Article
Doping dependence of density response and bondstretching phonons in cuprates
Physica B Condensed Matter (Impact Factor: 1.28). 01/2005; 359361:620622. DOI: 10.1016/j.physb.2005.01.170
Source: arXiv

Article: Phonon anomalies and dynamic stripes
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ABSTRACT: Stripe order where electrons selforganize into alternating periodic chargerich and magneticallyordered chargepoor parallel lines was proposed as a way of optimizing the kinetic energy of holes in a doped Mott insulator. Static stripes detected as extra peaks in diffraction patterns, appear in a number of oxide perovskites as well as some other systems. The more controversial dynamic stripes, which are not detectable by diffraction, may be universally present in copper oxide superconductors. Thus it is important to learn how to detect dynamic stripes as well as to understand their influence on electronic properties. This review article focuses on lattice vibrations (phonons) that might show signatures of the charge component of dynamic stripes. The first part of the article describes recent progress in learning about how the phonon signatures of different types of electronic charge fluctuations including stripes can be distinguished from purely structural instabilities and from each other. Then I will focus on the evidence for dynamic stripes in the phonon spectra of copper oxide superconductors.Physica C Superconductivity 02/2012; 481. · 0.72 Impact Factor 
Article: Determinant quantum Monte Carlo study of the twodimensional singleband HubbardHolstein model
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ABSTRACT: We have performed numerical studies of the HubbardHolstein model in two dimensions using determinant quantum Monte Carlo (DQMC). Here we present details of the method, emphasizing the treatment of the lattice degrees of freedom, and then study the filling and behavior of the fermion sign as a function of model parameters. We find a region of parameter space with large Holstein coupling where the fermion sign recovers despite large values of the Hubbard interaction. This indicates that studies of correlated polarons at finite carrier concentrations are likely accessible to DQMC simulations. We then restrict ourselves to the halffilled model and examine the evolution of the antiferromagnetic structure factor, other metrics for antiferromagnetic and chargedensitywave order, and energetics of the electronic and lattice degrees of freedom as a function of electronphonon coupling. From this we find further evidence for a competition between chargedensitywave and antiferromagnetic order at halffilling.Physical review. B, Condensed matter 06/2013; 87(23). · 3.77 Impact Factor 
Article: Polaron signatures in the phonon dispersion of hightemperature superconducting copper oxides
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ABSTRACT: Hightemperature superconducting copper oxides display a variety of both longrange and local lattice anomalies which are related to the onset of the pseudogap phase and / or the onset of superconductivity. Here we show that these anomalies demonstrate polaron formation where specifically the local character of the polarons plays an important role. We predict that unconventional isotope effects will appear in both the longwavelength and local lattice effects.EPL (Europhysics Letters) 03/2013; 101(4):47004. · 2.26 Impact Factor
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