L. T. Wille

Publications (2)2.26 Total impact

• Source

  Available from: arxiv.org

  Article: Bubble statistics and dynamics in double-stranded DNA.

  B S Alexandrov, L T Wille, K Ø Rasmussen, A R Bishop, K B Blagoev
  [show abstract] [hide abstract]
  ABSTRACT: The dynamical properties of double-stranded DNA are studied in the framework of the Peyrard-Bishop-Dauxois model using Langevin dynamics. Our simulations are analyzed in terms of two distribution functions describing localized separations ("bubbles") of the double strand. The result that the bubble distributions are more sharply peaked at the active sites than thermodynamically obtained distributions is ascribed to the fact that the bubble lifetimes affect the distributions. Certain base-pair sequences are found to promote long-lived bubbles, and we argue that this is a result of length scale competition between the nonlinearity and disorder present in the system.
  Physical Review E 12/2006; 74(5 Pt 1):050901. · 2.26 Impact Factor
• Article: First-order phase transition between orthorhombic phases in YBa_ {2} Cu_ {3} O_ {z}

  K. B. Blagoev, L. T. Wille
  [show abstract] [hide abstract]
  ABSTRACT: We investigate the effects of elastic interactions and the associated orthorhombic distortion on the structural phase transitions in YBa2Cu3Oz. Starting from a two-dimensional Ising model previously demonstrated to describe accurately the high-temperature phase boundaries, we show by means of Landau theory that the square-rectangular symmetry breaking may lead to a first-order transition between the orthorhombic single- and double-cell phases at low temperatures. This explains experimental observations of phase separation between orthorhombic phases, while retaining the simplicity and predictive power of the original model.
  Phys. Rev. B. 08/1993; 48(9).