Prediction of ferromagnetic correlations in coupled double-level quantum dots

Physical Review Letters

Volumn 94, Issue 2, 2005, Pages

  Martins, G B ^a,d   Busser C A ^b,c   Al Hassanieh, K A ^b,c,d   Moreo, A ^b,c   Dagotto, E ^b,c  

^a OAKLAND UNIVERSITY   (United States)

^b OAK RIDGE NATIONAL LABORATORY   (United States)

^c UNIVERSITY OF TENNESSEE   (United States)

^d Florida State University   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DYSON EQUATIONS; HUND COUPLING; KONDO RESONANCE; MAGNETIC STATES;

ANTIFERROMAGNETISM; ELECTRIC CONDUCTANCE; ELECTRON TUNNELING; FERMI LEVEL; GREEN'S FUNCTION; HAMILTONIANS; TRANSPORT PROPERTIES;

SEMICONDUCTOR QUANTUM DOTS;

EID: 18144382333     PISSN: 00319007     EISSN: 10797114     Source Type: Journal    
DOI: 10.1103/PhysRevLett.94.026804     Document Type: Article

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19. 2}.
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22. T gives a good indication on the nature of the Kondo effect (S = 1/2 or S = 1).
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24. ′ terms) by using the following argument: At 1/4 filling (two electrons in the four levels), the hopping from one lead to the adjacent dot (and vice versa) is maximized when the spins of the electrons in the levels α and β in the same QD are parallel to each other. A strong interdot tunneling then generates an effective FM coupling between the QDs. Therefore, the only restriction for the FM coupling seems to be that the leads should have just one conduction channel.