Sources of negative tunneling magnetoresistance in multilevel quantum dots with ferromagnetic contacts
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Sources of negative tunneling magnetoresistance in multilevel quantum dots with ferromagnetic contacts. / Koller, Sonja; Grifoni, Milena; Paaske, Jens.
In: Physical Review B Condensed Matter, Vol. 85, No. 4, 045313, 13.01.2012.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Sources of negative tunneling magnetoresistance in multilevel quantum dots with ferromagnetic contacts
AU - Koller, Sonja
AU - Grifoni, Milena
AU - Paaske, Jens
PY - 2012/1/13
Y1 - 2012/1/13
N2 - We analyze distinct sources of spin-dependent energy level shifts and their impact on the tunneling magnetoresistance (TMR) of interacting quantum dots coupled to collinearly polarized ferromagnetic leads. Level shifts due to virtual charge fluctuations can be quantitatively evaluated within a diagrammatic representation of our transport theory. The theory is valid for multilevel quantum dot systems and we exemplarily apply it to carbon nanotube quantum dots, where we show that the presence of many levels, among them of excited states, can qualitatively influence the TMR effect.
AB - We analyze distinct sources of spin-dependent energy level shifts and their impact on the tunneling magnetoresistance (TMR) of interacting quantum dots coupled to collinearly polarized ferromagnetic leads. Level shifts due to virtual charge fluctuations can be quantitatively evaluated within a diagrammatic representation of our transport theory. The theory is valid for multilevel quantum dot systems and we exemplarily apply it to carbon nanotube quantum dots, where we show that the presence of many levels, among them of excited states, can qualitatively influence the TMR effect.
KW - Faculty of Science
KW - Condensed matter physics
KW - Nano electronics
U2 - 10.1103/PhysRevB.85.045313
DO - 10.1103/PhysRevB.85.045313
M3 - Journal article
VL - 85
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 4
M1 - 045313
ER -
ID: 36141484