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Condensed Matter papers — page 33

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Born Effective Charges and Infrared Response of LiBC
Calculations of the zone center optical mode frequencies (including LO-TO splitting), Born effective charges Z*αα for each atom, dielectric constants ε0 and ε∞, and the…
Kwan-Woo Lee, W. E. PickettFeb 24, 2003
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Spin-Polarized Electron Transport at Ferromagnet/Semiconductor Schottky Contacts
We theoretically investigate electron spin injection and spin-polarization sensitive current detection at Schottky contacts between a ferromagnetic metal and an n-type or p-type semiconductor. We use…
J. D. Albrecht, D. L. SmithFeb 24, 2003
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The dynamics of quantum phases in a spinor condensate
We discuss the quantum phases and their diffusion dynamics in a spinor-1 atomic Bose-Einstein condensate. For ferromagnetic interactions, we obtain the exact ground state distribution of the phases…
S. Yi, Ö. E. Müstecaplıoğlu, L. YouFeb 22, 2003
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High Temperature Superfluid and Feshbach Resonance
We study an effective field theory describing cold fermionic atoms near a Feshbach resonance. The theory gives a unique description of the dynamics in the limit that the energy of the Feshbach…
Deog Ki Hong, Stephen D. H. HsuFeb 21, 2003
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On the weak nematic elasticity
The paper considers the general case of incompressible non-classical elasticity with small deformations and rotations. The thermodynamic stability is analysed for free energy density with three…
A. I. Leonov, V. S. VolkovFeb 21, 2003
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A Numerical Study of Evanescent Fields in Backward-Wave Slabs
Numerical study of evanescent fields in an isotropic backward-wave (BW) (double negative or "left-handed") slab is performed with the FDTD method. This system is expected to be able to…
M. K. Karkkainen, S. A. Tretyakov, S. I. Maslovski et al.Feb 20, 2003
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Theory of excited state absorptions in phenylene-based π-conjugated polymers
Within a rigid-band correlated electron model for oligomers of poly-(paraphenylene) (PPP) and poly-(paraphenylenevinylene) (PPV), we show that there exist two fundamentally different classes of…
Alok Shukla, Haranath Ghosh, S. MazumdarFeb 20, 2003
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Dynamical Nuclear Polarization by Electrical Spin Injection in Ferromagnet-Semiconductor Heterostructures
Electrical spin injection from Fe into AlxGa1-xAs quantum well heterostructures is demonstrated in small (< 500 Oe) in-plane magnetic fields. The measurement is sensitive only to the…
J. Strand, B. D. Schultz, A. F. Isakovic et al.Feb 20, 2003
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The c-axis optical sum rule and possible new collective mode in LSCO
We present the c-axis optical conductivity σ1c(ω, T) of underdoped (x = 0.12) and optimally doped (x = 0.15) LSCO from 4 meV to 1.8 eV obtained by a combination of reflectivity and…
A. B. Kuzmenko, N. Tombros, H. J. A. Molegraaf et al.Feb 19, 2003
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Experimental study of high frequency stochastic resonance in Chua circuits
We study the stochastic resonance phenomenon occurring in electronic Chua circuits operating in the chaotic regime when the forcing signal is modulated at relatively high frequency, of the order of…
I. Gomes, C. Mirasso, R. Toral et al.Feb 19, 2003
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Numerical Modelling of Transport Processes in Semiconductors
The peculiarities of electric current in semiconductors with nonuniform distribution of charge carriers are studied. The semiclassical drift-diffusion equations consisting of the continuity equations…
E. P. Yukalova, V. I. YukalovFeb 18, 2003
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A Unified Algebraic Approach to Few and Many-Body Correlated Systems
The present article is an extended version of the paper Phys. Rev. B 59, R2490 (1999), where, we have established the equivalence of the Calogero-Sutherland model to decoupled…
N. Gurappa, Prasanta K. PanigrahiFeb 18, 2003
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Condensate Heating by Atomic Losses
Atomic Bose-Einstein condensate is heated by atomic losses. Predicted depletion ranges from 1% for a uniform 3D condensate to around 10% for a quasi-1D condensate in a harmonic trap.
Jacek Dziarmaga, Krzysztof SachaFeb 18, 2003
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Reply to ``Comment on `Tunnel Window's Imprint on Dipolar Field Distributions' ''
Stamp and Tupitsyn (ST) have recently posted a Comment (P.C.E. Stamp and I.S. Tupitsyn, arXiv:cond-mat/0211413) on a Letter of ours (J.J. Alonso and J.F. Fernandez, Phys. Rev. Lett. v87, 097205…
Juan J. Alonso, Julio F. FernandezFeb 17, 2003
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High temperature spin dephasing in n-typed GaAs quantum wells
We perform a many-body study of the spin dephasing due to the D'yakonov-Perel' effect in n-typed GaAs (100) quantum wells for high temperatures (≥ 120 K) under moderate magnetic fields…
M. Q. Weng, M. W. WuFeb 17, 2003
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The Functional Renormalization Group Treatment of Disordered Systems: a Review
We review current progress in the functional renormalization group treatment of disordered systems. After an elementary introduction into the phenomenology, we show why in the context of disordered…
Kay Joerg WieseFeb 17, 2003
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On properties of elementary excitations in fractal media
It is shown that elementary excitations in fractal media obey the so-called parastatistics of a variable order. We show that the order of the parastatistics N(k) is a function of wave numbers k…
A. A. KirillovFeb 17, 2003
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Recursiveness, Switching, and Fluctuations in a Replicating Catalytic Network
A protocell model consisting of mutually catalyzing molecules is studied in order to investigate how chemical compositions are transferred recursively through cell divisions under replication errors.…
Kunihiko KanekoFeb 15, 2003
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Numerical Study of Wave Propagation in Uniaxially Anisotropic Lorentzian Backward Wave Slabs
The propagation and refraction of a cylindrical wave created by a line current through a slab of backward wave medium, also called left-handed medium, is numerically studied with FDTD. The slab is…
M. K. KarkkainenFeb 14, 2003
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Self-Similar Extrapolation for the Law of Acoustic Emission Before Failure of Heterogeneous Materials
Acoustic emission before the failure of heterogeneous materials is studied as a function of applied hydrostatic pressure. A formula for the energy release is suggested, which is valid in the whole…
A. Moura, V. I. YukalovFeb 13, 2003
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Magnon and phonon assisted tunneling in a high-magnetoresistance tunnel junction using Co75Fe25 ferromagnetic electrodes
Magnetoelectric properties of the spin-valve-type tunnel junction of Ta(5\ nm)/Ni79Fe21 (25 nm)/Ir22Mn78 (10 nm)/Co75Fe25 (4 nm)/Al (0.8 nm)-oxide/Co75Fe25 (4…
C. Lü, M. W. Wu, X. F. HanFeb 12, 2003
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Are Scale Free Networks Better?
We study the performance of Weibull and scale free Internet-like networks and compare them to a classical random graph based network. The scaling of the traffic load with the nodal degree is…
Gergely Peli, Gabor PappFeb 11, 2003
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Kohn-Sham equations for nanowires with direct current
The paper describes the derivation of the Kohn-Sham equations for a nanowire with direct current. A value of the electron current enters the problem as an input via a subsidiary condition imposed by…
D. S. KosovFeb 10, 2003
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Bouncing gel balls: impact of soft gels onto rigid surface
After thrown onto a solid substrate, very soft spherical gels bounce repeatedly. Separate rheological measurements suggest that these balls can be treated as nearly elastic. The Hertz contact…
Yoshimi Tanaka, Yoshihiro Yamazaki, Ko OkumuraFeb 9, 2003
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Excitonic instability in two-dimensional degenerate semimetals
We study the possibility of excitonic pairing in layered degenerate semimetals such as graphite, where the electron density of states almost vanishes at the Fermi level and, therefore, the Coulomb…
H. Leal, D. V. KhveshchenkoFeb 9, 2003
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