Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Walet, Niels R."'
Autor:
Vitenburgs, Ingvars, Walet, Niels R.
A study of correlation effects in twisted bilayer graphene is presented using the extended coupled cluster method at consistent mean-field and beyond mean-field truncations. In order to describe the phase transitions in this strongly correlated syste
Externí odkaz:
http://arxiv.org/abs/2405.10863
Autor:
Walet, Niels R., Singh, Jagjit, Kirscher, Johannes, Birse, Michael C., Griesshammer, Harald W., McGovern, Judith A.
We investigate a method to extract response functions (dynamical polarisabilities) directly from a bound-state approach applied to calculations of perturbation-induced reactions. The use of a square-integrable basis leads to a response in the form of
Externí odkaz:
http://arxiv.org/abs/2303.09361
We analyze a special separable and chiral-symmetric model with a quantized quadrupole moment, extending the Benalcazar-Bernevig-Hughes model [Science 357, 61 (2017)]. Using nested-Wilson loop formalism, we give an exact expression for Wannier centers
Externí odkaz:
http://arxiv.org/abs/2208.05058
The effects of the long range electrostatic interaction in twisted bilayer graphene are described using the Hartree-Fock approximation. The results show a significant dependence of the band widths and shapes on electron filling, and the existence of
Externí odkaz:
http://arxiv.org/abs/2109.06038
We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor in order to understand their use as a building block for topological quantum computers. We analyze the second-order topological corner modes that aris
Externí odkaz:
http://arxiv.org/abs/2109.03549
Autor:
Walet, Niels R., Guinea, Francisco
Publikováno v:
Phys. Rev. B 103, 125427 (2021)
We study the effect of twisting on bilayer graphene. The effect of lattice relaxation is included; we look at the electronic structure, piezo-electric charges and spontaneous polarisation. We show that the electronic structure without lattice relaxat
Externí odkaz:
http://arxiv.org/abs/2011.14237
The occurrence of superconducting and insulating phases is well-established in twisted graphene bilayers, and they have also been reported in other arrangements of graphene layers. We investigate three such arrangements: untwisted AB bilayer graphene
Externí odkaz:
http://arxiv.org/abs/2003.05050
Autor:
Li, Yu, Pierobon, Leonardo, Charilaou, Michalis, Braun, Hans-Benjamin, Walet, Niels R., Löffler, Jörg F., Miles, James J., Moutafis, Christoforos
Publikováno v:
Phys. Rev. Research 2, 033006 (2020)
Skyrmionic textures are being extensively investigated due to the occurrence of novel topological magnetic phenomena and their promising applications in a new generation of spintronic devices that take advantage of the robust topological stability of
Externí odkaz:
http://arxiv.org/abs/1911.12781
Autor:
Walet, Niels R., Guinea, Francisco
Publikováno v:
2D Materials (2020) 7 015023
We generalize the continuum model for Moir\'e structures made from twisted graphene layers, in order to include lattice relaxation and the formation of channels at very small (marginal) twist angles. We show that a precise description of the electron
Externí odkaz:
http://arxiv.org/abs/1908.05941
Publikováno v:
Phys. Rev. B 100, 205113 (2019)
The emergence of flat bands in twisted bilayer graphene leads to an enhancement of interaction effects, and thus to insulating and superconducting phases at low temperatures, even though the exact mechanism is still widely debated. The position and s
Externí odkaz:
http://arxiv.org/abs/1906.10570