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60 papers
Interacting type-II semi-Dirac quasiparticles
Mohamed M. Elsayed, Taras I. Lakoba, Valeri N. Kotov
Type-II semi-Dirac fermions in two dimensions have been proposed to describe topologically nontrivial low-energy excitations in titanium/vanadium oxide heterostructures. These quas…
Microscopic lattice model for quartic semi-Dirac fermions in two dimensions
Mohamed M. Elsayed, Valeri N. Kotov
We propose a lattice model for the realization of exotic quartic semi-Dirac fermions, i.e. quasiparticles exhibiting a dispersion with quartic momentum dependence in a given direct…
Coulomb interactions in systems of generalized semi-Dirac fermions
Mohamed M. Elsayed, Bruno Uchoa, Valeri N. Kotov
Interactions have strong effects in systems with flat bands. We examine the role of Coulomb interactions in two dimensional chiral anisotropic quasiparticles that disperse linearly…
Polarization Charge around Impurities in Two-Dimensional Anisotropic Dirac Systems
Mohamed M. Elsayed, Sang Wook Kim, Juan M. Vanegas +1
Introducing quasiparticle anisotropy in graphene via uniaxial strain has a profound effect on the polarization charge density induced by external impurities, both Coulomb and short…
Quantum Atomic Matter Near Two-Dimensional Materials in Microgravity
Adrian Del Maestro, Sang Wook Kim, Nicholas P. Bigelow +2
Novel two-dimensional (2D) atomically flat materials, such as graphene and transition-metal dichalcogenides, exhibit unconventional Dirac electronic spectra. We propose to effectiv…
Strain-induced superfluid transition for atoms on graphene
Sang Wook Kim, Mohamed Elsayed, Nathan S. Nichols +5
Bosonic atoms deposited on atomically thin substrates represent a playground for exotic quantum many-body physics due to the highly-tunable, atomic-scale nature of the interaction…