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Topic: Kondo effect

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	Kondo effect - Wikipedia, the free encyclopedia
		The Kondo effect is the first known example of asymptotic freedom in physics, in which the coupling becomes non-perturbatively strong at low temperatures/low energies.
		Extended to a lattice of magnetic impurities, the Kondo effect is believed to underly the formation of heavy fermions in intermetallic compounds based upon especially rare earth elements like cerium, praseodymium, and ytterbium, and actinide elements like uranium.
		More recently, it is believed that a manifestation of the Kondo effect is necessary for understanding the unusual metallic delta-phase of plutonium.
	en.wikipedia.org /wiki/Kondo_effect (383 words)

	Kondo - Wikipedia, the free encyclopedia
		Jun Kondo, physicist, researcher of the Kondo effect
		Kondo was the former name of Behanzin, King of Dahomey (now Benin), Africa
		In physics, the Kondo effect regards the presence of a magnetic impurity in a solid.
	en.wikipedia.org /wiki/Kondo (123 words)

	KITP Condensed Matter Theory: Gregory (Greg) A. Fiete (Site not responding. Last check: 2007-10-12)
		We study quantum effects in a spin-3/2 antiferromagnet on the pyrochlore lattice in an external magnetic field, focusing on the vicinity of a plateau in the magnetization at half the saturation value, observed in CdCr$_2$O$_4$, and HgCr$_2$O$_4$.
		The theory includes the effects of incoherent surface state electron scattering at the impurities and quantitively describes all of the current STM data on quantum corrals, including the recent quantum mirage experiments with Kondo effect.
		The calculated Kondo coupling is inversely proportional to the total spin of the ferromagnetic cluster in both models and thus the Kondo temperature is rapidly suppressed as the size of the cluster increases.
	theory.kitp.ucsb.edu /~fiete (2999 words)

	Kondo-Effekt - Wikipedia
		Jun Kondo konnte 1964 (Progress of Theoretical Physics, Vol.
		Der Poor man's scaling Ansatz von Anderson war zunächst eine Hypothese und wurde erst von (K.G. Wilson, 1974) durch Numerische Renormierungsgruppen verifiziert.
		Kondo Effekt - 40 Jahre nach der Entdeckung - Sonderausgabe des Journals der Japanische Physikalische Gesellschaft - auf Englisch
	de.wikipedia.org /wiki/Kondo-Effect (225 words)

	Nat' Academies Press, Condensed-Matter and Materials Physics: Basic Research for Tomorrow's Technology (1999)
		Kondo behavior was found recently in a single-electron transistor, which consists of a semiconductor quantum dot sandwiched between two metallic leads.
		The concept of the Kondo effect is intriguing because it involves the pairing of a localized electron with an electron in an extended state in the metal.
		Although interactions between electrons in quantum dots are known to be important, the Kondo phenomenon is a true many-body effect requiring a coherent state resulting from the coupling of the localized electrons in the dot and a continuum of electron states outside the dot.
	www.nap.edu /books/0309063493/html/50.html (824 words)

	PASPS III Conference: Poster Session
		We study the Kondo effect in a quantum dot (QD), which is coupled to ferromagnetic leads, and analyze its properties.
		The value of the Kondo temperature decreases with increase of the spin polarization and is suppressed to zero for the full spin-polarized system.
		We show that the Kondo effect in the presence of ferromagnetic leads has unique properties such as a strong spin polarization of the density of states (DOS) at the Fermi level.
	www.sainc.com /pasps3/agendaposterView.asp?paperID=92 (436 words)

	[No title]
		The main goal of the seminar series is to discuss the Kondo effect that appears in various quantum dot devices.
		The Kondo effect takes place when there are spin exchange interactions between a local magnetic moment and conduction electrons.
		It is shown that the Kondo effect depends on the phase of hopping amplitude between the quantum dot and the ring while its magnitude remains unchanged.
	www.uni-regensburg.de /Fakultaeten/nat_Fak_II/forschung/cuniberti/pages/seminar_77_print.html (416 words)

	Kondo effect (Site not responding. Last check: 2007-10-12)
		It was found thatthe resistance of a metal with these impurities does notdecrease to a constant at low temperatures (as for a metal with non-magneticimpurities), but actually hits a shallow minimum at a temperature of order 10 K, thenincreases at lower temperatures.
		Kondo did the first proper calculation regarding this effect, which showed that in higher ordersof perturbationtheory, the resistance will diverge as the temperature approaches 0 K. Later calculations refined this result to produce afinite resistivity but retained the feature of a resistance minimum at a non-zero temperature.
		The Anderson model and accompanying renormalization theory was an important contribution to understanding theunderlying physics of the problem.
	www.therfcc.org /kondo-effect-24227.html (161 words)

	Kondo, Nobutaki - Hutchinson encyclopedia article about Kondo, Nobutaki (Site not responding. Last check: 2007-10-12)
		Kondo was the commander of the Southern Sea Force which sank the British battleships Prince of Wales and Repulse off the coast of Malaya 10 December 1941.
		He took part in the Battle of Midway 1942, though he withdrew without engaging the US fleet, and was also involved in the naval battles off Guadalcanal and in the Battle of the Eastern Solomons.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /Kondo%2c+Nobutaki (123 words)

	ScienceWeek
		In the absence of the Kondo coupling, the conductance of a SET at zero drain-source bias (Vds = 0) is very small, except for values of the gate voltage at which two charge states of the quantum dot are degenerate.
		The "Kondo effect" is a large anomalous increase in the resistance of certain dilute alloys of magnetic materials in nonmagnetic hosts as the temperature is lowered.
		In general, the Kondo effect occurs when an impurity atom with an unpaired electron is placed in a metal, producing an interaction of localized electrons with delocalized electrons.
	www.scienceweek.com /2004/sc040723-2.htm (1205 words)

	Institut Mediterrani d'Estudis Avançats - Seminario
		The conventional Kondo effect takes place when an electron spin 1/2 is localized in quantum dots due to the Coulomb blockade and coupled to the Fermi sea in the leads.
		A significant enhancement of the conductance to 2e2/h is observed by the Kondo effect.
		For an odd number of electrons, a large Kondo effect is expected which stems from the interplay between spin and orbital degrees of freedom [SU(4) Kondo effect].
	www.imedea.uib.es /public/showseminar_es.php?indice=290 (239 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		One signature of spin effects in condensed matter in general is the Kondo effect, where an isolated spin is correlated with a surrounding electron cloud of opposite spin.
		The Kondo effect in a quantum ring is a periodic function of magnetic field.
		The reason for this observation is the fact that the Kondo temperature is an exponential function of the interaction strength as well as of the ring-lead coupling.
	www.nanophys.ethz.ch /research/r1.php (440 words)

	Orbital and spin Kondo effects in a double quantum dot
		Motivated by recent experiments, in which the Kondo effect has been observed for the first time in a double quantum dot structure, we study electron transport through a system consisting of two ultrasmall, capacitively coupled dots with large level spacing and charging energy.
		Due to strong interdot Coulomb correlations, the Kondo effect has two possible sources, the spin and orbital degeneracies, and it is maximized when both occur simultaneously.
		The large number of tunable parameters allows a range of manipulations of the Kondo physics -in particular, the Kondo effect in each dot is sensitive to changes in the state of the other dot.
	www.edpsciences.org /articles/epl/abs/2001/08/6491/6491.html (221 words)

	'Quantum dots' could form basis of new computers
		We demonstrate a Kondo effect in a series-coupled double quantum dot.
		When the many body molecular states are formed, we observe a splitting of the Kondo resonance peak in the differential conductance.
		The occurrence of the Kondo resonance and its magnetic field dependence agree with a simple interpretation of the spin status of a double quantum dot.
	www.eurekalert.org /pub_releases/2001-09/pu-dc091701.php (1062 words)

	Magneto-Transport Investigation on Multi-Electron Quantum Dots: Coulomb Blockade, Kondo Effect, and Fano Regime (Site not responding. Last check: 2007-10-12)
		The Kondo effect is found to be modulated by the addition of single magnetic flux quanta to the quantum dot.
		In contrast to previous studies we observe a Kondo effect in high- as well as in low-conductance tiles of the chessboard-like magneto-conductance.
		The structure of the Kondo effect in this regime is more complicated than expected for a single unpaired electron with spin 1/2, demonstrating that the electronic state of the dot is governed by many-particle correlations.
	www.nano.uni-hannover.de /dissertationen/abs-fuehner.html (760 words)

	Kondo effect (Site not responding. Last check: 2007-10-12)
		It was found that the resistance of a metal with these impurities not decrease to a constant at low temperatures (as for a metal with non-magnetic but actually hits a shallow minimum at temperature of order 10 K then increases at lower temperatures.
		Kondo the first proper calculation regarding this effect showed that in higher orders of perturbation theory the resistance will diverge as the approaches 0 K. Later calculations refined this to produce a finite resistivity but retained feature of a resistance minimum at a temperature.
		The Anderson model and accompanying renormalization theory was an important contribution to the underlying physics of the problem.
	www.freeglossary.com /Kondo_effect (348 words)

	Kondo effect - TheBestLinks.com - Kelvin, Metal, Temperature, Electrical resistance, ... (Site not responding. Last check: 2007-10-12)
		Kondo effect - TheBestLinks.com - Kelvin, Metal, Temperature, Electrical resistance,...
		Kondo effect, Kelvin, Metal, Temperature, Electrical resistance, Magnetic...
		Kondo did the first proper calculation regarding this effect, which showed that in higher orders of perturbation theory, the resistance will diverge as the temperature approaches 0 K. Later calculations refined this result to produce a finite resistivity but retained the feature of a resistance minimum at a non-zero temperature.
	www.thebestlinks.com /Kondo_effect.html (217 words)

	Ramon Aguado-Mesoscopic Physics-Quantum Dots
		Kondo effect in quantum dots and related quantum impurity problems.
		Kondo effect in coupled quantum dots: A noncrossing approximation study
		Kondo effect in AC transport through quantum dots,
	www.icmm.csic.es /raguado (171 words)

	A local view of the Kondo effect: Scanning tunneling spectroscopy (Site not responding. Last check: 2007-10-12)
		The fascinating many-body physics involved in the interaction of a single magnetic impurity with the conduction electrons of its nonmagnetic metallic host is reflected in unconventional phenomena in magnetism, transport properties and the specific heat.
		Characteristic low-energy excitations, termed the Kondo resonance, are generally believed to be responsible for this striking behaviour.
		In particular, the observed Fano lineshape of the Kondo resonance reveals unambiguously the details of the quantum mechanical interference between the localized orbital and the conduction electrons on an atomic length scale [1, 2].
	www.iisc.ernet.in /pramana/june1999/article0.htm (302 words)

	Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field
		Kondo effect and singlet-triplet splitting in coupled quantum dots in a magnetic field
		We study the interplay between Kondo correlations and the singlet-triplet exchange splitting K between the two spins in a double quantum dot.
		We calculate the cotunneling current with elastic and inelastic contributions and its renormalization due to Kondo correlations, away and at the degeneracy point K=0.
	www.edpsciences.org /articles/epl/abs/2003/07/7552/7552.html (192 words)

	PASPS III Conference: Conference Session
		In particular, one might ask to what extent the Kondo effect in QD`s is sensitive to the presence of ferromagnetic leads or spin flip processes.
		By investigating the nonequilibrum transport properties of a QD in the strongly interacting limit, we predict a splitting of the differential conductance when the spin flip scattering amplitude is of the order of the Kondo temperature [1].
		Furthermore, we present a numerical renormalization group analysis showing that the Kondo effect survives for nonzero lead polarizations in the regime where charge fluctuations are negligible [2].
	www.sainc.com /pasps3/agendaConferenceView.asp?paperID=68 (172 words)

	Nuova pagina 1 (Site not responding. Last check: 2007-10-12)
		In the case we have studied: spin 1/2 survives at the dot with no unpaired electron because there are an even number of e- on the dot.
		We have proposed to detect two-channel spin-1/2 orbital Kondo effect in a quantum dot at Coulomb Blockade, with an odd number of electrons.
		We have proved that the antiferromagnetic spin interaction between the dot and the conduction electrons may give raise to two-channel spin-1/2 Kondo effect.
	people.na.infn.it /~arturo/group/kondo.html (219 words)

	Seminars - MPI and University, Detail id=1093 (Site not responding. Last check: 2007-10-12)
		Recent spectacular developments in microprobe technology, such as scanning tunneling microscopy or point contact spectroscopy, have opened up the possibility to investigate in detail the Kondo effect of a single magnetic ion embedded in a metallic host.
		We discuss different experimental setups, where Kondo correlations are influenced, suppressed or even generated, by spatial restrictions on the metallic host.
		Examples are a Kondo ion in a metallic quantum box with discrete conduction levels or a Kondo ion on a metal surface probed by STM spectroscopy.
	www.mpi-halle.mpg.de /seminar/seminar1.php3?detail=1093&Seminar_Session=5ec98a624dcb8eb0ab903a1e33d443e3 (135 words)

	[No title] (Site not responding. Last check: 2007-10-12)
		We study the Kondo effect in quantum dots (QDs) - artificial magnetic impurities - attached to ferromagnetic leads, using the numerical renormalization group method.
		We show that the QD level is spin-split due to presence of ferromagnetic electrodes, leading to a suppression of the Kondo effect.
		Although the resulting Kondo resonance then has an unusual spin asymmetry with a reduced Kondo temperature, the ground state is still a locally-screened state, describable by Fermi liquid theory and a generalized Friedel sum rule, and transport in the unitary limit is not spin dependent.
	www.ill.fr /Events/SEMINAR/Archives/SEMTH10Dec2004.html (248 words)

	ScienceWeek
		1) Gate-confined quantum dots have emerged as important systems for the study of the Kondo effect, a subtle many-electron effect in which conduction electrons in the vicinity of a spin impurity screen the spin to form a collective entangled ground state at low temperatures (1).
		The connection between Kondo physics and quantum dots is most evident when an odd number of electrons confined within the dot act as a single spin coupled to electron reservoirs (2-5).
		The simplest system exhibiting the richness of this competition, the two-impurity Kondo system, was realized experimentally by the authors in the form of two quantum dots coupled through an open conducting region.
	www.scienceweek.com /2004/sc040709-3.htm (1011 words)

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