journal

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

journal
#1
Irina Margaritescu, Kaustuv Datta, Boriana Mihailova
Temperature-dependent Raman spectroscopic analyses were performed for the prominent ferroelectric PbTiO&lt;sub&gt;3&lt;/sub&gt; in the temperature range 130-1040 K, focusing particularly on its paraelectric state above the Curie temperature T&lt;sub&gt;C&lt;/sub&gt; ~763 K. The temperature evolution of the anomalous Raman scattering reveals that not only local ferroic distortions persist at temperatures well above T&lt;sub&gt;C&lt;/sub&gt;, but also there is a sequence of different coupling processes preceding the appearance of long-range ferroelectric order at T&lt;sub&gt;C&lt;/sub&gt;...
September 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#2
Mathias Bersweiler, Karine Dumesnil, Yannick F R Fagot-Revurat, Patrick Le Fèvre, Coriolan Tiusan, Lacour Daneil, Michel Hehn
The electronic structure of (111) Sm&lt;sub&gt;1-x&lt;/sub&gt;Gd&lt;sub&gt;x&lt;/sub&gt;Al&lt;sub&gt;2&lt;/sub&gt;, a zero-magnetization ferromagnet, is investigated by angle- and spin- resolved photoemission spectroscopy. An intense electron pocket strongly localized around Γ point and close to the Fermi level is observed and analyzed in details. Its various characteristics, combined with electronic structure calculations, reveal a resonant surface state of 5&lt;i&gt;d&lt;/i&gt; character and Λ&lt;sub&gt;1&lt;/sub&gt; symmetry, likely built on bulk states developing around L points...
September 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#3
Konstantinos Konstantinou, Felix Cosmin Mocanu, Tae Hoon Lee, Steve R Elliott
Ion irradiation corresponds to a process that involves the production of non-equilibrium cascades in the host material, and the atomistic modelling of such events in glasses is challenging. Here, non-equilibrium cascades in amorphous Ge&lt;sub&gt;2&lt;/sub&gt;Sb&lt;sub&gt;2&lt;/sub&gt;Te&lt;sub&gt;5&lt;/sub&gt; phase-change memory material have been investigated by means of first-principles molecular-dynamics simulations. A stochastic boundary-conditions approach is employed to treat the thermal nature of the cascades and drive the modelled system back to equilibrium in a natural way, while four different initial thermal-spike energies are considered...
September 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#4
Abhijit Suhas Pendse, Arijit Bhattacharyay
We consider a Bose-Einstein Condensate(BEC) with non-local inter-particle interactions. The&#13; local Gross-Pitaevskii (GP) equation is valid for the gas parameter ν =: a 3 n 0 &lt;&lt; 1, but for ν → 1,&#13; the BEC is described by modified GP equation(MGPE). We study the exact solutions of the MGPE&#13; describing bright and dark solitons. It turns out that the width of these non-local solitons has&#13; qualitatively similar behaviour as the modified healing length due to the non-local interactions of&#13; the MGPE...
September 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#5
Johannes Frantti, Yukari Fujioka, Jamie Molaison, R Boehler, Bianca Haberl, Christopher Tulk, Antonio Moreira Dos Santos
Switchable atomic displacements generate electric dipole moments in ferroelectric materials utilized in many contemporary devices. Lead titanate, a perovskite oxide with formula PbTiO3, has been referred to as a textbook example of a prototype displacive ferroelectric and is a testing platform of widely used models of piezoelectric response of complex solid-solutions. PbTiO3 has been addressed by experimental and computational studies, often with apparently conflicting conclusions. To date, hydrostatic pressure experiments have been interpreted in terms of a model in which the dipole moments gradually diminish with increasing pressure until a transition to a cubic phase, characterized by a zero average dipole moment, occurs...
September 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#6
Nabi Aghdassi, P Kruger, Steffen Linden, Dorothea Dulson, Helmut Zacharias
A combined theoretical and multi-technique experimental study was employed to comprehensively determine the electronic structure of 6H-SiC(0001) surfaces upon hydroxyl and oxygen termination. We demonstrate the UV-induced formation of single-coordinated oxygen radicals in on-top (OT) sites above the atoms of the uppermost silicon layer of the substrate on initially hydroxyl-terminated SiC. A suchlike configuration of oxygen radicals represents an unprecedented adsorbate-derived system of unpaired electrons, bearing analogy to silicon and carbon dangling bonds on clean, unreconstructed SiC surfaces...
September 20, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#7
Harikrishnan Sasidharan Nair, Chogondalli Muniraju Naveen Kumar, D T Adroja, Clemens Ritter, Andrew S Wills, Winfried A Kockelmann, Pascale P Deen, Amitava Bhattacharyya, Andre M Strydom
The magnetic structure of the ternary equiatomic intermetallic compound&#13; PrCuSi is investigated using neutron powder diffraction experiments in 0~T &#13; as well as in external magnetic fields up to 2~T.&#13; The PrCuSi compound crystallizes in the hexagonal Ni$_2$In-type structure, &#13; in the space group $P6_3/mmc$. In this structure, cationic ordering of Cu and &#13; Si takes place. The antiferromagnetic phase transition in the Pr sublattice &#13; takes place at $T_N$ = 5.1~K in 0~T...
September 19, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#8
Taichi Kosugi, Yu-Ichiro Matsushita
For a three-electron system with finite-strength interactions confined to a one-dimensional harmonic trap,&#13; we solve the Schroedinger equation analytically to obtain the exact solutions,&#13; from which we construct explicitly the simultaneous eigenstates of&#13; the energy and total spin for the first time.&#13; The solutions for the three-electron system allow us to derive analytic expressions for the exact one-particle Green's function (GF) for the corresponding two-electron system.&#13; We calculate the GF in frequency domain to examine systematically its behavior depending on the electronic interactions...
September 19, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#9
Guangkun Liu, Shichao Fang, Xiaojun Zheng, Zhong-Bing Huang, Haiqing Lin
To understand the interplay between nematic fluctuation and superconductivity in iron-based superconductors, we performed a systematic study of the realistic two-orbital Hubbard model at intermedium correlation regimes by using the constrained-path quantum Monte Carlo method. Our numerical results showed that the on-site nematic interaction induces a strong enhancement of nematic fluctuations at various momentums, especially at (pi,pi). Simultaneously, it was found that the on-site nematic interaction suppresses the (pi,0)/(0,pi) antiferromagnetic order and long-range electron pairing correlations for dominant pairing channels in iron-based superconductors...
September 19, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#10
Yonatan Betancur Ocampo
Ballistic heterojunctions of Dirac materials offer the opportunity of exploring optics-like phenomena in electronic systems. In this paper, a new perfect lens through special positive refraction is predicted with omnidirectional Klein tunneling of massless Dirac fermions. The novel optics component called a super-diverging lens (SDL) is the counterpart of a Veselago lens (VL). The use of SDL and VL creates a device that simulates the ocular vision. This atypical refraction is due to electrons obeying different Snell's laws of pseudo-spin and group velocity in heterojunctions with elliptical Dirac cones...
September 19, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#11
Ying-Hua Deng, Hai-Feng Lv, Sha-Sha Ke, Yong Guo, Huai-Wu Zhang
We investigate the Kondo effect of a spin-$1/2$ magnetic impurity in a topological nodal loop semimetal, in which band touchings form nodal loop. The Fermi surface of a nodal loop semimetal is a torus or a drum-like structure, which is determined by the chemical potential. When the chemical potential lies at the nodal loop ($\mu$=$0$), the magnetic impurity and the conduction electrons form bound states only if their coupling exceeds a critical value. As the chemical potential is tuned away from the nodal loop, the Fermi surface becomes a torus or drum-like structure and the impurity and the host material always favor a bound state due to the finite density of state...
September 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#12
Yanxia Xing, Fuming Xu, Qingfeng Sun, Jian Wang, Yugui Yao
An intriguing observation on the quantum anomalous Hall effect(QAHE) in magnetic topological insulators (MTIs) is the dissipative edge states, where quantized Hall resistance is accompanied by nonzero longitudinal resistance. We numerically investigate this dissipative behavior of QAHE in MTIs with a three-dimensional tight-binding model and non-equilibrium Green's function formalism. It is found that, in clean samples, the geometric mismatch between the detecting electrodes and the MTI sample leads to additional scattering in the central Hall bar, which is similar to the effect of splitting gates in the traditional Hall effect...
September 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#13
Rosa di Mundo, Francesco Bottiglione, Giuseppe Pascazio, Giuseppe Carbone
Hydrophobic and superhydrophobic solid Teflon spheres have been observed while settling in water under the action of gravity, starting from different initial conditions and followed until the steady-state is reached. The superhydrophobic sphere features a nano/microtextured surface and advancing and receding water contact angles of, respectively, 162° and 160°. When impacting water from air, both spheres can entrap a conspicuous amount of air deriving from the sealing of a macro-sized air cavity formed upon impact (air cavity trapping) and standing at the rear part of the settling sphere...
September 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#14
Quantum phase transition occurs at a quantum critical value of a control parameter such as the magnetic field in the Ising model in a transverse magnetic field (ITF). Recently, it is shown that ramping across the quantum critical point generates non-analytic behaviors in the time evolution of a closed quantum system in the thermodynamic limit at zero temperature. The mentioned phenomenon is called the dynamical quantum phase transition (DQPT). Here, we consider the one-dimensional (1D) ITF model with added the Dzyaloshinskii-Moriya interaction (DMI)...
September 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#15
Haiqin Wang, Dadong Yan, Tiezheng Qian
When an evaporating droplet of colloidal suspension dries on a solid surface with the contact&#13; line pinned, the solute particles are driven by the solvent flow toward the edge and form a ring-like&#13; deposition pattern. In this work, we take into account the contact angle hysteresis and incorporate&#13; it into the effective model of Man and Doi [Phys. Rev. Lett. 116, 066101 (2016)] which is based&#13; on Onsager's variational principle. We show that single-ring pattern is formed when the contact&#13; line pinning and/or friction are sufficiently strong...
September 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#16
Sabrina Rufo, Mucio Continentino
\begin{abstract}&#13; In this work, we introduce the Heisenberg Ising-Kondo Necklace with transverse field as a possible model to describe the heavy-fermion compound $URu_{2}Si_{2}$. The physics of this compound presents many open questions, like the transition to the Hidden Order(HO) phase at $T_{0}=17.5K$.&#13; Our Hamiltonian includes elements that come from crystal field processes and Ruderman-Kittel-Kasuya-Yosida(RKKY) interaction.&#13; The main idea is to allow the transverse field, that \emph{a priori} acts only in the localized moments, to influence the conduction-electrons via the RKKY interaction...
September 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#17
Huan Li, Yin Zhong, Yu Liu, Hong-Gang Luo, Hai-Feng Song
Antiferromagnetic topological insulator (AFTI) is a topological matter that breaks time-reversal symmetry. Since its proposal, explorations of AFTI in strong-correlated systems are still lacking. In this paper, we show for the first time that a novel AFTI phase can be realized in three-dimensional topological Kondo insulator (TKI). In a wide parameter region, the ground states of TKI undergo a second-order transition to antiferromagnetic insulating phases which conserve a combined symmetry of time reversal and a lattice translation, allowing us to derive a $\mathcal{Z}_2$-classification formula for these states...
September 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#18
Konstantin Morozov, Elizaveta Girshova, Azat Gubaidullin, Konstantin Ivanov, Galia Pozina, Mikhail Kaliteevski
We demonstrate that disorder in photonic crystals could lead to pronounced modification of spontaneous emission rate in the frequency region corresponding to the photonic band gap (PBG). Depending on the amount of disorder, two different regimes of the Purcell effect occurs. We provide statistical analysis of Purcell coefficient on the frequency of the emitter and its position within the sample. For the moderate disorder, an enhancement of spontaneous emission occurs at the edge of PBG due to the modification of properties of the edge state...
September 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#19
Changyi Wu, Jinchen Han, Lei Sun, Haoran Gong, Chaoping Liang
In the mentioned paper [1], the cohesive energy E (eV/atom) as the function of the c/a in Table 3 should be corrected as follows.
September 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#20
Padmanabhan Balasubramanian, Shalik Ram Joshi, Ruchika Yadav, Frank M F de Groot, Amit Kumar Singh, Avijeet Ray, Mukul Gupta, Ankita Singh, Satyendra Maurya, Suja Elizabeth, Shikha Varma, Tulika Maitra, Vivek K Malik
The electronic structure of double perovskite Pr$_{2}$MnNiO$_{6}$ was studied using core x-ray photoelectron spectroscopy and x-ray absorption spectroscopy.&#13; The $2p$ x-ray absorption spectra show that Mn and Ni are in 2+ and 4+ states respectively. &#13; Based on charge transfer multiplet analysis of the $2p$ XPS spectra of both ions, we find charge transfer energies ${\Delta}$ of 3.5 and 2.5 eV for Ni and Mn respectively. &#13; The ground state of Ni$^{2+}$ and Mn$^{4+}$ ions reveal a higher $d$ electron count of 8...
September 14, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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