103 citations · 229 across the 12 of their papers we have counts for
12 papers
Floquet topological transitions in 2D Su-Schrieffer-Heeger model: interplay between time reversal symmetry breaking and dimerization
Adrian Pena, Bogdan Ostahie, Cristian Radu
We theoretically study the 2D Su-Schrieffer-Heeger model in the context of Floquet topological insulators (FTIs). FTIs are systems which undergo topological phase transitions, gove…
Multiparticle quantum walk: a dynamical probe of topological many-body excitations
Bogdan Ostahie, Doru Sticlet, Cătălin Paşcu Moca +4
Recent experiments demonstrated that single-particle quantum walks can reveal the topological properties of single-particle states. Here, we generalize this picture to the many-bod…
Spectral analysis, chiral disorder and topological edge states manifestation in open non-Hermitian Su-Schrieffer-Heeger chains
B. Ostahie, A. Aldea
We investigate topological and disorder effects in non-Hermitian systems with chiral symmetry. The system under consideration consists in a finite Su-Schrieffer-Heeger chain to whi…
Edge states mechanism for the anomalous quantum Hall effect in diatomic square lattice
B. Ostahie, M. Nita, A. Aldea
The understanding of the Chern insulator and anomalous quantum Hall effect (AQHE) in terms of chiral edge states in confined systems is the first aim of the paper. The model we use…
Non-Hermitian approach of edge states and quantum transport in a magnetic field
B. Ostahie, M. Nita, A. Aldea
We develop a manifest non-Hermitian approach of spectral and transport properties of two- dimensional mesoscopic systems in strong magnetic field. The finite system to which severa…
Phosphorene confined systems in magnetic field, quantum transport, and superradiance in the quasi-flat band
B. Ostahie, A. Aldea
Spectral and transport properties of electrons in confined phosphorene systems are investigated in a five hopping parameter tight-binding model, using analytical and numerical tech…
Electrical manipulation of the edge states in graphene and the effect on the quantum Hall transport
B. Ostahie, M. Nita, A. Aldea
We investigate new properties of the Dirac electrons in the finite graphene sample under perpendicular magnetic field that emerge when an in-plane electric bias is also applied. Th…
Topological properties of the mesoscopic graphene plaquette: QSHE due to spin imbalance
B. Ostahie, M. Nita, A. Aldea
We study the electronic properties of the confined honeycomb lattice in the presence of the intrinsic spin-orbit (ISO) interaction and perpendicular magnetic field, and report on u…
Spectral and transport properties of the two-dimensional Lieb lattice
M. Niţă, B. Ostahie, A. Aldea
The specific topology of the line centered square lattice (known also as the Lieb lattice) induces remarkable spectral properties as the macroscopically degenerated zero energy fla…
Phase extraction in disordered isospectral shapes
Mugurel Ţolea, Bogdan Ostahie, Marian Niţă +2
The phase of the electronic wave function is not directly measurable but, quite remarkably, it becomes accessible in pairs of isospectral shapes, as recently proposed in the experi…
Persistent charge and spin currents in a 1D ring with Rashba and Dresselhaus spin-orbit interactions by excitation with a terahertz pulse
Marian Nita, Bogdan Ostahie, D. C. Marinescu +2
Persistent, oscillatory charge and spin currents are shown to be driven by a two-component terahertz laser pulse in a one-dimensional mesoscopic ring with Rashba-Dresselhaus spin o…
Nonadiabatic generation of spin currents in a quantum ring with Rashba and Dresselhaus spin-orbit interactions
Marian Nita, D. C. Marinescu, Bogdan Ostahie +2
When subjected to a linearly polarized terahertz pulse, a mesoscopic ring endowed with spin-orbit interaction (SOI) of the Rashba-Dresselhaus type exhibits nonuniform azimuthal cha…