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Optical imprinting of superlattices in two-dimensional materials
Hwanmun Kim, Hossein Dehghani, Hideo Aoki +2
We propose an optical method of shining circularly polarized and spatially periodic laser fields to imprint superlattice structures in two-dimensional electronic systems. By changi…
Theoretical possibilities for flat-band superconductivity
Hideo Aoki
One novel arena for designing superconductors with high is the flat-band systems. A basic idea is that flat bands, arising from quantum mechanical interference, give unique o…
Complete Spin and Valley Polarization by Total External Reflection from Potential Barriers in Bilayer Graphene and Monolayer Transition Metal Dichalcogenides
P. A. Maksym, H. Aoki
It is shown that potential barriers in bilayer graphene (BLG) and monolayer transition metal dichalcogenides (TMDs) can split a valley unpolarized incident current into reflected a…
Model construction and a possibility of cuprate-like pairing in a new d9 nickelate superconductor (Nd,Sr)NiO2
Hirofumi Sakakibara, Hidetomo Usui, Katsuhiro Suzuki +3
Effective models are constructed for a newly discovered superconductor (Nd,Sr)NiO2, which has been considered as a possible nickelate analogue of the cuprates owing to the d9 elect…
Topologically Protected Doubling of Tilted Dirac Fermions in Two Dimensions
Tohru Kawarabayashi, Hideo Aoki, Yasuhiro Hatsugai
The doubling of massless Dirac fermions on two-dimensional lattices is theoretically studied. It has been shown that the doubling of massless Dirac fermions on a lattice with broke…
SO(4) FLEX+DMFT formalism with SU(2)SU(2)-symmetric impurity solver for superconductivity in the repulsive Hubbard model
Sharareh Sayyad, Naoto Tsuji, Massimo Capone +1
Here we have developed a FLEX+DMFT formalism, where the symmetry properties of the system are incorporated by constructing a SO(4) generalization of the conventional fluctuation-ex…
Pairing and non-Fermi liquid behavior in partially flat-band systems
Sharareh Sayyad, Edwin W. Huang, Motoharu Kitatani +4
While multiband systems are usually considered for flat-band physics, here we study one-band models that have flat portions in the dispersion to explore correlation effects in the…