31,413 research outputs found

    Microscopic calculation of the phonon dynamics of Sr2_{2}RuO4_{4} compared with La2_{2}CuO4_{4}

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    The phonon dynamics of the low-temperature superconductor Sr2_{2}RuO4_{4} is calculated quantitatively in linear response theory and compared with the structurally isomorphic high-temperature superconductor La2_{2}CuO4_{4}. Our calculation corrects for a typical deficit of LDA-based calculations which always predict a too large electronic kzk_{z}-dispersion insufficient to describe the c-axis response in the real materials. With a more realistic computation of the electronic band structure the frequency and wavevector dependent irreducible polarization part of the density response function is determined and used for adiabatic and nonadiabatic phonon calculations. Our analysis for Sr2_{2}RuO4_{4} reveals important differences from the lattice dynamics of pp- and nn-doped cuprates. Consistent with experimental evidence from inelastic neutron scattering the anomalous doping related softening of the strongly coupling high-frequency oxygen bond-stretching modes (OBSM) which is generic for the cuprate superconductors is largely suppressed or completely absent, respectively, depending on the actual value of the on-site Coulomb repulsion of the Ru4d orbitals. Also the presence of a characteristic Λ1\Lambda_{1}-mode with a very steep dispersion coupling strongly with the electrons is missing in Sr2_{2}RuO4_{4}. Moreover, we evaluate the possibility of a phonon-plasmon scenario for Sr2_{2}RuO4_{4} which has been shown recently to be realistic for La2_{2}CuO4_{4}. In contrast to La2_{2}CuO4_{4} in Sr2_{2}RuO4_{4} the very low lying plasmons are overdamped along the c-axis.Comment: 30 pages, 16 figures, 4 tables, 33 reference

    Simple proof of gauge invariance for the S-matrix element of strong-field photoionization

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    The relationship between the length gauge (LG) and the velocity gauge (VG) exact forms of the photoionization probability amplitude is considered. Our motivation for this paper comes from applications of the Keldysh-Faisal-Reiss (KFR) theory, which describes atoms (or ions) in a strong laser field (in the nonrelativistic approach, in the dipole approximation). On the faith of a certain widely-accepted assumption, we present a simple proof that the well-known LG form of the exact photoionization (or photodetachment) probability amplitude is indeed the gauge-invariant result. In contrast, to obtain the VG form of this probability amplitude, one has to either (i) neglect the well-known Goeppert-Mayer exponential factor (which assures gauge invariance) during all the time evolution of the ionized electron or (ii) put some conditions on the vector potential of the laser field.Comment: The paper was initially submitted (in a previous version) on 16 October 2006 to J. Phys. A and rejected. This is the extended version (with 2 figures), which is identical to the paper published online on 12 December 2007 in Physica Script

    A dynamical time operator in Dirac's relativistic quantum mechanics

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    A self-adjoint dynamical time operator is introduced in Dirac's relativistic formulation of quantum mechanics and shown to satisfy a commutation relation with the Hamiltonian analogous to that of the position and momentum operators. The ensuing time-energy uncertainty relation involves the uncertainty in the instant of time when the wave packet passes a particular spatial position and the energy uncertainty associated with the wave packet at the same time, as envisaged originally by Bohr. The instantaneous rate of change of the position expectation value with respect to the simultaneous expectation value of the dynamical time operator is shown to be the phase velocity, in agreement with de Broglie's hypothesis of a particle associated wave whose phase velocity is larger than c. Thus, these two elements of the original basis and interpretation of quantum mechanics are integrated into its formal mathematical structure. Pauli's objection is shown to be resolved or circumvented. Possible relevance to current developments in interference in time, in Zitterbewegung like effects in spintronics, grapheme and superconducting systems and in cosmology is noted

    Stress engineering at the nanometer scale: Two-component adlayer stripes

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    Spontaneously formed equilibrium nanopatterns with long-range order are widely observed in a variety of systems, but their pronounced temperature dependence remains an impediment to maintain such patterns away from the temperature of formation. Here, we report on a highly ordered stress-induced stripe pattern in a two-component, Pd-O, adsorbate monolayer on W(110), produced at high temperature and identically preserved at lower temperatures. The pattern shows a tunable period (down to 16 nm) and orientation, as predicted by a continuum model theory along with the surface stress and its anisotropy found in our DFT calculations. The control over thermal fluctuations in the stripe formation process is based on the breaking/restoring of ergodicity in a high-density lattice gas with long-range interactions upon turning off/on particle exchange with a heat bath.Comment: 6 pages, 4 figure

    Ds+ϕρ+D_s^+ \to \phi \rho^+ Decay

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    Motivated by the experimental measurement of the decay rate, Γ\Gamma, and the longitudinal polarization, PLP_L, in the Cabibbo favored decay Ds+ϕρ+D_s^+\to \phi {\rho}^{+}, we have studied theoretical prediction within the context of factorization approximation invoking several form factors models. We were able to obtain agreement with experiment for both Γ\Gamma and PLP_L by using experimentally measured values of the form factors A1Dsϕ(0)A_1^{D_s\phi}(0), A2Dsϕ(0)A_2^{D_s\phi}(0) and VDsϕ(0)V^{D_s\phi}(0) in the semi-leptonic decay Ds+ϕl+νlD_s^+\to \phi l^{+}\nu_{l}. We have also included in our calculation the effect of the final state interaction (fsifsi) by working with the partial waves amplitudes SS, PP and DD. Numerical calculation shows that the decay amplitude is dominated by SS wave, and that the polarization is sensitive to the interference between SS and DD waves. The range of the phase difference δSD=δSδD\delta_{SD} = \delta_S - \delta_D accommodated by experimental error in PLP_L is large.Comment: 7 pages, LaTe

    B ->PV Decays in the QCD Improved Factorization Approach

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    Motivated by recent CELO measurements and the progress of the theory of B decays, we investigate BPV(P=π,K.V=K,ρ,ω)B\to P V(P=\pi,K. V= K^{*},\rho,\omega) decay modes in the framework of QCD improved factorization. We find that all the measured branching ratios are well accommodated in the reasonable parameter space and predictions for the other decay modes are well below the experimental upper limits. We also have calculated CP asymmetries in these decay modes.Comment: 24 pages, LaTex-2e, typos correcte

    Chiral spin liquid and emergent anyons in a Kagome lattice Mott insulator

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    Topological phases in frustrated quantum spin systems have fascinated researchers for decades. One of the earliest proposals for such a phase was the chiral spin liquid put forward by Kalmeyer and Laughlin in 1987 as the bosonic analogue of the fractional quantum Hall effect. Elusive for many years, recent times have finally seen a number of models that realize this phase. However, these models are somewhat artificial and unlikely to be found in realistic materials. Here, we take an important step towards the goal of finding a chiral spin liquid in nature by examining a physically motivated model for a Mott insulator on the Kagome lattice with broken time-reversal symmetry. We first provide a theoretical justification for the emergent chiral spin liquid phase in terms of a network model perspective. We then present an unambiguous numerical identification and characterization of the universal topological properties of the phase, including ground state degeneracy, edge physics, and anyonic bulk excitations, by using a variety of powerful numerical probes, including the entanglement spectrum and modular transformations.Comment: 9 pages, 9 figures; partially supersedes arXiv:1303.696

    A lower bound for the BCS functional with boundary conditions at infinity

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    We consider a many-body system of fermionic atoms interacting via a local pair potential and subject to an external potential within the framework of BCS theory. We measure the free energy of the whole sample with respect to the free energy of a reference state which allows us to define a BCS functional with boundary conditions at infinity. Our main result is a lower bound for this energy functional in terms of expressions that typically appear in Ginzburg-Landau functionals.Comment: 32 page

    Excited Boundary TBA in the Tricritical Ising Model

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    By considering the continuum scaling limit of the A4A_{4} RSOS lattice model of Andrews-Baxter-Forrester with integrable boundaries, we derive excited state TBA equations describing the boundary flows of the tricritical Ising model. Fixing the bulk weights to their critical values, the integrable boundary weights admit a parameter ξ\xi which plays the role of the perturbing boundary field ϕ1,3\phi_{1,3} and induces the renormalization group flow between boundary fixed points. The boundary TBA equations determining the RG flows are derived in the B(1,2)B(2,1)\mathcal{B}_{(1,2)}\to \mathcal{B}_{(2,1)} example. The induced map between distinct Virasoro characters of the theory are specified in terms of distribution of zeros of the double row transfer matrix.Comment: Latex, 14 pages - Talk given at the Landau meeting "CFT and Integrable Models", Sept. 2002 - v2: some statements about ϕ1,2\phi_{1,2} perturbations correcte
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