by the quantum fluctuations. It is proposed to exist in a graphene-like system with a finite bare mass for Dirac fermions, and manifests itself as a parity- violating quantum correction to the current of each species of fermions. Coulomb interaction greatly increases the fermion mass, and produces various types of excitons. Of particular interest is the ρ-exciton, which is directly connected to parity anomaly and can be generated by absorbing a specific photon...
March 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28319035/synthesis-and-properties-of-cs-i-sub-x-i-sub-f-i-sub-y-i-sub-thin-films-deposited-by-reactive-magnetron-sputtering-in-an-ar-sf-sub-6-sub-discharge
#10
Chung-Chuan Lai, Cecilia Goyenola, Esteban Broitman, Lars-Åke Näslund, Hans Hogberg, Lars Hultman, Gueorgui Gueorguiev, Johanna Rosen
A theoretical and experimental study on the growth and properties of a ternary carbon-based material, CS<sub><i>x</i></sub>F<sub><i>y</i></sub>, synthesized from SF<sub>6</sub> and C as primary precursors is reported. The synthetic growth concept was applied to model the possible species resulting from the fragmentation of SF<sub>6</sub> molecules and the recombination of S-F fragments with atomic C. The possible species were further evaluated for their contribution to the film growth...
March 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28317796/quantum-statistics-for-a-two-mode-magnon-system-with-microwave-pumping-application-to-coupled-ferromagnetic-nanowires
#11
Zahra Haghshenasfard, Michael G Cottam
A microscopic (Hamiltonian-based) method for the quantum statistics of bosonic excitations in a two-mode magnon system is developed. Both the exchange and the dipole-dipole interactions, as well as the Zeeman term for an external applied field, are included in the spin Hamiltonian, and the model also contains the nonlinear effects due to parallel pumping and four-magnon interactions. The quantization of spin operators is achieved through the Holstein-Primakoff formalism, and then a coherent magnon state representation is used to study the occupation magnon number and the quantum statistical behaviour of the system...
March 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28306549/magic-angle-spinning-nmr-study-of-the-ferroelectric-transition-of-kh2po4-definitive-evidence-of-a-displacive-component
#12
Jin Jung Kweon, Riqiang Fu, Eun Sang Choi, Naresh S Dalal
Variable temperature magic angle spinning (MAS) NMR measurements are reported on (1)H and (31)P nuclei in KH2PO4 (KDP) in the vicinity of its paraelectric-ferroelectric phase transition temperature, T c, of 123 K, to examine the transition mechanism, in particular if this is a model order-disorder type or whether it also involves a displacive component. It has been well established that the temperature variation of the isotropic chemical shift, δ iso, in NMR measurements of the nuclei directly involved in the transition should remain constant or change smoothly through T c for an order-disorder type transition but it should show an anomalous change for a displacive one...
March 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28303798/configuration-of-a-smectic-a-liquid-crystal-due-to-an-isolated-edge-dislocation
#13
Ben Snow, Iain Stewart
We discuss the static configuration of a smectic A liquid crystal subject to an edge dislocation under the assumption the the director and layer normal fields (<b>n</b> and <b>a</b>, respectively) defining the smectic arrangement are not, in general, equivalent. After constructing the energy density for the smectic, we obtain exact solutions to the equilibrium equations which result from its minimisation at quadratic order in the variables which describe the distortion, and hence a complete description of the smectic configuration across the domain of the sample...
March 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28300043/low-energy-theory-for-strained-graphene-an-approach-up-to-second-order-in-the-strain-tensor
#14
Maurice Oliva-Leyva, Chumin Wang
An analytical study of low-energy electronic excited states in uniformly strained graphene is carried out up to second-order in the strain tensor. We report a new effective Dirac Hamiltonian with an anisotropic Fermi velocity tensor, which reveals the graphene trigonal symmetry being absent in first-order low-energy theories. In particular, we demonstrate the dependence of the Dirac-cone elliptical deformation on the stretching direction with respect to graphene lattice orientation. We further analytically calculate the optical conductivity tensor of strained graphene and its transmittance for a linearly polarized light with normal incidence...
March 16, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28300042/polydomain-structures-in-ferroelectric-and-ferroelastic-epitaxial-films
#15
Alexander L Roytburd, Jun Ouyang, Andrei Artemev
A review of theoretical models, phase field modeling and experimental studies of domain structures in epitaxial films is presented. The thermodynamic theory of such domain structures is presented within the macroscopic thermo-mechanical framework. The theory allows for the evaluation of the main parameters of the domain structure using the energy minimization approach applied to the energy of elastic interactions. For homophase (polytwin) films, the thermodynamic theory provides a quantitative tool that can be used to estimate domain fractions in the film and the type of domain structure architecture...
March 16, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28300040/spin-liquid-and-infinitesimal-disorder-driven-cluster-spin-glass-in-the-kagome-lattice
#16
M Schmidt, F M Zimmer, S G Magalhaes
The interplay between geometric frustration (GF) and bond disorder is studied in the Ising kagome lattice within a cluster approach. The model considers antiferromagnetic short-range couplings and long-range intercluster disordered interactions. The replica formalism is used to obtain an effective single cluster model from where the thermodynamics is analyzed by exact diagonalization. We found that the presence of GF can introduce cluster freezing at very low levels of disorder. The system exhibits an entropy plateau followed by a large entropy drop close to the freezing temperature...
March 16, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28294108/on-the-correct-interpretation-of-the-low-voltage-region-in-intrinsic-single-carrier-devices
#17
Jason Alexander Rohr, Thomas Kirchartz, Jenny Nelson
We discuss the approach of determining the charge-carrier density of a single-carrier device by combining Ohm's law and the Mott-Gurney law. We show that this approach is seldom valid, due to the fact that whenever Ohm's law is applicable the Mott-Gurney law is usually not, and vice versa. We do this using a numerical drift-diffusion solver to calculate the current density-voltage curves and the charge-carrier density, with increasing doping concentration. As this doping concentration is increased to very large values, using Ohm's law becomes a sensible way of measuring the product of mobility and doping density in the sample...
March 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28294106/coherent-and-incoherent-charge-transport-in-linear-triple-quantum-dots
#18
L Debora Contreras-Pulido, Martin Bruderer
One of the fundamental questions in quantum transport is how charge transfer through complex nanostructures is influenced by quantum coherence. We address this issue for linear triple quantum dots by comparing a Lindblad density matrix description with a Pauli rate equation approach and analyze the corresponding zero-frequency counting statistics of charge transfer. The impact of decaying coherences of the density matrix due to dephasing is also studied. Our findings reveal that the sensitivity to coherence shown by shot noise and skewness, in particular in the limit of large coupling to the drain reservoir, can be used to unambiguously evidence coherent processes involved in charge transport across triple quantum dots...
March 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28294103/multi-scale-approach-for-strain-engineering-of-phosphorene
#19
Daniel Midtvedt, Caio Lewenkopf, Alexander Croy
A multi-scale approach for the theoretical description of deformed phosphorene is presented. This approach combines a valence-force model to relate macroscopic strain to microscopic displacements of atoms and a tight-binding model with distance-dependent hopping parameters to obtain electronic properties. The resulting self-consistent electromechanical model is suitable for large-scale modeling of phosphorene devices. We demonstrate this for the case of inhomogeneously deformed phosphorene drum, which may be used as an exciton funnel...
March 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28291742/first-principles-study-of-methane-decomposition-on-b5-step-edge-type-site-of-ru-surface
#20
Ryan Arevalo, Susan Aspera, Mary Clare Escaño, Hiroshi Nakanishi, Hideaki Kasai
Many chemical reactions that produce a wide range of hydrocarbons and alcohols involve the breaking of C-H bonds in methane. In this paper, we analyzed the decomposition of this molecule on the B5 step-edge type site of Ru surface using first principles calculations based on dispersion-corrected density functional theory. Methane was found to be weakly adsorbed on the surface, characterized by the hybridization of its sp states with Ru-d<sub>xz,yz,zz</sub> states. Dissociative adsorption is energetically preferred over molecular methane adsorption, resulting in CH fragment...
March 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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