Zobrazeno 1 - 10
of 1 602
pro vyhledávání: '"Held K"'
Autor:
Adler, S., Fus, D. R., Malcolms, M. O., Vock, A., Held, K., Katanin, A. A., Schäfer, T., Toschi, A.
We investigate the magnetic quantum phase-transitions in bulk correlated metals at the level of dynamical mean-field theory. To this end, we focus on the Hubbard model on a simple cubic lattice as a function of temperature and electronic density, det
Externí odkaz:
http://arxiv.org/abs/2409.04308
Correlated electron systems often show strong bosonic fluctuations, e.g., of antiferromagnetic nature, around a large wave vector such as $\mathbf{q}=(\pi,\pi\ldots)$. These fluctuations can give rise to vertex corrections to the optical conductivity
Externí odkaz:
http://arxiv.org/abs/2402.16104
Autor:
Biało, I., Martinelli, L., De Luca, G., Worm, P., Drewanowski, A., Choi, J., Garcia-Fernandez, M., Agrestini, S., Zhou, Ke-Jin, Kummer, K., Brookes, N. B., Guo, L., Edgeton, A., Eom, C. B., Tomczak, J. M., Held, K., Gibert, M., Wang, Qisi, Chang, J.
Publikováno v:
Commun. Phys. 7, 230 (2024)
Magnetic frustration is a route that can lead to the emergence of novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either the geometry of lattice structures or by incompatible exchange interactions
Externí odkaz:
http://arxiv.org/abs/2306.05828
Publikováno v:
Phys. Rev. Research 5, L022016 (2023)
We investigate the metal-to-insulator phase transition driven by the density-density electronic interaction in the quarter-filled model on a cubic lattice with two orbitals split by a crystal field. We show that a systematic consideration of the non-
Externí odkaz:
http://arxiv.org/abs/2204.02116
Publikováno v:
Phys. Rev. B 103, 205141 (2021)
We compute scattering rates for electrons in the two-dimensional Hubbard model for a one-orbital metal and a two-orbital band insulator by means of the Boltzmann scattering equation (BSE) and dynamical mean-field theory (DMFT). As an intermediate met
Externí odkaz:
http://arxiv.org/abs/2012.11257
Publikováno v:
Phys. Rev. Research 2, 032026 (2020)
Topological spin textures in an itinerant ferromagnet, SrRuO$_3$ is studied combining Hall transport measurements and numerical simulations. We observe characteristic signatures of the Topological Hall Effect associated with skyrmions. A relatively l
Externí odkaz:
http://arxiv.org/abs/2001.07039
Autor:
Katsaros, G., Kukučka, J., Vukušić, L., Watzinger, H., Gao, F., Wang, T., Zhang, J. J., Held, K.
Using inelastic cotunneling spectroscopy, we observe a 55{\mu}eV zero field splitting in the spin triplet manifold of Ge hut wire quantum dots. The degeneracy of the heavy hole triplet state is lifted since the interplay of strong spin orbit coupling
Externí odkaz:
http://arxiv.org/abs/1911.06418
Publikováno v:
Phys. Rev. Lett. 122, 227201 (2019)
We study the phase diagram and quantum critical region of one of the fundamental models for electronic correlations: the periodic Anderson model. Employing the recently developed dynamical vertex approximation, we find a phase transition between a ze
Externí odkaz:
http://arxiv.org/abs/1812.03821
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Publikováno v:
Phys. Rev. B 97, 245136 (2018)
In this work, we analyze in detail the occurrence of divergences in the irreducible vertex functions for one of the fundamental models of many-body physics: the Anderson impurity model (AIM). These divergences -- a surprising hallmark of the breakdow
Externí odkaz:
http://arxiv.org/abs/1712.04171