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Condensed Matter papers — page 217

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Level broadening effects in quantum kinetic equations: Hot luminescence from a quantum wire near the optical phonon emission threshold
A recipe for the generalization of the Boltzmann equation to a quantum kinetic equation is given for cases in which only level shift and broadening are considered, while coherence phenomena can be…
Michal Rokni, Y. LevinsonFeb 12, 1997
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Singularites at a Dense Set of Temperature in Husimi Tree
We investigate complex temperature singularities of the three-site interacting Ising model on the Husimi tree in the presentce of magnetic field. We show that at certain magnetic field these…
A. E. Alahverdian, N. S. Ananikian, S. K. DallakianFeb 12, 1997
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Thermodynamic Properties of 1d Heisenberg Model. Magnetic Moment of Spinon
The one dimensional spin 1/2 Heisenberg antiferromagnet is considered using a simple quasiparticle picture - an interacting Fermi gas of kinks. Using this picture the low temperature heat capacity,…
W. McRae, O. SushkovFeb 12, 1997
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Contact Injection into Polymer Light-Emitting Diodes
The variation of current I with voltage V for poly(phenylene vinylene) and other polymer light-emitting diodes has been attributed to carriers tunneling into broad conduction and valence bands. In…
E. M. Conwell, M. W. WuFeb 11, 1997
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Density Functional Theory of Epitaxial Growth of Metals
This chapter starts with a summary of the atomistic processes that occur during epitaxy. We then introduce density functional theory (DFT) and describe its implementation into state-of-the-art…
P. Ruggerone, C. Ratsch, M. SchefflerFeb 11, 1997
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Self-Organized Criticality Driven by Deterministic Rules
We have investigated the essential ingredients allowing a system to show Self Organized Criticality (SOC) in its collective behavior. Using the Bak-Sneppen model of biological evolution as our…
Paolo De Los Rios, Angelo Valleriani, José Luis VegaFeb 7, 1997
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Motion of Vacancies in a Pinned Vortex Lattice: Origin of the Hall Anomaly
Physical arguments are presented to show that the Hall anomaly is an effect of the vortex many-body correlation rather than that of an individual vortex. Quantitatively, the characteristic energy…
P. AoFeb 6, 1997
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C-axis Transport in Bilayer Cuprates and Relation to Pseudogap
We consider the effect of interband transitions on the c-axis conductivity, DC resistivity, and thermal conductivity in a plane-chain bilayer model of a cuprate. The relation between the c-axis…
W. C. Wu, W. A. Atkinson, J. P. CarbotteFeb 6, 1997
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Boltzmann Collision Kernels and Velocity Saturation in Semiconductors
For different models of the electron-phonon interaction, the asymptotic behaviour of the moments of the stationary homogeneous solution of the linear Boltzmann equation is determined in the limit of…
C. DalitzFeb 6, 1997
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Aging in a Model of Self-Organized Criticality
Temporal autocorrelation functions for avalanches in the Bak-Sneppen model display aging behavior similar to glassy systems. Numerical simulations show that they decay as power laws with two distinct…
Stefan Boettcher, Maya PaczuskiFeb 5, 1997
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The 2-Channel Kondo Model II: CFT Calculation of Non-Equilibrium Conductance through a Nanoconstriction containing 2-Channel Kondo Impurities
Recent experiments by Ralph and Buhrman on zero-bias anomalies in quenched Cu nanoconstrictions (reviewed in the preceding paper, I), are in accord with the assumption that the interaction between…
Jan von Delft, A. W. W. Ludwig, Vinay AmbegaokarFeb 5, 1997
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The 2-Channel Kondo Model I: Review of Experimental Evidence for its Realization in Metal Nanoconstrictions
Certain zero-bias anomalies (ZBAs) in the voltage, temperature and magnetic field dependence of the conductance G(V,T,H) of quenched Cu point contacts have previously been interpreted to be due to…
Jan von Delft, D. C. Ralph, R. A. Buhrman et al.Feb 5, 1997
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Effective one-band electron-phonon Hamiltonian for nickel perovskites
Inspired by recent experiments on the Sr-doped nickelates, La2-xSrxNiO4, we propose a minimal microscopic model capable to describe the variety of the observed quasi-static charge/lattice…
J. Loos, H. FehskeFeb 5, 1997
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Phase diagrams of the S=1/2 quantum antiferromagnetic XY model on the triangular lattice in magnetic fields
We study the S=1/2 quantum antiferromagnetic XY model on finite triangular lattices with N sites in both longitudinal and transverse magnetic fields. We calculate physical quantities in the ground…
Nobuo Suzuki, Fumitaka MatsubaraFeb 5, 1997
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Steering and ro-vibrational effects in the dissociative adsorption and associative desorption of H2/Pd(100)
The interaction of hydrogen with many transition metal surfaces is characterized by a coexistence of activated with non-activated paths to adsorption with a broad distribution of barrier heights. By…
Axel Gross, Matthias SchefflerFeb 4, 1997
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Dynamics of Selfavoiding Tethered Membranes I Model A Dynamics (Rouse Model)
The dynamical scaling properties of selfavoiding polymerized membranes with internal dimension D are studied using model A dynamics. It is shown that the theory is renormalizable to all orders in…
Kay Joerg WieseFeb 3, 1997
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Critical properties of 1-D spin 1/2 antiferromagnetic Heisenberg model
We discuss numerical results for the 1-D spin 1/2 antiferromagnetic Heisenberg model with next-to-nearest neighbour coupling and in the presence of an uniform magnetic field. The model develops zero…
J. F. Audet, A. Fledderjohann, C. Gerhardt et al.Feb 3, 1997
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Dynamics of Selfavoiding Tethered Membranes II, Inclusion of Hydrodynamic Interaction (Zimm Model)
The dynamical scaling properties of selfavoiding polymerized membranes with internal dimension D embedded into d dimensions are studied including hydrodynamical interactions. It is shown that the…
Kay Joerg WieseFeb 3, 1997
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Spinodal decomposition to a lamellar phase: effects of hydrodynamic flow
Results are presented for the kinetics of domain growth of a two-dimensional fluid quenched from a disordered to a lamellar phase. At early times when a Lifshitz-Slyozov mechanism is operative the…
G. Gonnella, E. Orlandini, J. M. YeomansFeb 3, 1997
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Long-Tailed Trapping Times and Levy Flights in a Self-Organized Critical Granular System
We present a continuous time random walk model for the scale-invariant transport found in a self-organized critical rice pile [Christensen et al., Phys. Rev. Lett. 77, 107 (1996)]. From our…
Marian Boguna, Alvaro CorralFeb 2, 1997
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Hole Photoproduction in Insulating Copper Oxide
To explain the experimental spectra for angle resolved photoemission we consider a modified t-J model. The modified model includes next nearest (t') and next next nearest (t'') hopping as…
O. Sushkov, G. Sawatzky, R. Eder et al.Jan 31, 1997
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Anisotropic Transport of Quantum Hall Meron-Pair Excitations
Double-layer quantum Hall systems at total filling factor νT=1 can exhibit a commensurate-incommensurate phase transition driven by a magnetic field B oriented parallel to the…
Kyungsun Moon, Kieran MullenJan 30, 1997
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On representation of the t-J model via spin-charge variables
We show that the t-J Hamiltonian is not in general reduced to H(S,f), where S and f stand for independent ([S,f]=0) SU(2) (spin) generators and spinless fermionic (hole) field, respectively. The…
Evgueni Kochetov, Vladimir YaruninJan 30, 1997
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Randomness and Apparent Fractality
We show that when the standard techniques for calculating fractal dimensions in empirical data (such as the box counting) are applied on uniformly random structures, apparent fractal behavior is…
D. A. Lidar, O. Malcai, O. Biham et al.Jan 28, 1997
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Two-Body Correlations and the Underlying Phase Transitions in Bilayers
The pair correlation functions for a bilayer system of classical electrons has been calculated through a two-component HNC formalism. The results show changes in the structure of the correlation…
V. I. Valtchinov, G. Kalman, K. BlagoevJan 27, 1997
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