Lifshitz Tail in the Density of States of a Superconductor with Magnetic Impurities

AbstractWe study discrete random Schrödinger operators via the supersymmetric formalism. We develop a cluster expansion that converges at both strong and weak disorder. We prove the exponential decay of the disorder-averaged Green’s function and the smoothness of the local density of states either at weak disorder and at energies in proximity of the unperturbed spectrum or at strong disorder and at any energy. As an application, we establish Lifshitz-tail-type estimates for the local density of states and thus localization at weak disorder.

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High-Field Behavior of the Density of States of Superconductors with Magnetic Impurities

Low Temperature Physics-LT 13 ◽

10.1007/978-1-4684-2688-5_70 ◽

1974 ◽

pp. 354-358

Author(s):

R. Bruno ◽

Brian B. Schwartz

Keyword(s):

Density Of States ◽

High Field ◽

Magnetic Impurities ◽

Field Behavior

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Ergodicity and dynamical localization for Delone–Anderson operators

Reviews in Mathematical Physics ◽

10.1142/s0129055x15500208 ◽

2015 ◽

Vol 27 (09) ◽

pp. 1550020 ◽

Cited By ~ 6

Author(s):

François Germinet ◽

Peter Müller ◽

Constanza Rojas-Molina

Keyword(s):

Density Of States ◽

Dynamical Localization ◽

Integrated Density Of States ◽

Tail Behavior ◽

Geometric Complexity ◽

Multi Scale ◽

Ergodic Properties ◽

The Family ◽

Delone Sets ◽

Lifshitz Tail

We study the ergodic properties of Delone–Anderson operators, using the framework of randomly colored Delone sets and Delone dynamical systems. In particular, we show the existence of the integrated density of states and, under some assumptions on the geometric complexity of the underlying Delone sets, we obtain information on the almost-sure spectrum of the family of random operators. We then exploit these results to study the Lifshitz-tail behavior of the integrated density of states of a Delone–Anderson operator at the bottom of the spectrum. Furthermore, we use Lifshitz-tail estimates as an input for the multi-scale analysis to prove dynamical localization.

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Effect of Magnetic Impurities on the Density of States of Superconductors

Physical Review ◽

10.1103/physrev.137.a557 ◽

1965 ◽

Vol 137 (2A) ◽

pp. A557-A564 ◽

Cited By ~ 144

Author(s):

Michael A. Woolf ◽

F. Reif

Keyword(s):

Density Of States ◽

Magnetic Impurities

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Tunneling Spectroscopy of Magnetic Impurities (=Mn,Fe,Co) in ZnO

MRS Proceedings ◽

10.1557/proc-1035-l05-26 ◽

2007 ◽

Vol 1035 ◽

Author(s):

Takashi Tamura ◽

Changman Kim ◽

Yasushi Oikawa ◽

Hajime Ozaki

Keyword(s):

Fermi Level ◽

Theoretical Calculation ◽

Conduction Band ◽

Density Of States ◽

Tunneling Spectroscopy ◽

Magnetic Impurities ◽

Electronic Density ◽

Doped Zno ◽

Recent Theoretical Calculation ◽

Co Doped

AbstractThe first observations have been made on the electronic density of states of Mn, Co and Fe-doped ZnO by tunneling spectroscopy. For Mn- and Co-doped ZnO, rising of DOS were observed around 2.8eV and 3.2eV below the bottom of the conduction band, respectively. In these cases, the Fermi level lay at the bottom of the conduction band. For Fe-doped ZnO, the DOS with about 1.2eV width was observed around the Fermi level in the mid-gap. The result reproduced the recent theoretical calculation.

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Enhancement of the Kondo temperature of magnetic impurities in metallic point contacts due to the fluctuations of the local density of states

Physical Review B ◽

10.1103/physrevb.54.7606 ◽

1996 ◽

Vol 54 (11) ◽

pp. 7606-7609 ◽

Cited By ~ 30

Author(s):

G. Zaránd ◽

L. Udvardi

Keyword(s):

Density Of States ◽

Local Density ◽

Kondo Temperature ◽

Magnetic Impurities ◽

Local Density Of States ◽

Point Contacts

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EXCITON BOUND TO MAGNETIC IMPURITIES IN TWO DIMENSION SYSTEMS UNDER STRONG MAGNETIC FIELD

International Journal of Modern Physics B ◽

10.1142/s0217979207043014 ◽

2007 ◽

Vol 21 (08n09) ◽

pp. 1460-1465

Author(s):

PINCHAS DAHAN

Keyword(s):

Magnetic Field ◽

Angular Momentum ◽

Strong Magnetic Field ◽

Density Of States ◽

Dimensional System ◽

Magnetic Impurities ◽

Two Dimensional ◽

Van Hove Singularity ◽

Deep Impurity ◽

Two Dimensional System

The possibility of excitons bound to magnetic impurities in a two-dimensional system quantized by a strong magnetic field is considered. We show that the Landau quantization leads to dramatic changes in the structure of these bound excitons. Such changes are due primarily to a lower symmetry, which lifts the selection rules in the hybridization integrals, and in turn leads to a threshold van Hove singularity of the density of states in a two-dimensional system. Hence, a bound exciton with zero angular momentum, m = 0, is captured by a spin selective potential of the deep impurity levels.

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