149 citations · 1.2k across the 28 of their papers we have counts for
28 papers
Nagaoka ferromagnetism in semiconductor artificial graphene
Gökhan Öztarhan, Paweł Potasz, A. D. Güçlü
We present the emergence of Nagaoka ferromagnetism in semiconductor-based artificial graphene with realistic Coulomb interaction using high-precision variational and diffusion Mont…
Atomistic theory of moiré Hofstadter's butterfly in magic-angle graphene
Alina Wania Rodrigues, Maciej Bieniek, Paweł Potasz +4
We present here a Hofstadter's butterfly spectrum for the magic angle twisted bilayer graphene obtained using an ab initio based multi-million atom tight-binding model. We incorpor…
Itinerant ferromagnetism in transition metal dichalcogenides moiré superlattices
Pawel Potasz, Nicolás Morales-Durán, Nai Chao Hu +1
Moiré materials are artificial crystals formed at van der Waals heterojunctions that have emerged as a highly tunable platform to realize much of the rich quantum physics of electr…
Magnetism and Quantum Melting in Moiré-Material Wigner Crystals
Nicolás Morales-Durán, Pawel Potasz, Allan H. MacDonald
Recent experiments have established that semiconductor-based moiré materials can host incompressible states at a series of fractional moiré-miniband fillings. These states have bee…
Magnetic properties of moiré quantum dot arrays
Weronika Pasek, Michał Kupczyński, Paweł Potasz
We investigate magnetic properties of quantum dot arrays of moiré triangular superlattices. Starting from a reciprocal space model, we use the projection technique to obtain maxima…
DMRG and Monte Carlo studies of magnetic phases and the phase transition
Bartosz Rzepkowski, Michał Kupczyński, Paweł Potasz +1
The monolayer of has been reported to exhibit the ferromagnetic order, with a Curie temperature of and off-plane easy axis, which has attracted much attenti…
Non-local interactions in moiré Hubbard systems
Nicolás Morales-Durán, Nai Chao Hu, Pawel Potasz +1
Moiré materials formed in two-dimensional semiconductor heterobilayers are quantum simulators of Hubbard-like physics with unprecedented electron-density and interaction-strength t…
Exact Diagonalization for Magic-Angle Twisted Bilayer Graphene
Pawel Potasz, Ming Xie, Allan H. MacDonald
We report on finite-size exact-diagonalization calculations in a Hilbert space defined by the continuum-model flat moiré bands of magic angle twisted bilayer graphene (MATBG). For…
Metal-insulator transition in transition metal dichalcogenide heterobilayer moiré superlattices
Nicolás Morales-Durán, Pawel Potasz, Allan H. MacDonald
Moiré superlattices formed in two-dimensional semiconductor heterobilayers provide a new realization of Hubbard model physics in which the number of electrons per effective atom ca…
Prevalence of oxygen defects in an in-plane anisotropic transition metal dichalcogenide
Ryan Plumadore, Mehmet Baskurt, Justin Boddison-Chouinard +7
Atomic scale defects in semiconductors enable their technological applications and realization of novel quantum states. Using scanning tunneling microscopy and spectroscopy complem…
Interband excitations in the 1D limit of two-band fractional Chern insulators
Błażej Jaworowski, Piotr Kaczmarkiewicz, Paweł Potasz +1
We investigate the stability of the one-dimensional limit of Laughlin-like fractional Chern insulator with respect to the interband interaction. We propose a construction f…
Wigner crystallization in topological flat bands
Błażej Jaworowski, Alev Devrim Güçlü, Piotr Kaczmarkiewicz +3
We study the Wigner crystallization on partially filled topological flat bands. We identify the Wigner crystals by analyzing the cartesian and angular Fourier transform of the pair…
Topological phases in Bi/Sb planar and buckled honeycomb monolayers
N. Nouri, M. Bieniek, M. Brzezinska +5
We investigate topological phases in two-dimensional Bi/Sb honeycomb crystals considering planar, buckled, freestanding and deposited on a substrate structures. We use the multi-or…
Topological phase transitions in Chern insulators within three-band models
P. Potasz, B. Jaworowski, M. Kupczyński +3
We investigate topological phase transitions in Chern insulators within three-band models, focusing on the empty band and lowest band populated by spinless fermions. We consider Li…
Entanglement entropy and entanglement spectrum of BiSb (111) bilayers
M. Brzezińska, M. Bieniek, T. Woźniak +2
We investigate topological properties of BiSb bilayers in the (111) plane using entanglement measures. Electronic structures are studied using multi-orbital tight-bin…
Stability of topological properties of bismuth (111) bilayer
M. Bieniek, T. Wozniak, P. Potasz
We investigate electronic and transport properties of bismuth (111) bilayer in the context of stability of its topological properties against different perturbations. The effects o…
Orbital Magnetization of Quantum Spin Hall Insulator Nanoparticles
P. Potasz, J. Fernandez-Rossier
Both spin and orbital degrees of freedom contribute to the magnetic moment of isolated atoms. However, when inserted in crystals, atomic orbital moments are quenched because of the…
Fractional Chern Insulator phase at the transition between checkerboard and Lieb lattice
Błażej Jaworowski, Paweł Potasz, Andrei Manolescu
The stability of Fractional Chern Insulator (FCI) phase is analysed on the example of checkerboard lattice undergoing a transition into Lieb lattice. The transition is perf…
Disorder induced loss of magnetization in Lieb's graphene quantum dots
B. Jaworowski, P. Potasz, A. Wojs
The stability of the magnetization in Lieb graphene quantum dots (GQD) against disorder is studied. Such systems exhibit the degenerate shell of edge states in the middle of the en…
Zero-energy states of graphene triangular quantum dots in a magnetic field
A. D. Guclu, P. Potasz, P. Hawrylak
We present a tight-binding theory of triangular graphene quantum dots (TGQD) with zigzag edge and broken sublattice symmetry in external magnetic field. The lateral size quantizati…
Electronic properties of gated triangular graphene quantum dots: Magnetism, correlations, and geometrical effects
P. Potasz, A. D. Guclu, A. Wojs +1
We present a theory of electronic properties of gated triangular graphene quantum dots with zigzag edges as a function of size and carrier density. We focus on electronic correlati…
Electric-field controlled spin in bilayer triangular graphene quantum dots
A. D. Guclu, P. Potasz, P. Hawrylak
We present theoretical results based on mean-field and exact many-body approaches showing that in bilayer triangular graphene quantum dots with zigzag edges the magnetism can be co…
Edge stability, reconstruction, zero-energy states and magnetism in triangular graphene quantum dots with zigzag edges
Oleksandr Voznyy, Alev Devrim Güçlü, Pawel Potasz +1
We present the results of ab-initio density functional theory based calculations of the stability and reconstruction of zigzag edges in triangular graphene quantum dots. We show th…
Excitonic absorption in gate controlled graphene quantum dots
A. D. Guclu, P. Potasz, P. Hawrylak
We present a theory of excitonic processes in gate controlled graphene quantum dots. The dependence of the energy gap on shape, size and edge for graphene quantum dots with up to a…