SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: 1D Theory

TT 45.3: Vortrag

Donnerstag, 30. März 2023, 10:00–10:15, HSZ 103

Dominant superconducting correlations in a Luttinger liquid induced by spin fluctuations — •Niels Henrik Aase and Asle Sudbø — Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway

In the last decades, heterostructures of magnetic materials and various conductors have received much attention. Several studies have focused on the emergent interfacial phenomena and their possible application in spintronic devices. Motivated by this, we study the simplest equivalent heterostructure in one dimension: an interacting metallic chain coupled to a spin chain. Confining interacting electrons to one dimension causes the breakdown of Fermi liquid theory, so our study provides insight into how spin fluctuations can induce superconductivity in a strongly correlated non-Fermi liquid with repulsive electronic interactions only.

Treating the system using bosonization, we calculate the correlation functions of the electrons in the metal. Based on the non-universal power-law decay of different order parameters, we outline the electron phase diagram as a function of the interchain coupling and the interactions in the metal. The coupling favors triplet pairing, suggesting that the metal chain can sustain a spin-polarized supercurrent. In some parameter regimes, the superconducting triplet correlations persist in the case of repulsive interactions in the metal. The spin chain is thus an essential ingredient for overcoming electron repulsion in a Luttinger liquid.