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

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https://www.readbyqxmd.com/read/29775186/strong-antisymmetric-spin-orbit-coupling-and-superconducting-properties-the-case-of-noncentrosymmetric-laptsi
#1
Sabrina Palazzese, Javier F Landaeta, Diego Subero, Ernst Bauer, Ismardo Bonalde
In this work we aim to analyze the effect of a strong antisymmetric spin-orbit coupling (ASOC) on superconductivity of noncentrosymmetric LaPtSi. We study the energy gap structure of polycrystalline LaPtSi by using magnetic penetration depth measurements down to 0.02$T_c$. We observed a dirty s-wave behavior, which firmly evidence that the spin-singlet component of the mixed pairing state is highly dominant. This is consistent with previous results in the sense that the mere presence of a strong ASOC does not lead to unconventional behaviors...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29775185/bandgap-and-pseudohelicity-effects-over-conductance-in-gapped-graphene-junctures
#2
Jorge Andres Navarro-Giraldo, Carlos Jose Quimbay
We study the conductance in gapped single-layer graphene junctures as a function of bangap, pseudohelicity and charge carriers density. To do it, we first calculate the transmission coefficients of massive charge carries for p-n and n-p-n junctures of gapped single-layer graphene. Next, we calculate the conductance for these two systems using the Landauer formula. Only for the p-n juncture case and non-zero bandgap values, we find the existence of a contribution to the conductance from pseudohelicity inversion states, which is small compared to the contribution from pseudohelicity conservation states...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29775184/colloidal-transport-through-trap-arrays-controlled-by-active-microswimmers
#3
Wen Yang, Vyacheslav R Misko, Fabio Marchesoni, Franco Nori
We investigate the dynamics of a binary mixture consisting of active and passive colloidal particles diffusing in a two-dimensional
 array of truncated harmonic wells, or traps. We explore the possibility of using a small fraction of active particles to manipulate a much larger fraction of passive particles, for instance, to confine them in or extract them from the traps. The results of our study have potential application in biology and medical sciences, for example, to remove dead cells or undesired contaminants from biological systems by means of self-propelled nano-robots...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29775182/optically-dark-excitonic-states-mediated-exciton-and-biexciton-valley-dynamics-in-monolayer-wse-sub-2-sub
#4
Minghua Zhang, Jiyong Fu, A C Dias, Fanyao Qu
We present a theory to address the photoluminescence (PL) intensity and valley polarization (VP) dynamics in monolayer WSe$_2$, under the impact of excitonic dark states of both excitons and biexcitons. We find that the PL intensity of all excitonic channels including intravalley exciton (X$_{\rm b}$), intravalley biexciton (XX$_{\rm k,k}$) and intervalley biexciton (XX$_{\rm k,k^\prime}$) in particular for the {XX$_{\rm k,k}$} PL is enhanced by laser excitation fluence. In addition, our results indicate the anomalous temperature dependence of PL, i...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29775180/broadband-polarized-emission-from-p-ndi2od-t2-polymer
#5
Steve Ulrich, Tabitha Sutch, Greg Szulczewski, Matthias Schweizer, Newton Barbosa, Paulo Araujo
We investigate the P(NDI2OD-T2) photophysical properties via absorbance and fluorescence spectroscopy, in association with the experimental approach baptized Stokes Spectroscopy, which provides valuable material information through the acquisition and analysis of the fluorescence polarization degree. By changing solvents and using different samples such as solutions, thick, and thin films, it is possible to control the polarization degree spectrum associated to the fluorescence emitted by the polymer's isolated chains and aggregates...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29775179/competing-spin-fluctuations-and-trace-of-vortex-dynamics-in-two-dimensional-triangular-lattice-antiferromagnet-agcrs-sub-2-sub
#6
Wenshuai Gao, Liran Shi, Z W Ouyang, Zheng-Cai Xia, Zhe Wang, Bingjie Liu, Hexuan Li, Youming Zou, Lu Yu, Lei Zhang, Li Pi, Zhe Qu, Yuheng Zhang
The spin dynamics of the two-dimensional triangular-lattice antiferromagnet AgCrS2 is investigated by electron spin resonance (ESR) spectroscopy. The g-factor is found to show an unusual non-monotonously temperature dependent behavior, which, along with the super-Curie behavior observed in the ESR intensity data, provides clear evidences for the competition between FM and AFM fluctuations at temperatures well above TN. On approaching the Néel temperature TN from above, the linewidth is found to diverge. Such a divergent behavior could be well described by the Kawamura-Miyashita model due to Z2 type magnetic vortex-antivortex pairing, which is consistent with the expectation for a 2D Heisenberg magnetic system...
May 18, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29771242/generalisation-of-gilbert-damping-and-magnetic-inertia-parameter-as-a-series-of-higher-order-relativistic-terms
#7
Ritwik Mondal, Marco Berritta, Peter Oppeneer
The phenomenological Landau-Lifshitz-Gilbert (LLG) equation of motion remains as the cornerstone of contemporary magnetisation dynamics studies, wherein the Gilbert damping parameter has been attributed to first-order relativistic effects. To include magnetic inertial effects the LLG equation has previously been extended with a supplemental inertia term and the arising inertial dynamics has been related to second-order relativistic effects. Here we start from the relativistic Dirac equation and, performing a Foldy-Wouthuysen transformation, derive a generalised Pauli spin Hamiltonian that contains relativistic correction terms to any higher order...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29771239/iii-v-heterostructure-tunnel-field-effect-transistor
#8
Clarissa Convertino, Cezar Zota, Heinz Schmid, Adrian M Ionescu, Kirsten Moselund
The Tunnel Field-Effect Transistor (TFET) is regarded as one of the most promising solid-state switches to overcome the power dissipation challenge in ultra-low power integrated circuits. TFETs take advantage of quantum mechanical tunneling hence exploit a different current control mechanism compared to standard MOSFETs. In this review, we describe state-of-the-art development of TFET both in terms of performances and of materials integration and we identify the main remaining technological challenges such as heterojunction defects and oxide/channel interface traps causing trap-assisted-tunneling (TAT)...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29770777/shubnikov-de-haas-oscillations-in-i-p-i-and-i-n-i-type-topological-insulator-bi-sub-x-sub-sb-sub-1-x-sub-sub-2-sub-te-sub-3-sub
#9
Ryota Akiyama, Kazuki Sumida, Satoru Ichinokura, Ryosuke Nakanishi, Akio Kimura, Konstantin A Kokh, Oleg Tereshchenko, Shuji Hasegawa
We show Shubnikov-de Haas (SdH) oscillations in topological insulator (Bi<sub>x</sub>Sb<sub>1-x</sub>)<sub>2</sub>Te<sub>3</sub> flakes whose carrier types are <i>p</i>-type (<i>x</i> = 0.29, 0.34) and <i>n</i>-type (<i>x</i> = 0.42). The physical properties such as the Berry phase, carrier mobility, and scattering time significantly changed by tuning the Fermi-level position with the concentration <i>x</i>...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29770774/i-v-characteristics-of-graphene-nanoribbon-h-bn-heterojunctions-and-resonant-tunneling
#10
Taiga Wakai, Shoichi Sakamoto, Mitsuyoshi Tomiya
We present the first principle calculations of the electrical properties of graphene sheet/h-BN heterojunction(GS/h-BN) and 11-armchair graphene nanoribbon heterojunction(11-AGNR/h-BN), which were carried out using the density functional theory(DFT) method and the non-equilibrium Green's function(NEGF) technique. Since 11-AGNR belongs to the conductive (3n-1)-family of AGNR, both are metallic nanomaterials with two transverse arrays of h-BN, which is a wide-gap semi-conductor. The two h-BN arrays act as double barriers...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29769436/viral-nanomechanics-with-a-virtual-atomic-force-microscope
#11
Maria Aznar, Sergi Roca-Bonet, David Reguera
One of the most important components of a virus is the protein shell or capsid 
 that encloses its genetic material. The main role of the capsid is to protect 
 the viral genome against external aggressions, facilitating its safe and 
 efficient encapsulation and delivery. As a consequence, viral capsids have 
 developed astonishing mechanical properties that are crucial for viral function. 
 These remarkable properties have started to be unveiled in single-virus 
 nanoindentation experiments, and are opening the door to the use of 
 viral-derived artificial nanocages for promising bio- and nano-technological 
 applications...
May 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29767631/finite-temperature-stress-calculations-in-atomic-models-using-moments-of-position
#12
Ranganathan Parthasarathy, Anil Misra, Lizhi Ouyang
Continuum modeling of finite temperature mechanical behavior of atomic systems requires refined description of atomic motions. In this paper, we identify additional kinematical quantities that are relevant for a more accurate continuum description as the system is subjected to step-wise loading. The presented formalism avoids the necessity for atomic trajectory mapping with deformation, provides the definitions of the kinematic variables and their conjugates in real space, and simplifies local work conjugacy...
May 16, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29766906/n-type-rashba-spin-splitting-in-a-bilayer-inorganic-halide-perovskite-with-external-electric-field
#13
Xuejiao Chen, Lei Liu, Dezhen Shen
Here, we investigated the Rashba effect of the CsPbBr<sub>3</sub> bilayers under the external electric eld (EEF), with the first-principles calculations. For the PbBr<sub>2</sub> terminated bilayer, we found that only electrons experience the Rashba splitting under EEF, while holes do not. Such n-type Rashba effect can be ascribed to the surface relaxation effect that reverses the positions of the top valence bands. The n-type Rashba parameter can be tuned monotonically to the maximum of 0...
May 16, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29766905/rapid-freezing-of-water-under-dynamic-compression
#14
Philip C Myint, Jonathan L Belof
Understanding the behavior of materials at extreme pressures is a central issue in fields like aerodynamics, astronomy, and geology, as well as for advancing technological grand challenges such as inertial confinement fusion. Dynamic compression experiments to probe high-pressure states often encounter rapid phase transitions that may cause the materials to behave in unexpected ways, and understanding the kinetics of these phase transitions remains an area of great interest. In this review, we examine experimental and theoretical/computational efforts to study the freezing kinetics of water to a high-pressure solid phase known as ice VII...
May 16, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762140/density-anomaly-of-water-at-negative-pressures-from-first-principles
#15
Andreas Singraber, Tobias Morawietz, Jörg Behler, Christoph Dellago
Using molecular dynamics simulations based on ab initio trained high-dimensional neural network potentials, we study the equation of state of liquid water at negative pressures. From density isobars computed for various pressures down to p = -230 MPa we determine the line of density maxima for two potentials based on the BLYP and the RPBE functionals, respectively. In both cases, dispersion corrections are included to account for non-local long-range correlations that give rise to van der Waals forces. We find that the density maximum persists down to the most negative pressures close to the spinodal instability...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762135/surface-morphology-of-molybdenum-silicide-films-upon-low-energy-ion-beam-sputtering
#16
Raul Gago, Miriam Jaafar, Francisco Javier Palomares Simon
The surface morphology of molybdenum silicide (Mo<sub>x</sub>Si<sub>1-x </sub>) films has been studied after low-energy Ar<sup>+</sup> ion-beam sputtering (IBS) to explore eventual pattern formation on compound targets and, simultaneously, gather information about the mechanisms behind silicide-assisted nanopatterning of silicon surfaces by IBS. For this purpose, Mo<sub>x</sub>Si<sub>1-x </sub> films with compositions below, equal and above the MoSi<sub>2</sub> stoichiometry (x = 0...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762133/evidence-and-evolution-of-magnetic-polaron-in-hgcr-sub-2-sub-se-sub-4-sub-investigated-by-electron-spin-resonance
#17
Lailai Li, Li Qin Yan, You-Guo Shi, Peipei Lu, Young Sun
The evidence and evolution of magnetic polarons (MPs) in HgCr<sub>2</sub>Se<sub>4</sub> have been studied by electron spin resonance (ESR), magnetism and conductivity measurements in a temperature range of 5-300 K. A single paramagnetic resonance line is observed in the high-temperature range while multiple resonance lines appear in the low-temperature range. As temperature decreases, the peak-to-peak linewidth ΔHpp shows a minimum at Tmin ≈ 210 K, with the activation energy fitted by small polaron hopping model consistent with the bottleneck mechanism, providing an evidence for existence of small MPs above Tmin...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762131/two-dimensional-self-assembly-zinc-porphyrins-and-zinc-phthalocyanines-heterojunctions-with-record-high-power-conversion-efficiencies
#18
Junting Yu, Zhou Jiang, Yifan Hao, Qianhong Zhu, Mingliang Zhao, Xue Jiang, Jijun Zhao
Compared to inorganic solar cells, the power conversion efficiencies (PCEs) of organic solar cells are much lower, but they are compensated by many merits such as lower cost, less weight, and tunable structures, making them prospective for further applications. Porphyrin and phthalocyanine are the two most significant materials for organic solar cells due to their strong light-absorbing properties and semiconductor characteristics. However, there is little research on the 2D heterojunction solar cells based on these two materials, meanwhile the PCEs of them are still low...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762129/low-bias-negative-differential-resistance-in-junction-of-a-benzene-between-zigzag-edged-phosphorene-nanoribbons
#19
Jia Chun-Xia, Liemao Cao, Xiaoying Zhou, Benliang Zhou, Guanghui Zhou
We study the electron transport properties through the junction of a
 benzene molecule in conjunction with two monolayer zigzag-edged
 phosphorene (ZPNR) electrodes by applying the nonequilibrium Green's
 functions in combination with the density functional theory. We find
 that the molecular junction with two phosphorus-carbon bonds
 exhibits an interesting low-bias negative differential resistance
 effect with a peak-to-valley ratio of 29, which is original from the
 edge states in ZPNR due to the anisotropic band structure of
 phosphorene...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29762128/collective-excitations-in-weyl-semimetals-in-the-hydrodynamic-regime
#20
Pavlo O Sukhachov, E V Gorbar, Igor A Shovkovy, V A Miransky
The spectrum of collective excitations in Weyl materials is studied by using a consistent hydrodynamics. The corresponding framework includes the vortical and chiral anomaly effects, as well as the dependence on the separations between the Weyl nodes in energy b<sub>0</sub> and momentum <b>b</b>. The latter are introduced via the Chern--Simons contributions to the electric current and charge densities in Maxwell's equations. It is found that, even in the absence of a background magnetic field, certain collective excitations (e...
May 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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