Zobrazeno 1 - 10
of 144
pro vyhledávání: '"Bena, Cristina"'
We consider the most energetically favorable symmetry-allowed spin-singlet and spin-triplet superconducting pairing symmetries in twisted bilayer graphene at the magic angle, whose normal state physics is described by a six-band effective tight-bindi
Externí odkaz:
http://arxiv.org/abs/2307.13030
Autor:
Pangburn, Emile, Haurie, Louis, Crépieux, Adeline, Awoga, Oladunjoye A., Sedlmayr, Nicholas, Black-Schaffer, Annica M., Pépin, Catherine, Bena, Cristina
We consider the most energetically favorable symmetry-allowed spin-singlet and spin-triplet superconducting pairing symmetries in monolayer and few-layer graphene, and for each calculate the energy spectrum in the presence of a scalar or magnetic imp
Externí odkaz:
http://arxiv.org/abs/2212.07445
Superconductivity in monolayer and few-layer graphene: II. Topological edge states and Chern numbers
Autor:
Crépieux, Adeline, Pangburn, Emile, Haurie, Louis, Awoga, Oladunjoye A., Black-Schaffer, Annica M., Sedlmayr, Nicholas, Pépin, Catherine, Bena, Cristina
We study the emergence of electronic edge states in superconducting (SC) monolayer, bilayer, and trilayer graphene for both spin-singlet and spin-triplet SC order parameters. We focus mostly on the gapped chiral $p+ip'$- and $d+id'$-wave SC states th
Externí odkaz:
http://arxiv.org/abs/2211.11778
Autor:
Pangburn, Emile, Haurie, Louis, Crépieux, Adeline, Awoga, Oladunjoye A., Black-Schaffer, Annica M., Pépin, Catherine, Bena, Cristina
We review all symmetry-allowed spin-singlet and spin-triplet superconducting (SC) order parameters in graphene ($s$-wave, $d$-wave, $p$-wave, and $f$-wave) generated by generic onsite, nearest-neighbor (NN), and next-to-nearest-neighbor (NNN) pairing
Externí odkaz:
http://arxiv.org/abs/2211.05146
Autor:
Sedlmayr, Nicholas, Bena, Cristina
Publikováno v:
J. Phys.: Condens. Matter 34, 104004 (2022)
We revisit the problem of Majorana states in chains of scalar impurities deposited on a superconductor with a mixed s-wave and p-wave pairing. We also study the formation of Majorana states for magnetic impurity chains. We find that the magnetic impu
Externí odkaz:
http://arxiv.org/abs/2111.02214
We study the interfaces between ABC and ABA regions in multilayer graphene, in particular we consider regions in which the transition between the ABA and ABC structure arises due to the local compression in one of the graphene layers for a zigzag int
Externí odkaz:
http://arxiv.org/abs/2106.15627
Autor:
Kaladzhyan, Vardan, Pinon, Sarah, Joucken, Frédéric, Ge, Zhehao, Quezada-Lopez, Eberth A., Taniguchi, T., Watanabe, K., Velasco Jr, Jairo, Bena, Cristina
Publikováno v:
Phys. Rev. B 104, 155418 (2021)
We use an exact analytical technique [Phys. Rev. B \textbf{101}, 115405 (2020), Phys. Rev. B \textbf{102}, 165117 (2020)] to recover the surface Green's functions for Bernal (ABA) and rhombohedral (ABC) graphite. For rhombohedral graphite we recover
Externí odkaz:
http://arxiv.org/abs/2105.08723
Autor:
Kaladzhyan, Vardan, Joucken, Frédéric, Ge, Zhehao, Quezada-Lopez, Eberth A., Taniguchi, Takashi, Watanabe, Kenji, Velasco Jr, Jairo, Bena, Cristina
We calculate the form of quasiparticle interference patterns in bilayer graphene within a low-energy description, taking into account perturbatively the trigonal warping terms. We introduce four different types of impurities localized on the A and B
Externí odkaz:
http://arxiv.org/abs/2105.01068
Autor:
Joucken, Frédéric, Bena, Cristina, Ge, Zhehao, Quezada-Lopez, Eberth A., Ducastelle, François, Tanagushi, Takashi, Watanabe, Kenji, Velasco Jr, Jairo
Publikováno v:
Phys. Rev. Lett. 127, 106401 (2021)
The properties of semiconductors can be crucially impacted by midgap states induced by dopants, which can be native or intentionally incorporated in the crystal lattice. For Bernal-stacked bilayer graphene (BLG), which has a tunable bandgap, the exis
Externí odkaz:
http://arxiv.org/abs/2104.15105
Autor:
Joucken, Frederic, Bena, Cristina, Ge, Zhehao, Quezada-Lopez, Ebert A., Pinon, Sarah, Kaladzhyan, Vardan, Taniguchi, Takashi, Watanabe, Kenji, Ferreira, Aires, Velasco Jr, Jairo
Graphite crystals used to prepare graphene-based heterostructures are generally assumed to be defect free. We report here scanning tunneling microscopy results that show graphite commonly used to prepare graphene devices can contain a significant amo
Externí odkaz:
http://arxiv.org/abs/2104.10620