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Breakdown of Charge-Conjugation Symmetry of Disclinations in 2D Crystals
Ruslan Yamaletdinov, Mikhail I. Katsnelson, Oleg V. Yazyev
Disclinations are elementary topological defects in two-dimensional (2D) crystalline membranes, yet their elastic properties remain largely unexplored. Using atomistic simulations,…
First-Principles Wannier Representation of Proximity Effects
Yaroslav Zhumagulov, Johan Félisaz, Stepan S. Tsirkin +2
Proximity effects in layered heterostructures are usually represented by static parameters fitted to first-principles bands, which discards the energy dependence of the virtual hyb…
Electronic properties and topological aspects of graphene nanohelicoids
Xiaoqian Liu, Arsen Herasymchuk, Yaroslav Zhumagulov +1
We introduce graphene nanohelicoids, geometric analogs of graphene nanoribbons, in which the honeycomb lattice is embedded on a helicoidal surface. Starting from the three-dimensio…
Charge carrier flow through trimmed graphene nanoribbon junctions
Julien Leuenberger, Kristiāns Čerņevičs, Oleg V. Yazyev
As Moore's law approaches its fundamental limits, the development of nanoelectronic devices using low-dimension materials has become a promising avenue for further miniaturization…
Electronic states at twist stacking faults in rhombohedral graphite
Xiaoqian Liu, Yifei Guan, Oleg V. Yazyev
Flat bands in graphitic materials emerged as a platform for realizing tunable correlated physics. As a nodal-line semimetal, rhombohedral graphite features flat drumhead surface st…
Magnetoelectric Switching of Magnetic Order in Rhombohedral Graphene
Kilian Krötzsch, Arsen Herasymchuk, Yaroslav Zhumagulov +6
A finite Hall conductance under zero magnetic field implies time reversal symmetry (TRS) breaking due to magnetic order. In rhombohedral stacked multilayer graphene, the angular mo…
Strongly correlated Hofstadter subbands in minimally twisted bilayer graphene
Cheng Shen, Yifei Guan, Davide Pizzirani +7
Moiré superlattice in twisted bilayer graphene has been proven to be a versatile platform for exploring exotic quantum phases. Extensive investigations have been invoked focusing o…
Design Rules for Interconnects Based on Graphene Nanoribbon Junctions
Kristiāns Čerņevičs, Oleg V. Yazyev
Graphene nanoribbons (GNRs) produced by means of bottom-up chemical self-assembly are considered promising candidates for the next-generation nanoelectronic devices. We address the…
Electrical detection of the flat band dispersion in van der Waals field-effect structures
Gabriele Pasquale, Edoardo Lopriore, Zhe Sun +6
Two-dimensional flat-band systems have recently attracted considerable interest due to the rich physics unveiled by emergent phenomena and correlated electronic states at van Hove…
Observation of Kekulé vortices induced in graphene by hydrogen adatoms
Y. Guan, C. Dutreix, H. Gonzales-Herrero +5
Fractional charges are one of the wonders of the fractional quantum Hall effect, a liquid of strongly correlated electrons in a large magnetic field. Fractional excitations are als…
Flat bands in bilayer graphene induced by proximity with polar -BN superlattices
Marta Brzezińska, Oleg V. Yazyev
Motivated by the observation of polarization superlattices in twisted multilayers of hexagonal boron nitride (-BN), we address the possibility of using these heterostructures fo…
Electronic transport in graphene with out-of-plane disorder
Yifei Guan, Oleg V. Yazyev
Real-world samples of graphene often exhibit various types of out-of-plane disorder -- ripples, wrinkles and folds -- introduced at the stage of growth and transfer processes. Thes…
Electronic excitations and spin interactions in chromium trihalides from embedded many-body wavefunctions
Ravi Yadav, Lei Xu, Michele Pizzochero +3
Although chromium trihalides are widely regarded as a promising class of two-dimensional magnets for next-generation devices, an accurate description of their electronic structure…
Flat-band-induced many-body interactions and exciton complexes in a layered semiconductor
Gabriele Pasquale, Zhe Sun, Kristians Cernevics +7
Interactions among a collection of particles generate many-body effects in solids resulting in striking modifications of material properties. The heavy carrier mass that yields str…
Re-entrant magic-angle phenomena in twisted bilayer graphene in integer magnetic fluxes
Yifei Guan, Oleg V. Yazyev, Alexander Kruchkov
In this work we address the re-entrance of magic-angle phenomena (band flatness and quantum-geometric transport) in twisted bilayer graphene (TBG) subjected to strong magnetic flux…
Fate of the non-Hermitian skin effect in many-body fermionic systems
Faisal Alsallom, Loïc Herviou, Oleg V. Yazyev +1
We revisit the fate of the skin modes in many-body non-Hermitian fermionic systems. Contrary to the single-particle case, the many-body ground state cannot exhibit an exponential l…
Landau Levels of the Euler Class Topology
Yifei Guan, Adrien Bouhon, Oleg V. Yazyev
Two-dimensional systems with () symmetry exhibit the Euler class topology in each two-band subspace realizing a fragile topology b…
Crystal Field Effect and Electric Field Screening in Multilayer Graphene with and without Twist
Nikita V. Tepliakov, QuanSheng Wu, Oleg V. Yazyev
We address the intrinsic polarisation and screening of external electric field in a broad range of ordered and twisted configurations of multilayer graphene, using an ab initio app…
Chiral Decomposition of Twisted Graphene Multilayers with Arbitrary Stacking
ShengNan Zhang, Bo Xie, QuanSheng Wu +2
We formulate the chiral decomposition rules that govern the electronic structure of a broad family of twisted multilayer graphene configurations that combine arbitrary stacki…
Electronic transport across quantum dots in graphene nanoribbons: Toward built-in gap-tunable metal-semiconductor-metal heterojunctions
Kristiāns Čerņevičs, Oleg V. Yazyev, Michele Pizzochero
The success of all-graphene electronics is severely hindered by the challenging realization and subsequent integration of semiconducting channels and metallic contacts. Here, we co…
Landau Levels as a Probe for Band Topology in Graphene Moiré Superlattices
QuanSheng Wu, Jianpeng Liu, Oleg V. Yazyev
We propose Landau levels as a probe for the topological character of electronic bands in two-dimensional moiré superlattices. We consider two configurations of twisted double bilay…
Even-odd conductance effect in graphene nanoribbons induced by edge functionalization with aromatic molecules: Basis for novel chemosensors
Kristiāns Čerņevičs, Michele Pizzochero, Oleg V. Yazyev
We theoretically investigate the electron transport in armchair and zigzag graphene nanoribbons (GNRs) chemically functionalized with p-polyphenyl and polyacene groups of increasin…
Moiré Flat Bands in Twisted Double Bilayer Graphene
Fatemeh Haddadi, QuanSheng Wu, Alex J. Kruchkov +1
We investigate twisted double bilayer graphene (TDBG), a four-layer system composed of two AB-stacked graphene bilayers rotated with respect to each other by a small angle. Our ab…
Observation of Weyl nodes in robust type-II Weyl semimetal WP2
M. -Y. Yao, N. Xu, Q. Wu +9
Distinct to type-I Weyl semimetals (WSMs) that host quasiparticles described by the Weyl equation, the energy dispersion of quasiparticles in type-II WSMs violates Lorentz invarian…