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Quantum Phase Transition of Many Interacting Spins Coupled to a Bosonic Bath: static and dynamical properties
G. De Filippis, A. de Candia, A. S. Mishchenko +7
By using worldline and diagrammatic quantum Monte Carlo techniques, matrix product state and a variational approach à la Feynman, we investigate the equilibrium properties and rela…
Spontaneous symmetry breaking of domain walls in phase-competing regions
Hiroaki Ishizuka, Yasusada Yamada, Naoto Nagaosa
We study the nature of domain walls in an ordered phase in the phase-competing region of two Ising-type order parameters. Considering a two-component theory, we show that the…
Theory of Non-Equilibirum States Driven by Constant Electromagnetic Fields: Non-Commutative Quantum Mechanics in the Keldysh Formalism
Shigeki Onoda, Naoyuki Sugimoto, Naoto Nagaosa
We develop a general theory of non-equilibrium states based on the Keldysh formalism, in particular, for charged-particle systems under static uniform electromagnetic fields. The D…
Two-dimensional charge order in layered 2-1-4 perovskite oxides
Shigeki Onoda, Yukitoshi Motome, Naoto Nagaosa
Monte Carlo simulations are performed on the three-dimensional (3D) Ising model with the 2-1-4 layered perovskite structure as a minimal model for checkerboard charge ordering phen…