Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.9: Vortrag
Dienstag, 18. März 2025, 11:45–12:00, H32
Hidden antiferromagnetism and pseudogap from fluctuating stripes — •Henning Schlömer1, Annabelle Bohrdt2, and Fabian Grusdt1 — 1Department of Physics, Ludwig-Maximilians-Universität München, Theresienstr. 37, 80333 — 2University of Regensburg, Universitätsstr. 31, 93053 Regensburg
One of the central mysteries of hole-doped cuprates is the pseudogap phase, whose unusual properties are believed to be essential for understanding high-temperature superconductivity. While a broad variety of theoretical proposals have been put forward in the past decades, a unified view connecting the pseudogap to other observed phases, like antiferromagnetic (AFM) and stripe phases, has remained elusive. In this talk, I will propose a scenario in which the the AFM, stripe, and pseudogap phases all share a common origin: The spins in the material form an ordered AFM background, on top of which fluctuating domain walls exist that can obscure long-range order. I will argue that these fluctuating domain walls are at the heart of the pseudogap phase: They hide magnetic order in real space, leaving only short-range AFM correlations detectable in experiments. Furthermore, these fluctuations can give rise to a topological phase (an odd Z2 spin liquid) that supports a small Fermi surface, consistent with experimental data. At a (hidden) quantum critical point, hidden AFM order fully dissolves, restoring spin symmetry without a divergent correlation length.
Keywords: Pseudogap; Fractionalized Fermi liquid; Z2 spin liquid; Toric code; Cuprates