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- Institute for Research in Fundamental SciencesIR578 papers
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52 papers · 1 filter
Conformal Curves on Surface
A. A. Saberi, M. A. Rajabpour, S. Rouhani
We have studied the iso-height lines on the surface as a physical candidate for conformally invariant curves. We have shown that these lines are conformally invaria…
Choice Number and Energy of Graphs
Saieed Akbari, Ebrahim Ghorbani
The energy of a graph G, denoted by E(G), is defined as the sum of the absolute values of all eigenvalues of G. It is proved that E(G)>= 2(n-χ(\bar{G}))>= 2(ch(G)-1) for every grap…
The matrix product representations for all valence bond states
Vahid Karimipour, Laleh Memarzadeh
We introduce a simple representation for irreducible spherical tensor operators of the rotation group of arbitrary integer or half integer rank and use these tensor operators to co…
Thermodynamic Properties of XXZ model in a Transverse Field
M. Siahatgar, A. Langari
We have numerically studied the thermodynamic properties of the spin 1/2 XXZ chain in the presence of a transverse (non commuting) magnetic field. The thermal, field dependence of…
Effect of disorder on the ground-state properties of graphene
R. Asgari, M. M. Vazifeh, M. R. Ramezanali +2
We calculate the ground-state energy of Dirac electrons in graphene in the presence of disorder. We take randomly distributed charged impurities at a fixed distance from the graphe…
Seeking better times: atomic clocks in the generalized Tonks-Girardeau regime
S. V. Mousavi, A. del Campo, I. Lizuain +2
This article is based on the talk with the same title at the Blaubeuren meeting. First we discuss briefly the importance of time and time keeping, explaining the basic functioning…