Pure and random quantum Ising chain : Shannon and Renyi entropies of the ground state via real space renormalization

Cécile Monthus (1)

1 IPHT - Institut de Physique Théorique - UMR CNRS 3681

The Shannon and the Renyi entropies of the ground state wavefunction in the pure and in the random quantum Ising chain are studied via the self-dual Fernandez-Pacheco real-space renormalization procedure. In particular, we analyze the critical behavior of the leading extensive term at the quantum phase transition : the derivative with respect to the control parameter is found to be logarithmically divergent in the pure case, and to display a cusp singularity in the random case. This cusp singularity for the random case is also derived via the Strong Disorder Renormalization approach.

Domaines: Physique [physics]

Cécile Monthus. Pure and random quantum Ising chain : Shannon and Renyi entropies of the ground state via real space renormalization. Journal of Statistical Mechanics: Theory and Experiment, 2015, 2015 (04), pp.P04007. ⟨10.1088/1742-5468/2015/04/P04007⟩. ⟨cea-01322501⟩