Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Lewenkopf, Caio"'
We use a combinatorial approach to obtain exact expressions for the many-body density of states of fermionic and bosonic gases with equally spaced single-particle spectra. We identify a mapping that reveals a remarkable property, namely, fermionic an
Externí odkaz:
http://arxiv.org/abs/2409.08696
Autor:
Marques, Mateus, Melo, Bruno M. de Souza, Rocha, Alexandre R., Lewenkopf, Caio, da Silva, Luis G. G. V. Dias
We explore the phase diagram of the Mott metal-insulator transition (MIT), focusing on the effects of particle-hole asymmetry (PHA) in the single-band Hubbard model. Our dynamical mean-field theory (DMFT) study reveals that the introduction of PHA in
Externí odkaz:
http://arxiv.org/abs/2409.06674
Autor:
Vidarte, Kevin J. U., Lewenkopf, Caio
The recently synthesized 30$^\circ$ twisted bilayer graphene (30$^\circ$-TBG) systems are unique quasicrystal systems possessing dodecagonal symmetry with graphene's relativistic properties. We employ a real-space numerical atomistic framework that r
Externí odkaz:
http://arxiv.org/abs/2409.05126
We show that topological phases include disordered materials if the underlying invariant is interpreted as originating from coarse geometry. This coarse geometric framework, grounded in physical principles, offers a natural setting for the bulk-bound
Externí odkaz:
http://arxiv.org/abs/2407.16494
Autor:
Vidarte, Kevin J. U., Lewenkopf, Caio
We present a theoretical investigation of the magnetic properties exhibited by twisted bilayer graphene systems with small twist angles, where the appearance of flat minibands strongly enhances electron-electron interaction effects. We consider a tig
Externí odkaz:
http://arxiv.org/abs/2404.08177
Publikováno v:
Phys. Rev. B 109, L201102 (2024)
We investigate disordered-driven transitions between trivial and topological insulator (TI) phases in two-dimensional (2D) systems. Our study primarily focuses on the BHZ model with Anderson disorder, while other standard 2DTI models exhibit equivale
Externí odkaz:
http://arxiv.org/abs/2401.03028
We study phase transitions driven by structural disorder in noncrystalline topological insulators. We introduce a procedural generation algorithm, the Perlin noise, typically used in computer graphics, to incorporate disorder to a two-dimensional lat
Externí odkaz:
http://arxiv.org/abs/2312.08779
Autor:
Lima, Leandro R. F., Lewenkopf, Caio
Publikováno v:
Phys. Rev. B 106, 245408 (2022)
We study the suppression of the conductance quantization in quantum spin Hall systems by a combined effect of electronic interactions and edge disorder, that is ubiquitous in exfoliated and CVD grown 2D materials. We show that the interplay between t
Externí odkaz:
http://arxiv.org/abs/2210.03846
Autor:
Vidarte, Kevin J. U., Lewenkopf, Caio
Publikováno v:
Phys. Rev. B 106, 155414 (2022)
We study the Landau level spectrum of bulk graphene monolayers beyond the Dirac Hamiltonian with linear dispersion. We consider an effective Wannier-like tight-binding model obtained from ab initio calculations, that includes long-range electronic ho
Externí odkaz:
http://arxiv.org/abs/2210.03636
Autor:
Focassio, Bruno, Schleder, Gabriel R., de Lima, F. Crasto, Lewenkopf, Caio, Fazzio, Adalberto
Publikováno v:
Phys. Rev. B 104, 214206 (2021)
Crystalline $\rm Bi_2Se_3$ is one of the most explored three-dimensional topological insulator, with a $0.3\;\rm eV$ energy gap making it promising for applications. Its amorphous counterpart could bring to light new possibilities for large scale syn
Externí odkaz:
http://arxiv.org/abs/2109.10858