Abstract
The Kondo effect plays an important role in emergence of electric polarization in a triangular triple-quantum-dot system, where one of the three dots is point-contacted with a single lead, and a magnetic flux penetrates through the triangular loop. The Kondo-induced electric polarization exhibits an Aharonov-Bohm type oscillation as a function of the magnetic flux. Our theoretical study shows various oscillation patterns associated with the field-dependent mixing of twofold orbitally degenerate ground states and their sensitivity to the point contact.
Highlights
Recent nanofabrication techniques have accelerated investigation of the Kondo effect in various multiple-quantum-dot systems [1, 2, 3]
According to Bulaevskii et al [11], the operator for the electric polarization is expressed by the correlation among on-site spin operators Si (i = a, b, c) as a consequence of electron hopping in the closed loop
In the TTQD Kondo system, we demonstrated how the emergent electric polarization is modulated by the magnetic flux through the triangular loop, which is associated with a cross correlation between spin and charge degrees of freedom
Summary
Recent nanofabrication techniques have accelerated investigation of the Kondo effect in various multiple-quantum-dot systems [1, 2, 3]. The TTQD ground states are fourfold degenerate with respect to the spin and orbital degrees of freedom when the magnetic flux is absent (Φ = 0). According to Bulaevskii et al [11], the operator for the electric polarization is expressed by the correlation among on-site spin operators Si (i = a, b, c) as a consequence of electron hopping in the closed loop.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
