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Mathematical Physics, Analysis and Geometry

, Volume 17, Issue 3–4, pp 441–464 | Cite as

Phase Transition in the Density of States of Quantum Spin Glasses

  • László Erdős
  • Dominik SchröderEmail author
Article

Abstract

We prove that the empirical density of states of quantum spin glasses on arbitrary graphs converges to a normal distribution as long as the maximal degree is negligible compared with the total number of edges. This extends the recent results of Keating et al. (2014) that were proved for graphs with bounded chromatic number and with symmetric coupling distribution. Furthermore, we generalise the result to arbitrary hypergraphs. We test the optimality of our condition on the maximal degree for p-uniform hypergraphs that correspond to p-spin glass Hamiltonians acting on n distinguishable spin- 1/2 particles. At the critical threshold p = n1/2 we find a sharp classical-quantum phase transition between the normal distribution and the Wigner semicircle law. The former is characteristic to classical systems with commuting variables, while the latter is a signature of noncommutative random matrix theory.

Keywords

Wigner semicircle law Quantum spin glass Sparse random matrix 

Mathematics Subject Classification (2010)

15A52 82D30 

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.IST AustriaKlosterneuburgAustria
  2. 2.Ludwig-Maximilians-Universität MünchenMünchenGermany

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