Mura, Federica ; Bhattacharjee, Somendra M. ; Maji, Jaya ; Masetto, Mario ; Seno, Flavio ; Trovato, Antonio (2016) Efimov-Like Behaviour in Low-Dimensional Polymer Models Journal of Low Temperature Physics, 185 (1-2). pp. 102-121. ISSN 0022-2291
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Official URL: http://doi.org/10.1007/s10909-016-1627-4
Related URL: http://dx.doi.org/10.1007/s10909-016-1627-4
Abstract
In the quantum Efimov effect, identical bosons form infinitely many bound trimer states at the bound dimer dissociation threshold, with their energy spectrum obeying a universal geometrical scaling law. Inspired by the formal correspondence between the possible trajectories of a quantum particle and the possible conformations of a polymer chain, the existence of a triple-stranded DNA bound state when a double- stranded DNA is not stable was recently predicted by modelling three directed polymer chains in low-dimensional lattices, both fractal (d < 1) and euclidean (d = 1). A finite melting temperature for double-stranded DNA requires in d ≤ 2 the introduction of a weighting factor penalizing the formation of denaturation bubbles, that is non-base paired portions of DNA. The details of how bubble weighting is defined for a three- chain system were shown to crucially affect the presence of Efimov-like behaviour on a fractal lattice. Here we assess the same dependence on the euclidean 1 + 1 lattice, by setting up the transfer matrix method for three infinitely long chains confined in a finite size geometry. This allows us to discriminate unambiguously between the absence of Efimov-like behaviour and its presence in a very narrow temperature range, in close correspondence with what was already found on the fractal lattice. When present, however, no evidence is found for triple-stranded bound states other than the ground state at the two-chain melting temperature.
Item Type: | Article |
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Source: | Copyright of this article belongs to Springer-Verlag. |
ID Code: | 133917 |
Deposited On: | 02 Jan 2023 10:00 |
Last Modified: | 02 Jan 2023 10:00 |
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