33 citations · 91 across the 10 of their papers we have counts for
10 papers
Two-site reduced density matrix from one- and two-particle Green's functions
Gergő Roósz, Anna Kauch, Frederic Bippus +2
Strongly correlated electron systems are challenging to calculate, and entanglement in such systems is not widely analyzed. We present an approach that can be used as a post-proces…
Reducing defect production in random transverse-field Ising chains by inhomogeneous driving fields
R. Juhász, G. Roósz
In transverse-field Ising models, disorder in the couplings gives rise to a drastic reduction of the critical energy gap and, accordingly, to an unfavorable, slower-than-algebraic…
Front dynamics in the Harper model
Gergo Roosz
The front dynamics in the Harper (or Aubry-André) model (which has a localization transition) is investigated using two different settings, particle number front where the system i…
Interacting Majorana modes at surfaces of noncentrosymmetric superconductors
Janna E. Rückert, Gergő Roósz, Carsten Timm
Noncentrosymmetric superconductors with line nodes are expected to possess topologically protected flat zero-energy bands of surface states, which can be described as Majorana mode…
Entanglement entropy of random partitioning
Gergö Roósz, István A. Kovács, Ferenc Iglói
We study the entanglement entropy of random partitions in one- and two-dimensional critical fermionic systems. In an infinite system we consider a finite, connected (hypercubic) do…
Quantum relaxation and metastability of lattice bosons with cavity-induced long-range interactions
Benjamin Blaß, Heiko Rieger, Gergö Roósz +1
The coupling of cold atoms to the radiation field within a high-finesse optical resonator, an optical cavity, induces long-range interactions which can compete with an underlying o…
Entanglement between random and clean quantum spin chains
Robert Juhász, István A. Kovács, Gergő Roósz +1
The entanglement entropy in clean, as well as in random quantum spin chains has a logarithmic size-dependence at the critical point. Here, we study the entanglement of composite sy…
Critical quench dynamics of random quantum spin chains: Ultra-slow relaxation from initial order and delayed ordering from initial disorder
Gergo Roosz, Yu-Cheng Lin, Ferenc Igloi
By means of free fermionic techniques combined with multiple precision arithmetic we study the time evolution of the average magnetization, , of the random transve…
Evolution of the magnetization after a local quench in the critical transverse-field Ising chain
F. Iglói, G. Roósz, L. Turban
We study the time evolution of the local magnetization in the critical Ising chain in a transverse field after a sudden change of the parameters at a defect. The relaxation of the…
Nonequilibrium quench dynamics in quantum quasicrystals
Ferenc Igloi, Gergo Roosz, Yu-Cheng Lin
We study the nonequilibrium dynamics of a quasiperiodic quantum Ising chain after a sudden change in the strength of the transverse field at zero temperature. In particular we cons…