A new boson expansion theory utilizing a norm operator

Abstract We propose a new boson expansion method using a norm operator. The small parameter expansion, in which the boson approximation becomes the zeroth-order approximation, requires double commutation relations between phonon operators that are not closed between the phonon excitation modes adopt...

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Veröffentlicht in:	Progress of Theoretical and Experimental Physics 2023-07, Vol.2023 (7), p.1
1. Verfasser:	Taniguchi, Kimikazu
Format:	Artikel
Sprache:	eng
Schlagworte:	Bosons Operator theory
Online-Zugang:	Volltext
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