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TT: Fachverband Tiefe Temperaturen

TT 35: Topology: Poster

TT 35.7: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P3

Impact of decoherence on the Kitaev honeycomb model — •Alexander Sattler and Maria Daghofer — Universität Stuttgart, 70550 Stuttgart, Germany

Quantum spin liquids (QSL) are phases of matter with unique properties, including quantum fluctuations, frustration, entanglement, fractionalized excitations, and the absence of long-range order. A rare example of an exactly solvable, strongly interacting two-dimensional model with a QSL ground state is the Kitaev honeycomb model (KHM). This model describes spin-1/2 particles on a honeycomb lattice with direction-dependent Ising-like interactions. The KHM with open boundaries supports edge-localized Majorana zero modes that are robust to certain types of disorder. Quantum systems are inherently coupled to their environment, necessitating the study of the KHM properties in open systems, where environmental interactions, such as decoherence, can influence their features. To study this, we analyze the KHM in a cylindrical geometry while modeling environmental coupling using the Lindblad master equation to simulate decoherence. By examining changes in the dispersion relation, entropy, fidelity, purity and spectral gap over time, we evaluate how environmental interactions affect the properties of the KHM.

Keywords: Kitaev honeycomb model; Lindblad master equation; Open quantum systems; Decoherence; Topology