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pro vyhledávání: '"Halbinger, Johannes"'
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
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. 15.5.183 (2023)
In the field of quantum many-body physics, the spectral (or Lehmann) representation simplifies the calculation of Matsubara n-point correlation functions if the eigensystem of a Hamiltonian is known. It is expressed via a universal kernel function an
Externí odkaz:
http://arxiv.org/abs/2304.03774
Autor:
Halbinger, Johannes, Punk, Matthias
Publikováno v:
Phys. Rev. B 103, 235157 (2021)
We study spin density wave quantum critical points in two dimensional metals with a quenched disorder potential coupling to the electron density. Adopting an $\epsilon$-expansion around three spatial dimensions, where both disorder and the Yukawa-typ
Externí odkaz:
http://arxiv.org/abs/2103.06295
Publikováno v:
Phys. Rev. B 99, 195102 (2019)
We revisit the problem of two dimensional metals in the vicinity of a quantum phase transition to incommensurate $\mathbf{Q}=2k_F$ charge density wave order, where the order parameter wave vector $\mathbf{Q}$ connects two hot spots on the Fermi surfa
Externí odkaz:
http://arxiv.org/abs/1902.05084
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