24 citations · 178 across the 16 of their papers we have counts for
17 papers
Quantum transport across normal-superlattice-normal graphene junctions: Fabry-Pérot interference, Hofstadter butterfly, and supersnake states
Che-Pin Hsu, Alina Mreńca-Kolasińska, Aitor Garcia-Ruiz +4
Electrostatic modulation of graphene provides a tunable route to engineering miniband structures. We perform quantum transport simulations on a gate-defined graphene superlattice j…
Anisotropic transport in ballistic bilayer graphene cavities
Florian Schoeppl, Alina Mrenca-Kolasinska, Ming-Hao Liu +3
Closing the gap between ray tracing simulations and experimentally observed electron jetting in bilayer graphene (BLG), we study all-electronic, gate-defined BLG cavities using tig…
Quantum capacitive coupling between large-angle twisted graphene layers
Alina Mrenca-Kolasinska, Peter Rickhaus, Giulia Zheng +4
Large-angle twisted bilayer graphene (tBLG) is known to be electronically decoupled due to the spatial separation of the Dirac cones corresponding to individual graphene layers in…
Finite difference method for Dirac electrons in circular quantum dots
B. Szafran, A. Mrenca-Kolasinska, D. Zebrowski
A simple and reliable finite difference approach is presented for solution of the Dirac equation eigenproblem for states confined in rotationally symmetric systems. The method sets…
Imaging spin-resolved cyclotron trajectories in the InSb two-dimensional electron gas
Alina Mrenca-Kolasinska, Krzysztof Kolasinski, Bartłomiej Szafran
We consider spin-resolved cyclotron trajectories in a magnetic focusing device with quantum point source and drain contacts defined within the InSb two-dimensional electron gas and…
Spin-active devices based on graphene / WSe heterostructure
Alina Mrenca-Kolasinska, Bartlomiej Rzeszotarski, Bartlomiej Szafran
We consider graphene on monolayer WSe and the spin-orbit coupling induced by the transition-metal dichalcogenide substrate for application to spin-active devices. We study quan…
Electrostatic quantum dots in silicene
B. Szafran, D. Zebrowski, A. Mrenca-Kolasinska
We study electrostatic quantum dot confinement for charge carriers in silicene. The confinement is formed by vertical electric field surrounding the quantum dot area. The resulting…
Electrical control of a confined electron spin in a silicene quantum dot
Bartlomiej Szafran, Alina Mrenca-Kolasinska, Bartlomiej Rzeszotarski +1
We study spin control for an electron confined in a flake of silicene. We find that the lowest-energy conduction-band levels are split by the diagonal intrinsic spin-orbit coupling…
Aharonov-Bohm conductance oscillations and current equilibration in local n - p junctions in graphene
Dariusz Żebrowski, Alina Mrenca-Kolasinska, Bartłomiej Szafran
We consider a small p-type island defined within n-type graphene nanoribbon induced by potential of a floating electrode. In the quantum Hall conditions the island supports persist…
Spin inversion in fluorinated graphene n-p junction
Bartlomiej Rzeszotarski, Alina Mrenca-Kolasinska, Bartlomiej Szafran
We consider a dilute fluorinated graphene nanoribbon as a spin-active element. The fluorine adatoms introduce a local spin-orbit Rashba interaction that induces spin-precession for…
Imaging backscattering in graphene quantum point contacts
Alina Mreńca-Kolasińska, Bartłomiej Szafran
We study graphene quantum point contacts (QPC) and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We consider both etch…
Lorentz force effects for graphene Aharonov-Bohm interferometers
Alina Mrenca-Kolasinska, Bartlomiej Szafran
We investigate magnetic deflection of currents that flow across the Aharonov-Bohm interferom- eters defined in graphene. We consider devices induced by closed n-p junctions in nano…
Imaging snake orbits at graphene n-p junctions
K. Kolasiński, A. Mreńca-Kolasińska, B. Szafran
We consider conductance mapping of the snake-orbits confined along the n-p junction defined in graphene by the electrostatic doping in the quantum Hall regime. We explain the perio…
Inter-Edge Backscattering in Buried Split-Gate-Defined Graphene Quantum Point Contacts
Shaohua Xiang, Alina Mrenca-Kolasinska, Vaidotas Miseikis +7
Quantum Hall effects offer a formidable playground for the investigation of quantum transport phenomena. Edge modes can be detected, branched, and mixed by designing a suitable pot…
Theory of ballistic quantum transport in presence of localized defects
K. Kolasiński, A. Mreńca-Kolasińska, B. Szafran
We present an efficient numerical approach for treating ballistic quantum transport across devices described by tight binding (TB) Hamiltonians designated to systems with localized…
Aharonov-Bohm interferometer based on n-p junction in graphene nanoribbons
Alina Mreńca-Kolasińska, Stefan Heun, Bartłomiej Szafran
We demonstrate that the phenomenon of current confinement along graphene n-p junctions at high magnetic fields can be used to form an Aharonov-Bohm interferometer. The interference…
Transconductance and effective Landé factors for quantum point contacts: spin-orbit coupling and interaction effects
K. Kolasiński, A. Mreńca-Kolasińska, B. Szafran
We analyze the effective factors and their dependence on the orientation of the external magnetic field for a quantum point contact defined in the two-dimensional electron ga…