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キーワード:
Intelligent systems, Monte Carlo methods, Characteristic length, Confinement effects, Non-magnetic impurities, Quantum Monte Carlo simulations, Quantum spin ladders, Scale-free, Scalings, Spin ladders, Tetrabromocuprate, Tomonaga Luttinger liquid, article, simulation, Neutron scattering
要旨:
Using a combination of neutron scattering, calorimetry, quantum Monte Carlo simulations, and analytic results we uncover confinement effects in depleted, partially magnetized quantum spin ladders. We show that introducing nonmagnetic impurities into magnetized spin ladders leads to the emergence of a new characteristic length L in the otherwise scale-free Tomonaga-Luttinger liquid (serving as the effective low-energy model). This results in universal LT scaling of staggered susceptibilities. Comparison of simulation results with experimental phase diagrams of prototypical spin ladder compounds bis(2,3-dimethylpyridinium)tetrabromocuprate(II) (DIMPY) and bis(piperidinium)tetrabromocuprate(II) (BPCB) yields excellent agreement. © 2022 authors. Published by the American Physical Society.
