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Showing 1 to 20 of 23 for “"Kondo effect"”.
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Kondo effect out of equilibrium
… for the model system of a quantum dot in the Kondo regime using the real time renormalization group (RTRG) method. This method is a functional renormalization group (RG) method allowing a non-perturbative description of correlated systems in non-equilibrium. For the Kondo quantum dot the …
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Nuclear Magnetic Resonance on the Kondo Effect
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2011-11-08T19:15:36Z No. of bitstreams: 1 1972_lo.pdf: 3080925 bytes, checksum: 84d96cc7ebfc5bf61970aa7f08cd9b18 (MD5)
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Nuclear Magnetic Resonance (Nmr) on the Kondo Effect
Made available in DSpace on 2015-05-12T22:38:51Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7309986.PDF: 2916569 bytes, checksum: 967ea9fcf2d4088b876eefe59106c062 (MD5) Previous issue date: 1972
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The Kondo effect in a single-electron transistor
The Kondo effect, which occurs when a metal with magnetic impurities is cooled to low temperatures, has been a focus of research in solid-state physics for several decades. I have designed, fabricated, and measured a system which behaves as a single "artificial" impurity in a metal, displaying the …
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Theoretical study of Kondo effect and related transport properties in topological insulator systems
This thesis presents theoretical studies of the Kondo effect and related transport properties in topological insulator systems. The thesis mainly covers two topics: the Kondo effect on the surface of a bulk topological insulator material and the Kondo effect in a topological insulator quantum dot. …
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Spin effects in single-electron transistors
… inelastic cotunneling thresholds, the spin-1/2 Kondo effect, and Fano interference. With a magnetic field parallel to the motion of the electrons, single-particle energy levels undergo Zeeman splitting according to their spin. The g-factor describing this splitting is extracted in the spin-flip …
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Magnetoconductance and Dynamic Phenomena in Single-Electron Transistors
… characteristic temperature. This is known as the Kondo effect and the characteristic temperature is called the Kondo temperature. This temperature is expected to be the only energy scale that is involved in a Kondo system. This report investigates the universality of the Kondo energy scale. …
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The diagramatical solution of the two-impurity Kondo problem
The problem of the two-impurity Kondo problem is studied via the perturbative diagrammatical method. The high-temperature magnetic susceptibility is calculated to fourth order in the coupling constant J for different regimes. The integral equations for the ground state energy are established and …
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Magnetic, thermodynamic and transport properties of the magnetic semiconductor Fe₁₋xCoxS₂ and superconducting LaSb₂
… transitions occur. We discovered that the Kondo effect is an important ingredient in the paramagnetic region of magnetic semiconductor Fe<sub>1-X</sub>Co<sub>x</sub>S<sub>2</sub>. Disorder that comes with doping, coupled with the Kondo effect and the RKKY interaction between the local …
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Quantum phenomena in disordered conductors
… theory of size and disorder dependence in the Kondo effect. We demonstrate that for a thin film of thickness L with mean-free path £, disorder provides a correction to the Kondo resistivity of the form T~ / (kFL£2 ) ln T that explains the disorder-induced depression of the Kondo effect observed …
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Quantum transport through single molecules
… well-known from solid state physics, becomes effective and leads to maximal spin ground states or energetically low lying excitations for certain charge states. These states show drastic effects in transport experiments: a complete current suppression at small but finite bias voltage and …
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Cerium and rhodium substitution in the antiferromagnetic superconductor cerium rhodium indium(5)
… in CeRhIn5, is of the same magnitude as the Kondo effect. The high temperature tail of the nuclear Schottky peak is seen in all of the data and can be accurately separated to identify the Ce f-electron contribution to the magnetic heat capacity.
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Exotic Phenomena Emerging from Localized Multipolar Degrees of Freedom
… and properties. We first examine the multipolar Kondo effect, where conduction electrons equipped with spin and orbital degrees of freedom scatter off a quantum impurity that hosts electric quadrupolar and magnetic octupolar moments. Using renormalization group methods, we uncover a number of …
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Decoherence effects in nonequilibrium transport through mesoscopic systems
… transport through a quantum dot in the Kondo regime. Interactions within the quantum dot, which are essential for the occurrence of the Kondo effect, are taken into account exactly, and a perturbative expansion is performed in the renormalised coupling between the quantum dot and the …
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A search for superconductivity in conjugated polymers
… terms, Brazovskii-Kirova symmetry breaking, and Kondo impurities. We have found that through changing the conduction charge doping level real space-charge pairs, bipolarons, can be stabilised in the presence of magnetic impurities within certain parameter regimes. This has been established …
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Theory of topological insulators and its applications
… physics such as AB and SdH oscillations, WAL, Kondo effect etc. are studied. The influence of an external magnetic field on surface states is also discussed. Finally, the proximity effect of superconductors that induce a band gap opening in a TI-SC heterostructure is computed with a modified …
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Cooling an electron gas using quantum dot based electronic refrigeration
… in bilayer 2DEGs, or interactions like the Kondo effect that occur between quantum dots and 2DEGs. The scheme we investigate is called the Quantum Dot Refrigerator (or QDR) and is based upon the energy selective transport of electrons through the singleparticle states of quantum dots. By …
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Structural, Electronic and Switching Properties of Metalloporphyrin Molecules on Metal Surfaces
… hybridization, thus giving rise to a new Kondo peak at the Fermi energy. The repulsive interaction between Cl- terminated tips and FeOEP molecules changes the molecular spin state (oxidation state) from S = 1 (+2) into S = 5/2 (+3), indicated by the Kondo resonance in differential …
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Field theoretical methods for strongly correlated electron systems
… regime, in which the magnetic impurity is effectively decoupled from the quasi-particles, to a strong coupling phase which exhibits a Ill Kondo effect and the magnetic impurities are screened. The ground state is a singlet. If the system has particle-hole symmetry the impurity appears to be …
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Quantum Materials based on the Kagome Lattice
… advancements – for example, the discovery of Kondo effect in impurity spin systems led to the development of renormalization group theory – but also hold great promise for the next generation of quantum technologies – for instance, the discovery of topological insulators opens up the …
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