journal

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

journal
#1
L Dudy, J Aulbach, T Wagner, J Schäfer, R Claessen
Interacting electrons confined to only one spatial dimension display a wide range of unusual many-body quantum phenomena, ranging from Peierls instabilities to the breakdown of the canonical Fermi liquid paradigm to even unusual spin phenomena. The underlying physics is not only of tremendous fundamental interest, but may also have bearing on device functionality in future micro- and nanoelectronics with lateral extensions reaching the atomic limit. Metallic adatoms deposited on semiconductor surfaces may form self-assembled atomic nanowires, thus representing highly interesting and well-controlled solid-state realizations of such 1D quantum systems...
September 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#2
Stephen M Winter, Alexander A Tsirlin, Maria Daghofer, Jeroen van den Brink, Yogesh Singh, Philipp Gegenwart, Roser Valenti
The exactly solvable Kitaev model on the honeycomb lattice has recently received enormous attention linked to the hope of achieving novel spin-liquid states with fractionalized Majorana-like excitations. In this review, we analyze the mechanism proposed by G. Jackeli and G. Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions and provide a comprehensive overview of its implications in real materials. We set the focus on experimental results and current theoretical understanding of planar honeycomb systems (Na2IrO3, γ-Li2IrO3, and α-RuCl3), three-dimensional Kitaev materials (β- and γ-Li2IrO3), and other potential candidates, completing the review with the list of open questions awaiting new insights...
September 15, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#3
Jianping Sun, Yuanyuan Jiao, Chongli Yang, Wei Wu, Changjiang Yi, Bosen Wang, You Guo Shi, Jian Lin Luo, Yoshiya Uwatoko, Jinguang Cheng
K2Cr3As3 is a newly discovered quasi-one-dimensional superconductor with a Tc = 6.1 K and an upper critical field μ0Hc2(0) ~ 40 T three times larger than the Pauli paramagnetic limit μ0Hp that is suggestive of a spin-triplet Cooper pairing. In this paper, we have investigated the effects of hydrostatic pressure on its Tc and μ0Hc2 by measuring the ac magnetic susceptibility χ(T) under magnetic fields at various hydrostatic pressures up to 7.5 GPa. The major findings include: (1) Tc is suppressed gradually to below 2 K at 7...
September 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#4
Yu-Xi Song, Wen-Yi Tong, Yu-Hao Shen, Shijing Gong, Z Tang, Chun-Gang Duan
Considerable progress in contemporary spintronics has been made in recent years for developing nanoscale data memory and quantum information processing. It is, however, still a great challenge to achieve the ultimate limit of storage bit. Two-dimensional materials, fortunately, provide an alternative solution to design materials with the expected miniaturizing scale, the chemical stability as well as the giant magnetic anisotropy energy. By performing first-principles calculations, we have examined two possible doping sites on WS<sub>2</sub> monolayer using three kind of transition metal (TM) atoms (Mn, Fe and Co)...
September 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#5
Ya-Jie Wu, Ning Li, Jing He, Su-Peng Kou
In this paper, we present a study on the repulsive Haldane-Hubbard model with spin-rotation symmetry in square lattices by deriving non-linear $\sigma$ model for magnetic states. It is found that a chiral spin liquid state as the ground state of the correlated system exists in the $\mathcal{C}=2$ topological spin-density wave proposed by Y.-J. Wu \textit{et al.} [J. Phys.: Condens. Matter \textbf{28}, 115602 (2016)], of which the low energy physics can be determined by the Chern-Simons-Hopf gauge field theory...
September 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#6
Xue-Kun Chen, Jun Liu, Dan Du, Ke-Qiu Chen
The thermal transport properties of graphyne are investigated via equilibrium molecular dynamics (EMD) simulations and non-equilibrium Green's function (NEGF) method. It is found that the room-temperature thermal conductivity of graphyne is very low compared to that of graphene with a similar size and decreases steeply with increasing the number of acetylenic linkages, which agrees with the results obtained by NEGF method qualitatively. Lattice dynamics calculations reveal that these phenomena can be attributed to the remarkable reduction of both phonon group velocities and phonon lifetimes in graphyne at low-frequency region...
September 13, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#7
Andreas Härtel
Ongoing scientific interest is aimed at the properties and structure of electric double layers (EDLs), which are crucial for capacitive energy storage, water treatment, and energy harvesting technologies like supercapacitors, desalination devices, blue engines, and thermocapacitive heat-to-current converters. A promising tool to describe their physics on a microscopic level is (classical) density functional theory (DFT), which can be applied in order to analyze pair correlations and charge ordering in the primitive model of charged hard spheres...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#8
Suman Raj Panday, Benjamin M Fregoso
The two-dimensional ferroelectrics GeS, GeSe, SnS and SnSe are expected to have large spontaneous in-plane electric polarization and enhanced shift-current response. Using density functional methods, we show that these materials also exhibit the largest effective second harmonic generation reported so far. It can reach magnitudes up to 10 nm/V which is about an order of magnitude larger than that of prototypical GaAs. To rationalize this result we model the optical response with a simple one-dimensional two-band model along the spontaneous polarization direction...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#9
Filip Strubbe, Kristiaan Neyts
Charged inverse micelles play an important role in the electrical charging and the electrodynamics of nonpolar colloidal dispersion relevant for applications such as electronic ink displays and liquid toner printing. This review examines the properties and the behavior of charged inverse micelles in microscale devices in the absence of colloidal particles. It is discussed how charge in nonpolar liquids is stabilized in inverse micelles and how conductivity depends on the inverse micelle size, water content and ionic impurities...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#10
Maxim Shishkin, Hirofumi Sato
submitted as Erratum.
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#11
Osamu Takayama, Andrey Bogdanov, Andrei V Lavrinenko
A surface wave (SW) in optics is a light wave, which is supported at an interface of two dissimilar media and propagates along the interface with its field amplitude exponentially decaying away from the boundary. The research on surface waves has been flourishing in last few decades thanks to their unique properties of surface sensitivity and field localization. These features have resulted in applications in nano-guiding, sensing, light-trapping and imaging based on the near-field techniques, contributing to the establishment of the nanophotonics as a field of research...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#12
Vasilii S Zakhvalinskii, Tatyana Nikulicheva, Erkki Lähderanta, Mikhail A Shakhov, Ekaterina Nikitovskaya, Sergey Taran
Shubnikov-de Haas (SdH) effect and magnetoresistance measurements of single crystals of diluted II-V magnetic semiconductors (Cd<sub>1-x-y</sub>Zn<sub>x</sub>Mn<sub>y</sub>)<sub>3</sub>As<sub>2</sub> (x + y = 0.4, y = 0.04 and 0.08) are investigated in the temperature range T = 4.2 ÷ 300 K and in transverse magnetic field B = 0 ÷ 25 T. The values of the cyclotron mass m<sub>c</sub>, the effective g-factor g*, and the Dingle temperature T<sub>D</sub> are defined...
September 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#13
Lalla Btissam Drissi, Fatima Zahra Ramadan, Samir Lounis
The optical excitation spectra and excitonic resonances are investigated in systematically functionalized SiC with Fluorine and/or Chlorine utilizing density functional theory in combination with many-body perturbation theory. The latter is required for a realistic description of the energy band-gaps as well as for the theoretical realization of excitons. Structural, electronic and optical properties are scrutinized and show the high stability of the predicted two-dimensional materials. Their realization in laboratory is thus possible...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#14
We presented detailed frequency and temperature dependent dielectric response in Eu1-xBaxTiO3 (0 < x < 0.5). Excluding grain boundary effects, four relaxation mechanisms have been observed. Relaxation dynamics were observed to arise due to hopping conduction associated with defects namely, oxygen vacancies, Eu3+ and Ti3+ ions. Dielectric relaxation analysis led to identification of Ti ions in two different environments with different relaxation rates in the overall EuTiO3 perovskite structure. Emergence of another relaxation mechanism associated with ferroelectric order as a consequence of formation of polar regions have also been observed for higher Ba concentrations...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#15
Samuel Booth, Alok Mani Tripathi, Ilya Strashnov, Robert Angus William Dryfe, Alex Walton
The routine study of the solid-water interface by XPS is potentially revolutionary as this development opens up whole new areas of study for photoelectron spectroscopy. To date this has been realised by only a few groups worldwide and current techniques have significant restrictions on the type of samples which can be studied. Here we present a novel and uniquely flexible approach to the problem. By introducing a thin capillary into the NAP-XPS, a small droplet can be injected onto the sample surface, offset from the analysis area by several mm...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#16
H Yamaoka, Patrik Thunström, Naohito Tsujii, Kenichi Katoh, Yoshiya Yamamoto, Eike F Schwier, Kenya Shimada, Hideaki Iwasawa, Masashi Arita, Ignace Jarrige, Nozomu Hiraoka, Hirofumi Ishii, K D Tsuei, Jun'ichiro MIzuki
Electronic structures of ferromagnetic heavy fermion Yb compounds of YbPdSi, YbPdGe, and YbPtGe are studied by photoelectron spectroscopy around the Yb 4<u>d</u>-4<i>f</i> resonance, resonant x-ray emission spectroscopy at the Yb <i>L</i><sub>3</sub> absorption edge, and density functional theory combined with dynamical mean field theory calculations. These compounds are all having a temperature independent intermediate Yb valence with large Y<sup>b3+</sup> and small Yb<sup>2+</sup> components...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#17
Hybrid functionals' non-local exchange-correlation potential contains a derivative discontinuity that improves on standard semi-local density functional theory (DFT) band gaps. Moreover, by careful parameterization, hybrid functionals can provide self-interaction reduced description of selected states. On the other hand, the uniform description of all the electronic states of a given system is a known drawback of these functionals that causes varying accuracy in the description of states with different degrees of localization...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#18
Marit Kjærvik, Anja Hermanns, Paul Dietrich, Andreas Thissen, Stephan Bahr, Benjamin Ritter, Erhard Kemnitz, Wolfgang Unger
Two systems of suspended nanoparticles have been studied with near-ambient pressure XPS: silver nanoparticles in water and strontium fluoride - calcium fluoride core-shell nanoparticles in ethylene glycol. The corresponding dry samples were measured under ultra high vacuum for comparison. The results obtained under near-ambient pressure were overall comparable to those obtained under ultra high vacuum, although measuring silver nanoparticles in water requires a high pass energy and a long acquisition time. A shift towards higher binding energies was found for the silver nanoparticles in aqueous suspension compared to the corresponding dry sample, which can be assigned to a change of surface potential at the water-nanoparticle interface...
September 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#19
Thierry Grenet, Julien Delahaye
Insulating granular aluminum is one of the proto-typical disordered insulators whose low temperature electrical conductance exhibits ubiquitous non-equilibrium phenomena. These include slow responses to temperature or gate voltage changes, characteristic field effect anomalies and ageing phenomena typical of a glass. In this system the influence of temperature on the glassy dynamics has remained elusive, leading to the belief that the slow relaxations essentially proceed via elastic quantum tunneling. A similar situation was met in insulating indium oxide and it was concluded that in high carrier density Anderson insulators, electrons form a quantum glass phase...
September 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
#20
Carl Wesslen, Eva Lindroth
Spin-orbit mediated phonon relaxation in a two-dimensional quantum dot is investigated using different confining potentials. Elliptical harmonic oscillator and cylindrical well results are compared to each other in the case of a two-electron GaAs quantum dot subjected to a tilted magnetic field. The lowest energy set of two-body singlet and triplet states are calculated including spin-orbit and magnetic effects. These are used to calculate the phonon induced transition rate from the excited triplet to the ground state singlet for magnetic fields up to where the states cross...
September 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
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