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Showing 2007Show all

195 papers · 1 filter

cond-mat.str-el2007★ 14 cited

Superfluidity of two- dimensional excitons in flat and harmonic traps

Yu. E. Lozovik, I. L. Kurbakov, M. Willander

Superfluid exciton density and superfluid transition (crossover) temperature are calculated for 2D excitons in large-size flat and harmonic traps. A generalized local density appro…

cond-mat.str-el2007★ 36 cited

Effects of strong correlations for 2D Bose-Einstein condensed dipolar excitons

Yu. E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik +2

By doing quantum Monte Carlo ab initio simulations we show that dipolar excitons, which are now under experimental study, actually are strongly correlated systems. Strong correlati…

astro-ph2007★ 7 cited

Cosmology of Vacuum

V. Burdyuzha, G. Vereshkov

Shortly the vacuum component of the Universe from the geometry point of view and from the point of view of the standard model of physics of elementary particles is discussed. Some…

physics.ins-det2007★ 36 cited

Detectors and flux instrumentation for future neutrino facilities

T. Abe, H. Aihara, C. Andreopoulos +66

This report summarises the conclusions from the detector group of the International Scoping Study of a future Neutrino Factory and Super-Beam neutrino facility. The baseline detect…

physics.ao-ph2007

Effect of Multiple Scattering on the Critical Electric Field for Runaway Electrons in the Atmosphere

Ya. S. Elensky

A simple method for taking into account the multiple Coulomb scattering in construction of a separatrix (the line separating the regions of runaway and decelerating electrons in an…

cond-mat.other2007★ 26 cited

Plasmonic nature of van der Waals forces between nanoparticles

V. V. Klimov, A. Lambrecht

We propose a new approach to calculate van der Waals forces between nanoparticles where the van der Waals energy can be reduced to the energy of elementary surface plasmon oscillat…

nlin.CD2007★ 11 cited

Unstable periodic orbits in a chaotic meandering jet flow

M. Yu. Uleysky, M. V. Budyansky, S. V. Prants

We study the origin and bifurcations of typical classes of unstable periodic orbits in a jet flow that was introduced before as a kinematic model of chaotic advection, transport an…

cond-mat.mes-hall2007★ 81 cited

Electric field effect on electron spin splitting in SiGe/Si quantum wells

M. O. Nestoklon, E. L. Ivchenko, J. -M. Jancu +1

Effect of electric field on spin splitting in SiGe quantum wells (QWs) has been studied theoretically. Microscopical calculations of valley and spin splittings are performed in the…

astro-ph2007★ 18 cited

The discovery of high-amplitude 10.9-minute oscillations in the cool magnetic Ap star HD 115226

O. Kochukhov, T. Ryabchikova, S. Bagnulo +1

We present the discovery of pulsational variations in the cool magnetic Ap star HD 115226 -- the first high-amplitude rapidly oscillating Ap star discovered with time-series spectr…

cond-mat.other2007★ 28 cited

Direct evidence of overdamped Peierls-coupled modes in TTF-CA temperature-induced phase transition

A. Girlando, M. Masino, A. Painelli +5

In this paper we elucidate the optical response resulting from the interplay of charge distribution (ionicity) and Peierls instability (dimerization) in the neutral-ionic, ferroele…

math.GR2007★ 3 cited

Orbit decidability and the conjugacy problem for some extensions of groups

O. Bogopolski, A. Martino, E. Ventura

Given a short exact sequence of groups with certain conditions, , we prove that has solvable conjugacy problem if and only if the corresponding action su…

cond-mat.str-el2007★ 40 cited

Magnetic properties of HO2 thin films

Nicolas Hadacek, Alexandre Nossov, Laurent Ranno +2

We report on the magnetic and transport studies of hafnium oxide thin films grown by pulsed-laser deposition on sapphire substrates under different oxygen pressures, ranging from 1…

cond-mat.mes-hall2007★ 63 cited

Symmetry and spin dephasing in (110)-grown quantum wells

V. V. Bel'kov, P. Olbrich, S. A. Tarasenko +7

Symmetry and spin dephasing of in (110)-grown GaAs quantum wells (QWs) are investigated applying magnetic field induced photogalvanic effect (MPGE) and time-resolved Kerr rotation.…

math-ph2007★ 51 cited

Emptiness formation probability in the domain-wall six-vertex model

F. Colomo, A. G. Pronko

The emptiness formation probability in the six-vertex model with domain wall boundary conditions is considered. This correlation function allows one to address the problem of limit…

cond-mat.supr-con2007★ 9 cited

Non-local electron transport and cross-resistance peak in NSN heterostructures

Mikhail S. Kalenkov, Andrei D. Zaikin

We develop a microscopic theory describing the peak in the temperature dependence of the non-local resistance of three-terminal NSN devices. This peak emerges at sufficiently high…

astro-ph2007★ 4 cited

Stellar Subsystems of the Galaxy NGC 2366

N. A. Tikhonov, O. A. Galazutdinova

Hubble Space Telescope archive data are used to perform photometry of stars in seven fields at the center and periphery of the galaxy NGC2366. The variation of the number density o…

astro-ph2007★ 15 cited

Possible optical detection of a fast, nearby radio pulsar PSR B1133+16

S. V. Zharikov, Yu. A. Shibanov, R. E. Mennickent +1

Aims: We performed deep optical observations of the field of an old, fast-moving radio pulsar PSR B1133+16 in an attempt to detect its optical counterpart and a bow shock nebula. M…

cond-mat.mes-hall2007★ 7 cited

Magnetotransport in low-density -Si/SiGe heterostructures: From metal through hopping insulator to Wigner glass

I. L. Drichko, A. M. Dyakonov, I. Yu. Smirnov +6

We study DC and AC transport in low-density Si/SiGe heterostructures at low temperatures and in a broad domain of magnetic fields up to 18 T. Complex AC conductance is determin…

astro-ph2007★ 57 cited

The infrared JHK light curves of RR Lyr

A. Sollima, C. Cacciari, A. A. Arkharov +4

We present infrared JHK time series photometry of the variable star RR Lyr, that allow us to construct the first complete and accurate infrared light curves for this star. The deri…

gr-qc2007★ 15 cited

Kerr-Gauss-Bonnet Black Holes: An Analytical Approximation

S. Alexeyev, N. Popov, M. Startseva +2

Gauss-Bonnet gravity provides one of the most promising frameworks to study curvature corrections to the Einstein action in supersymmetric string theories, while avoiding ghosts an…

astro-ph2007★ 354 cited

The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows

D. A. Kann, S. Klose, B. Zhang +73

We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for a total of 76…

astro-ph2007★ 70 cited

Ultra-High Energy Cosmic Ray production in the polar cap regions of black hole magnetospheres

A. Neronov, D. Semikoz, I. Tkachev

We develop a model of ultra-high energy cosmic ray (UHECR) production via acceleration in a rotation-induced electric field in vacuum gaps in the magnetospheres of supermassive bla…

astro-ph2007★ 26 cited

Understanding the WMAP Cold Spot mystery

Pavel D. Naselsky, Per Rex Christensen, Peter Coles +3

The first and third year data releases from the WMAP provide evidence of an anomalous Cold Spot (CS) at galactic latitude b=-57deg and longitude l=209deg. We have examined the prop…

astro-ph2007★ 3 cited

Dark Electric Matter Objects: History of Discovery, Modes of Interaction with Matter, Some Inferences and Prospects

E. M. Drobyshevski, M. E. Drobyshevski

Experiments with thin ZnS(Ag) scintillators provide evidence with C.L. > 99.99% for the existence of DArk Electric Matter Objects - daemons (presumably negatively charged Planckian…