SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 47: Quantum-Critical Phenomena
TT 47.5: Vortrag
Donnerstag, 30. März 2023, 10:30–10:45, HSZ 204
Marginal Fermi liquid at a magnetic quantum critical point from dimensional confinement — •Bernhard Frank1, Zi Hong Liu2, Fakher F. Assaad2, Matthias Vojta1, and Lukas Janssen1 — 1Institut für Theoretische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, 01062 Dresden, Germany — 2Institut für Theoretische Physik und Astrophysik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, 97074 Würzburg, Germany
Metallic quantum criticality is frequently discussed as a source for non-Fermi liquid behavior, but controlled theoretical treatments are scarce. Here, we identify and study a novel magnetic quantum critical point in a two-dimensional antiferromagnet coupled to a three-dimensional environment of conduction electrons. By combining an effective field theory analysis and sign-problem-free quantum Monte Carlo simulations, we demonstrate that the quantum critical point exhibits marginal Fermi liquid behavior. In particular, we compute the electrical resistivity for transport across the magnetic layer, which is shown to display a linear temperature dependence at criticality. Experimental realizations in Kondo heterostructures are discussed.