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cond-mat.stat-mech2026
Quantum phase transition in transverse-field Ising model on Sierpiński gasket lattice
Tymoteusz Braciszewski, Oliwier Urbański, Piotr Tomczak
We investigate the quantum phase transition in the transverse-field Ising model on the Sierpiński gasket using finite-size scaling (FSS) and numerical renormalization group (NRG).…
cond-mat.stat-mech2025
Exploring the variational method for thermodynamic models
Oliwier Urbański
This work explores the possibilities of the Gibbs-Bogoliubov-Feynman variational method, aiming at finding room for designing various drawing schemes. For example, mean-field appro…