Universität zu Köln

Mitchell, Andrew K., Galpin, Martin R., Wilson-Fletcher, Samuel, Logan, David E. and Bulla, Ralf (2014). Generalized Wilson chain for solving multichannel quantum impurity problems. Phys. Rev. B, 89 (12). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

The numerical renormalization group is used to solve quantum impurity problems, which describe magnetic impurities in metals, nanodevices, and correlated materials within dynamical mean field theory. Here we present a simple generalization of the Wilson chain, which improves the scaling of computational cost with the number of conduction bands, bringing more complex problems within reach. The method is applied to calculate the t matrix of the three-channel Kondo model at T = 0, which shows universal crossovers near non-Fermi-liquid critical points. A nonintegrable three-impurity problem with three bands is also studied, revealing a rich phase diagram and novel screening and overscreening mechanisms.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mitchell, Andrew K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Galpin, Martin R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wilson-Fletcher, Samuel UNSPECIFIED UNSPECIFIED UNSPECIFIED Logan, David E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bulla, Ralf UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-443449
DOI:	10.1103/PhysRevB.89.121105
Journal or Publication Title:	Phys. Rev. B
Volume:	89
Number:	12
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute for Theoretical Physics
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RENORMALIZATION-GROUP METHOD; KONDO PROBLEM; FIELD-THEORY; INFINITE DIMENSIONS; HEAVY FERMIONS; SYSTEMS; MODEL; HAMILTONIANS; TRANSITIONS; TRANSISTOR Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/44344