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pro vyhledávání: '"von Delft A"'
The transport across a Kondo-correlated quantum dot coupled to two leads with independent temperatures and chemical potentials is studied using a controlled non-perturbative, and in this sense exact numeric treatment based on a hybrid numerical renor
Externí odkaz:
http://arxiv.org/abs/2409.03102
Autor:
Fernández, Yuriel Núñez, Ritter, Marc K., Jeannin, Matthieu, Li, Jheng-Wei, Kloss, Thomas, Louvet, Thibaud, Terasaki, Satoshi, Parcollet, Olivier, von Delft, Jan, Shinaoka, Hiroshi, Waintal, Xavier
The tensor cross interpolation (TCI) algorithm is a rank-revealing algorithm for decomposing low-rank, high-dimensional tensors into tensor trains/matrix product states (MPS). TCI learns a compact MPS representation of the entire object from a tiny t
Externí odkaz:
http://arxiv.org/abs/2407.02454
Autor:
Ritz, Nepomuk, Ge, Anxiang, Walter, Elias, Aguirre, Santiago, von Delft, Jan, Kugler, Fabian B.
We provide a detailed exposition of our computational framework designed for the accurate calculation of real-frequency dynamical correlation functions of the single-impurity Anderson model (AM) in the regime of weak to intermediate coupling. Using q
Externí odkaz:
http://arxiv.org/abs/2405.20996
We study dynamical scaling associated with a Kondo-breakdown quantum critical point (KB-QCP) of the periodic Anderson model, treated by two-site cellular dynamical mean-field theory (2CDMFT). In the quantum critical region, the staggered spin exhibit
Externí odkaz:
http://arxiv.org/abs/2404.14079
Autor:
Dirnböck, Selina, Lee, Seung-Sup B., Kugler, Fabian B., Huber, Sebastian, von Delft, Jan, Held, Karsten, Wallerberger, Markus
Two-particle response functions are a centerpiece of both experimental and theoretical quantum many-body physics. Yet, due to their size and discontinuity structure, they are challenging to handle numerically. Recently, two advances were made to tack
Externí odkaz:
http://arxiv.org/abs/2404.05541
Conceptually, the Matsubara formalism (MF), using imaginary frequencies, and the Keldysh formalism (KF), formulated in real frequencies, give equivalent results for systems in thermal equilibrium. The MF has less complexity and is thus more convenien
Externí odkaz:
http://arxiv.org/abs/2311.11389
We study paramagnetic quantum criticality in the periodic Anderson model (PAM) using cellular dynamical mean-field theory, with the numerical renormalization group (NRG) as an impurity solver. The PAM describes an itinerant $c$ band hybridizing with
Externí odkaz:
http://arxiv.org/abs/2310.12672
Autor:
Lihm, Jae-Mo, Halbinger, Johannes, Shim, Jeongmin, von Delft, Jan, Kugler, Fabian B., Lee, Seung-Sup B.
Publikováno v:
Phys. Rev. B 109, 125138 (2024)
Multipoint vertex functions, and the four-point vertex in particular, are crucial ingredients in many-body theory. Recent years have seen significant algorithmic progress toward numerically computing their dependence on multiple frequency arguments.
Externí odkaz:
http://arxiv.org/abs/2310.12098
Publikováno v:
SciPost Phys. Codebases 24 (2024)
The Matsubara Green's function formalism stands as a powerful technique for computing the thermodynamic characteristics of interacting quantum many-particle systems at finite temperatures. In this manuscript, our focus centers on introducing Matsubar
Externí odkaz:
http://arxiv.org/abs/2309.12511
The two-dimensional (2D) Hubbard model is widely believed to capture key ingredients of high-$T_c$ superconductivity in cuprate materials. However, compelling evidence remains elusive. In particular, various magnetic orders may emerge as strong compe
Externí odkaz:
http://arxiv.org/abs/2307.14835