Quantum Protectorate and Microscopic Models of Magnetism

Details Quantum Protectorate and Microscopic Models of Magnetism Quantum Protectorate and Microscopic Models of Magnetism

2002-08-12

arxiv.org/abs/cond-mat/0208222v1

International Journal of Modern Physics B16 (2002) 803-823

Physics

Condensed Matter

Strongly Correlated Electrons

26 pages, 1 figure

Scientific paper

10.1142/S0217979202010002

Some physical implications involved in a new concept, termed the "quantum protectorate" (QP), are developed and discussed. This is done by considering the idea of quantum protectorate in the context of quantum theory of magnetism. It is suggested that the difficulties in the formulation of quantum theory of magnetism at the microscopic level, that are related to the choice of relevant models, can be understood better in the light of the QP concept . We argue that the difficulties in the formulation of adequate microscopic models of electron and magnetic properties of materials are intimately related to dual, itinerant and localized behaviour of electrons. We formulate a criterion of what basic picture describes best this dual behaviour. The main suggestion is that quasi-particle excitation spectra might provide distinctive signatures and good criteria for the appropriate choice of the relevant model.

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