Quantum Phase Interference for Quantum Tunneling in Spin SystemsThe point-particle-like Hamiltonian of a biaxial spin particle with external magnetic field along the hard axis is obtained in terms of the potential field description of spin systems with exact…J. -Q. Liang, H. J. W. Müller-Kirsten, D. K. Park et al.·Jan 11, 2000SaveLearn
Motion of Quantized Vortices as Elementary ObjectsThe general local, nondissipative equations of motion for a quantized vortex moving in an uncharged laboratory superfluid are derived from a relativistic, co-ordinate invariant framework, having…Uwe R. Fischer·Jan 10, 2000SaveLearn
A scalable solid-state quantum computer based on quantum dot pillar structuresWe investigate an optically driven quantum computer based on electric dipole transitions within coupled single-electron quantum dots. Our quantum register consists of a freestanding n-type pillar…G. D. Sanders, K. W. Kim, W. C. Holton·Jan 10, 2000SaveLearn
Field Dependent Specific-Heat of Rare Earth ManganitesThe low temperature specific heat C(H) of several rare-earth manganites (La(0.7)Sr(0.3)MnO(3), Nd(0.5)Sr(0.5)MnO(3), Pr(0.5)Sr(0.5)MnO(3), La(0.67)Ca(0.33)MnO$(3),…M. Roy, J. F. Mitchell, S. J. Potashnik et al.·Jan 8, 2000SaveLearn
Concentration-Pressure phase diagram for rich Zr PZT ceramicsThis work reports on the systematic high pressure Raman studies in the PbZr1-xTixO3 (0.02 ≤ x ≤ 0.14) ceramics performed at room temperature. The pressure dependence of the Raman…A. G. Souza Filho, P. T. C. Freire, A. P. Ayala et al.·Jan 8, 2000SaveLearn
Kinetics of spin coherence of electrons in an undoped semiconductor quantum wellWe study the kinetics of spin coherence of optically excited electrons in an undoped insulating ZnSe/Zn1-xCdxSe quantum well under moderate magnetic fields in the Voigt configuration. After…M. W. Wu, H. Metiu·Jan 8, 2000SaveLearn
Thermodynamic and spectroscopic properties and low temperature thermochromism of chromium tris-acetylacetonateTwo narrow anomalies with peaks at 30 K and 60 K and a wide diffuse anomaly within the range 110-240 K have been found in a low temperature heat capacity of chromium…V. N. Naumov, G. I. Frolova, V. V. Nogteva et al.·Jan 8, 2000SaveLearn
Theory of the spin bathThe quantum dynamics of mesoscopic or macroscopic systems is always complicated by their coupling to many "environmental" modes.At low T these environmental effects are dominated by localised…Nikolay Prokof'ev, Philip Stamp·Jan 7, 2000SaveLearn
Soft spin waves in the low temperature thermodynamics of Pr0.7Ca0.3MnO3We present a detailed magnetothermal study of Pr(0.7)Ca(0.3)MnO(3), a perovskite manganite in which an insulator-metal transition can be driven by magnetic field, but also by pressure, visible light,…M. Roy, J. F. Mitchell, A. P. Ramirez et al.·Jan 6, 2000SaveLearn
Similarity Solutions and Collapse in the Attractive Gross-Pitaevskii EquationWe analyse a generalised Gross-Pitaevskii equation involving a paraboloidal trap potential in D space dimensions and generalised to a nonlinearity of order 2n+1. For attractive coupling…Andrei Rybin, Gennadii Varzugin, Markus Lindberg et al.·Jan 6, 2000SaveLearn
The effect of compression on the global optimization of atomic clustersRecently, Locatelli and Schoen proposed a transformation of the potential energy that aids the global optimization of Lennard-Jones clusters with non-icosahedral global minima. These cases are…Jonathan Doye·Jan 6, 2000SaveLearn
Time Dependent Effects and Transport Evidence for Phase Separation in La0.5Ca0.5MnO3The ground state of La1-xCaxMnO3 changes from a ferromagnetic metallic to an antiferromagnetic charge-ordered state as a function of Ca concentration at x ~ 0.50. We present evidence from…M. Roy, J. F. Mitchell, P. Schiffer·Jan 6, 2000SaveLearn
Study of Ce intermetallic compounds: an LDA classification and hybridization effectsSpin-polarized calculations within the LDA approximation have been done with the goal of characterizing Ce intermetallic compounds. Symmetry and chemical environment effects on 4f hybridization and,…V. L. Vildosola, A. M. Llois·Jan 5, 2000SaveLearn
Phase ordering at the lambda transition in liquid 4-HeA modified ideal Bose gas model is proposed as an approach for liquid helium at the lambda point. The decisive modification of the ideal Bose gas model is the use of phase ordered single particle…Torsten Fliessbach·Jan 5, 2000SaveLearn
Electron-phonon interaction in C70The matrix elements of the deformation potential of C70 are calculated by means of a simple, yet accurate solution of the electron-phonon coupling problem in fullerenes, based on a…D. Provasi, N. Breda, R. A. Broglia et al.·Jan 5, 2000SaveLearn
Circularly polarized light emission in scanning tunneling microscopy of magnetic systemsLight is produced when a scanning tunneling microscope is used to probe a metal surface. Recent experiments on cobalt utilizing a tungsten tip found that the light is circularly polarized; the sense…S. P. Apell, D. R. Penn, P. Johansson·Jan 5, 2000SaveLearn
Extinction transition in bacterial colonies under forced convectionWe report the spatio-temporal response of Bacillus subtilis growing on a nutrient-rich layer of agar to ultra-violet (UV) radiation. Below a crossover temperature, the bacteria are confined to…T. Neicu, A. Pradhan, D. A. Larochelle et al.·Jan 3, 2000SaveLearn
Non-linear Transport in Quantum-Hall SmecticsRecent transport experiments have established that two-dimensional electron systems with high-index partial Landau level filling, ν* =ν- ν, have ground states with broken…A. H. MacDonald, Matthew P. A. Fisher·Jan 3, 2000SaveLearn
Advantages and Disadvantages of Layer Growth Model in Which Particles Maximize Number of Lateral BondsIn this paper we would like give a short review of our recent works and current investigation in modeling of solid film surfaces growth based on computer Monte Carlo simulations. We also discuss…K. Malarz·Jan 3, 2000SaveLearn
Spin-Peierls instability in the spin-1/2 transverse XX chain with Dzyaloshinskii-Moriya interactionWe calculate exactly the density of magnon states of the regularly alternating spin-1/2 XX chain with Dzyaloshinskii-Moriya interaction. The obtained results permit us to examine the stability of the…O. Derzhko, J. Richter, O. Zaburannyi·Jan 3, 2000SaveLearn
Spin-1/2 transverse XX chain with a correlated disorder: dynamics of the transverse correlationsWe examine numerically the dynamics of zz correlations in the spin-1/2 isotropic XY chain with random intersite coupling and on-site transverse field that depends linearly on the neighbouring…Oleg Derzhko, Taras Krokhmalskii·Jan 3, 2000SaveLearn
Condensed Matter Physics - Biology ResonanceThe field of condensed matter physics had its genesis this century and it has had a remarkable evolution. A closer look at its growth reveals a hidden aim in the collective consciousness of the field…G. Baskaran·Jan 3, 2000SaveLearn
Spin correlations in nonlinear optical response: Light-induced Kondo effectWe study the role of spin correlations in nonlinear absorption due to optical transitions from a deep impurity level to states above a Fermi sea. We demonstrate that the Hubbard repulsion between two…T. V. Shahbazyan, I. E. Perakis, M. E. Raikh·Dec 31, 1999SaveLearn
Order induced by dipolar interactions in a geometrically frustrated antiferromagnetWe study the classical Heisenberg model for spins on a pyrochlore lattice interacting via long range dipole-dipole forces and nearest neighbor exchange. Antiferromagnetic exchange alone is known not…S. E. Palmer, J. T. Chalker·Dec 31, 1999SaveLearn
Analytical stripe phase solution for the Hubbard modelThe self-consistent solution for the spin-charge solitonic superstructure in quasi-one-dimensional electron system is obtained in the framework of the Hubbard model as a function of a hole doping.…S. I. Matveenko, S. I. Mukhin·Dec 30, 1999SaveLearn