5 papers
Effective strings and particles interacting in 3D: the Ising model
J. M. Viana Parente Lopes, José Matos, Joao Penedones
We study how a fluctuating domain wall in three dimensions modifies bulk observables in a gapped phase. We introduce an effective interaction between the wall and the lightest bulk…
Exact nonlinear dynamics of single band metallic systems with dissipation: From optical to dc currents
J. M. Alendouro Pinho, B. Amorim, Yuliy V. Bludov +1
The theory of open quantum systems is one of the most essential tools for the development of quantum technologies. A particular area of interest is in the optical response of solid…
Effective string theory on a torus: the 3d Ising domain wall
David Lima, J. M. Viana Parente Lopes, Jose Matos +1
We use effective string theory (EST) to describe a toroidal 2d domain wall embedded in a 3d torus. In particular, we compute the free energy of the domain wall in an expansion in i…
Tunable Magnetic Order in Chiral Coupled Spin Chains
Rafael D. Soares, J. M. Viana Parente Lopes, Hugo Terças
We obtain the ground-state phase diagram of two spin chains consisting in a set two-level systems asymmetrically coupled to an XX chain through a chiral interaction. The interactio…
Reconciling Kubo and Keldysh Approaches to Fermi-Sea-Dependent Nonequilibrium Observables: Application to Spin Hall Current and Spin-Orbit Torque in Spintronics
Simao M. Joao, Marko D. Petrovic, J. M. Viana Parente Lopes +2
Quantum transport studies of spin-dependent phenomena in solids commonly employ the Kubo or Keldysh formulas for the nonequilibrium density operator in the steady-state linear-resp…