# Magnetic Kondo regimes in a frustrated half-filled trimer

@article{Wojcik2020MagneticKR, title={Magnetic Kondo regimes in a frustrated half-filled trimer}, author={K. P. W'ojcik and I. Weymann and Johann Kroha}, journal={arXiv: Strongly Correlated Electrons}, year={2020} }

We analyze theoretically the phase diagram of a triangular triple quantum dot with strong onsite repulsion coupled to ferromagnetic leads. This model includes the competition of magnetic ordering of local or itinerant magnetic moments, geometric frustration and Kondo screening. We identify all the phases resulting from this competition. We find that three Kondo phases -- the conventional one, the two-stage underscreened one, and the one resulting from the ferromagnetic Kondo effect -- can be… Expand

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#### References

SHOWING 1-10 OF 122 REFERENCES

Two-channel Kondo phases and frustration-induced transitions in triple quantum dots

- Physics
- 2010

We consider a ring of three quantum dots mutually coupled by antiferromagnetic exchange interactions, and tunnel-coupled to two metallic leads: the simplest device in which the consequences of local… Expand

Frustration and the Kondo Effect in Heavy Fermion Materials

- Physics
- 2010

The observation of a separation between the antiferromagnetic phase boundary and the small-large Fermi surface transition in recent experiments has led to the proposal that frustration is an… Expand

Local moment formation and Kondo screening in impurity trimers.

- Chemistry, Medicine
- The journal of physical chemistry. B
- 2013

A triangular cluster of three magnetic impurities, hybridizing locally with conduction electrons of a metallic host, is studied theoretically, finding unusual mechanisms for local moment formation and Kondo screening are found due to the orbital structure of the impurity trimer. Expand

Kondo lattices with inequivalent local moments: Competitive versus cooperative Kondo screening

- Physics
- 2011

While standard heavy fermion metals feature a single spin-1/2 local moment per unit cell, more complicated systems with multiple distinct local moments have been synthesized as well, with… Expand

Frustrated Kondo impurity triad: A toy model of deconfinement

- Physics
- 2020

Deconfinement in gauge theories and symmetry-protected topological order are central to our understanding of strongly correlated quantum materials. A question of crucial importance regards the… Expand

Entropy Evolution in the Magnetic Phases of Partially Frustrated CePdAl.

- Physics, Medicine
- Physical review letters
- 2017

In the field range where the Kondo screening is suppressed, the liberated moments tend to maximize the magnetic entropy and strongly enhance the frustration, which may be a promising candidate to search for a quantum spin liquid. Expand

Global magnetic phase diagram and local quantum criticality in heavy fermion metals

- Physics
- 2006

We address the global magnetic phase diagram of Kondo lattice systems. Through the distinct Fermi surface properties of the various phases at zero temperature, we argue that the phase diagram… Expand

Heavy-fermion and spin-liquid behavior in a Kondo lattice with magnetic frustration

- Physics
- 2002

We study the competition between the Kondo effect and frustrating exchange interactions in a Kondo-lattice model within a large-${\cal N}$ dynamical mean-field theory. We find a T=0 phase transition… Expand

Ferromagnetic Kondo effect in a triple quantum dot system.

- Physics, Medicine
- Physical review letters
- 2013

A simple device of three laterally coupled quantum dots, the central one contacted by metal leads, provides a realization of the ferromagnetic Kondo model, which is characterized by interesting… Expand

Quantum phase transition in quantum dot trimers

- Physics
- 2009

We investigate a system of three tunnel-coupled semiconductor quantum dots in a triangular geometry, one of which is connected to a metallic lead, in the regime where each dot is essentially singly… Expand