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Multistage Kondo effect in a multiterminal geometry: A modular quantum interferometer

Multistage Kondo effect in a multiterminal geometry: A modular quantum interferometer
Multistage Kondo effect in a multiterminal geometry: A modular quantum interferometer

26/01/2022

 Quantum systems characterized by an interplay between several resonance scattering channels demonstrate very rich physics. Andrei Pavlov and Mikhail Kiselev from CMSP ICTP, in collaboration with Deepak Karki from BAQIS Beijing, illustrate it considering a multistage Kondo effect in nanodevices as a paradigmatic model for a multimode resonance scattering.
 They present a full-fledged theory of the multistage Kondo effect at the strong-coupling Fermi-liquid fixed point and investigate the influence of quantum interference effects to the quantum transport observables.
The studied framework describes intrinsically multiterminal effects and allows
for a precise discrimination between different configurations of the
electron states. This provides an access to physics beyond the commonly
studied two-terminal and one- or two-mode Kondo screening. In this
contribution, they uncover various, albeit simple, ways of fine-tuning the
multiresonant Kondo channels and their interplay with each other in order
to observe the constructive/destructive interference in the simplest
possible setup.
 This minimal setup of the three-stage Kondo effect can be
used as a quantum interferometer which also contains all the physics
associated with the two-terminal Kondo paradigm and at the same time
allows a straightforward generalization to other numbers of stages. The
developed framework provides a controllable way to construct a desired
realization of the Kondo effect with a particular number of stages,
terminals, and channels from combinations of elementary “building blocks”.
 This work has recently been published in Physical Review B
 

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