Ferromagnetic and underscreened Kondo behavior in quantum dot arrays
نویسندگان
چکیده
منابع مشابه
Kondo effect in a quantum dot coupled to ferromagnetic leads: a numerical renormalization group analysis.
We investigate the effects of spin-polarized leads on the Kondo physics of a quantum dot using the numerical renormalization group method. Our study demonstrates in an unambiguous way that the Kondo effect is not necessarily suppressed by the lead polarization: While the Kondo effect is quenched for the asymmetric Anderson model, it survives even for finite polarizations in the regime where cha...
متن کاملTunable Kondo effect in a double quantum dot coupled to ferromagnetic contacts.
We investigate the effects induced by ferromagnetic contacts attached to a serial double quantum dot. Spin polarization generates effective magnetic fields and suppresses the Kondo effect in each dot. The superexchange interaction J(AFM), tuned by the interdot tunneling rate t, can be used to compensate the effective fields and restore the Kondo resonance when the contact polarizations are alig...
متن کاملLinear Kondo conductance in a quantum dot
In a tunneling experiment across a quantum dot it is possible to change the coupling between the dot and the contacts at will, by properly tuning the transparency of the barriers and the temperature. Gate voltages allow for changes of the relative position of the dot addition energies and the Fermi level of the leads. Here we discuss the two limiting cases: weak and strong coupling in the tunne...
متن کاملQuantum phase transition and underscreened Kondo effect in electron transport through parallel double quantum dots.
We investigate electronic transport through a parallel double quantum dot (DQD) system with strong on-site Coulomb interaction and capacitive interdot coupling. By applying the numerical renormalization group (NRG) method, the ground state of the system and the transmission probability at zero temperature have been obtained. For a system of quantum dots with degenerate energy levels and small i...
متن کاملKondo quantum dot coupled to ferromagnetic leads: Numerical renormalization group study
M. Sindel,1 L. Borda,1,2 J. Martinek,3,4,5 R. Bulla,6 J. König,7 G. Schön,5 S. Maekawa,3 and J. von Delft1 1Physics Department, Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience, Ludwig-Maximilians-Universität München, 80333 München, Germany 2Research Group “Theory of Condensed Matter” of the Hungarian Academy of Sciences, TU Budapest, Budapest H-1521, Hungary 3Instit...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2015
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.92.165416