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Anisotropic charge Kondo effect in a triple quantum dot.
Gwangsu Yoo1, Jinhong Park1, S-S B Lee1
1Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Physical Review Letters
|December 20, 2014
Summary
We predict an anisotropic charge Kondo effect in triple quantum dots. This effect exhibits two distinct phases, Kondo-screened and ferromagnetic, identifiable via electron conductance measurements.
Area of Science:
- Condensed Matter Physics
- Quantum Dot Physics
- Mesoscopic Physics
Background:
- Quantum dots offer tunable platforms for studying quantum phenomena.
- The Kondo effect typically involves magnetic impurities interacting with conduction electrons.
- Anisotropic interactions can lead to novel electronic phases.
Purpose of the Study:
- To predict and characterize a novel anisotropic charge Kondo effect in a triple quantum dot system.
- To identify the conditions for the emergence of this effect, specifically twofold degenerate ground states.
- To explore the relationship between charge fluctuations and Kondo physics in this system.
Main Methods:
- Utilizing bosonization and refermionization techniques to analyze the quantum dot system.
- Investigating the low-temperature behavior of charge fluctuations.
- Relating the observed phases to established models like the anisotropic Kondo model.
Main Results:
- Prediction of an anisotropic charge Kondo effect in triple quantum dots with (1,1,0) and (0,0,1) charge configurations.
- Identification of two distinct low-temperature phases: massive charge fluctuations (Kondo-screened) and vanishing fluctuations (ferromagnetic).
- Demonstration that the phase transition is detectable through electron conductance measurements.
Conclusions:
- The anisotropic charge Kondo effect provides a new avenue for exploring quantum phenomena in quantum dots.
- Experimental verification is feasible via electron conductance measurements, linking to the anisotropic Kondo model.
- The effect shares similarities with Kondo effects in negative-U Anderson impurities.
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