Description of orbital and spin excitations within a projected spherical single-particle basis

1995 ◽  
Vol 584 (1) ◽  
pp. 84-102 ◽  
Author(s):  
A.A. Raduta ◽  
N. Lo Iudice ◽  
I.I. Ursu
2012 ◽  
Vol 26 (30) ◽  
pp. 1250154 ◽  
Author(s):  
KYOHEI NAKANO ◽  
ROBERT EDER ◽  
YUKINORI OHTA

We study the one-dimensional double-exchange model with L localized spins and one mobile electron. We solve the Schrödinger equation analytically and obtain the energies and wavefunctions for all the eigenstates with spin S = (l-1)/2 exactly. As an application, we compute the single-particle Green's function. We show that, for vanishing exchange interactions between localized spins, the single-particle spectrum is entirely incoherent and the lowest band has an infinite band mass, i.e., the single electron is localized due to its interaction with the spin excitations. For nonvanishing exchange interactions between localized spins, the lower edge of the spectrum acquires a dispersion but the spectrum remains incoherent with no well-defined quasiparticle peak.


1993 ◽  
Vol 551 (1) ◽  
pp. 93-108 ◽  
Author(s):  
A.A. Raduta ◽  
D.S. Delion ◽  
N. Lo Iudice

1968 ◽  
Vol 49 (3) ◽  
pp. 445-476 ◽  
Author(s):  
A Agodi ◽  
F Catara ◽  
M Di Toro

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
Angelo Signoracci ◽  
B. Alex Brown ◽  
Morten Hjorth-Jensen

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