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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,…
Optical properties, plasmons, and orbital Skyrme textures in twisted TMDs
Lorenzo Cavicchi, Koen J. A. Reijnders, Mikhail I. Katsnelson +1
In the long-wavelength limit, Bloch-band Berry curvature has no effect on the bulk plasmons of a two-dimensional electron system. In this Letter we show instead that bulk plasmons…
Magnetic polaron and antiferro-ferromagnetic transition in doped bilayer CrI
D. Soriano, M. I. Katsnelson
Gate-induced magnetic switching in bilayer CrI has opened new ways for the design of novel low-power magnetic memories based on van der Waals heterostructures. The proposed swi…
Measuring the Berry phase of graphene from wavefront dislocations in Friedel oscillations
C. Dutreix, H. González-Herrero, I. Brihuega +3
Electronic band structures dictate the mechanical, optical and electrical properties of crystalline solids. Their experimental determination is therefore of crucial importance for…
Quantum many-body dynamics of the Einstein-de Haas effect
J. H. Mentink, M. I. Katsnelson, M. Lemeshko
In 1915, Einstein and de Haas and Barnett demonstrated that changing the magnetization of a magnetic material results in mechanical rotation, and vice versa. At the microscopic lev…
Heisenberg-exchange-free nanoskyrmion mosaic
E. A. Stepanov, S. A. Nikolaev, C. Dutreix +2
Isotropic Heisenberg exchange naturally appears as the main interaction in magnetism, usually favouring long-range spin-ordered phases. The anisotropic Dzyaloshinskii-Moriya intera…
Diffraction catastrophes and semiclassical quantum mechanics for Veselago lensing in graphene
K. J. A. Reijnders, M. I. Katsnelson
We study the effect of trigonal warping on the focussing of electrons by n-p junctions in graphene. We find that perfect focussing, which was predicted for massless Dirac fermions,…
Symmetry breaking and (pseudo)spin polarization in Veselago lenses for massless Dirac fermions
K. J. A. Reijnders, M. I. Katsnelson
We study Veselago lensing of massless Dirac fermions by n-p junctions for electron sources with a certain polarization. This polarization corresponds to pseudospin for graphene and…
Unconventional mass enhancement around the Dirac nodal loop in ZrSiS
S. Pezzini, M. R. van Delft, L. Schoop +5
The topological properties of fermions arise from their low-energy Dirac-like band dispersion and associated chiralities. Initially confined to points, extensions of the Dirac disp…
Dynamical control of electron-phonon interactions with high-frequency light
C. Dutreix, M. I. Katsnelson
This work addresses the one-dimensional problem of Bloch electrons when they are rapidly driven by a homogeneous time-periodic light and linearly coupled to vibrational modes. Star…
Effect of flexural phonons on the hole states in single-layer black phosphorus
S. Brener, A. N. Rudenko, M. I. Katsnelson
Flexural thermal fluctuations in crystalline membranes affect the band structure of the carriers, which leads to an exponential density-of-states (DOS) tail beyond the unperturbed…
Polaronic effects in monolayer black phosphorus on polar substrates
A. Mogulkoc, Y. Mogulkoc, A. N. Rudenko +1
We investigate the effect of charge carrier interaction with surface optical phonons on the band properties of monolayer black phosphorus induced by polar substrates. We develop an…
Friedel oscillations at the surfaces of rhombohedral -layer graphene
C. Dutreix, M. I. Katsnelson
The low-energy physics of rhombohedral -layer graphene mainly arises on the external layers, where most of the π electrons are located. Their Bloch band structure defines a two-…
Scaling behavior and strain dependence of in-plane elastic properties of graphene
J. H. Los, A. Fasolino, M. I. Katsnelson
We show by atomistic simulations that, in the thermodynamic limit, the in-plane elastic moduli of graphene at finite temperature vanish with system size as a power law $ ~ L^…
Dirac electrons and domain walls: a realization in junctions of ferromagnets and topological insulators
Yago Ferreiros, F. J. Buijnsters, M. I. Katsnelson
We study a system of Dirac electrons with finite density of charge carriers coupled to an external electromagnetic field in two spatial dimensions, with a domain wall (DW) mass ter…
Modeling Klein tunneling and caustics of electron waves in graphene
R. Logemann, K. J. A. Reijnders, T. Tudorovskiy +2
We employ the tight-binding propagation method to study Klein tunneling and quantum interference in large graphene systems. With this efficient numerical scheme, we model the propa…
Quantum capacitance and Landau parameters of massless Dirac fermions in graphene
Reza Asgari, Mikhail I. Katsnelson, Marco Polini
We present extensive numerical results for the thermodynamic density of states (i.e. quantum capacitance) of a two-dimensional massless Dirac fermion fluid in a doped graphene shee…
Probing of valley polarization in graphene via optical second-harmonic generation
T. O. Wehling, A. Huber, A. I. Lichtenstein +1
Valley polarization in graphene breaks inversion symmetry and therefore leads to second-harmonic generation. We present a complete theory of this effect within a single-particle ap…
Spin relaxation related to the edge scattering in graphene
V. K. Dugaev, M. I. Katsnelson
We discuss the role of spin-flip scattering of electrons from the magnetized edges in graphene nanoribbons. The spin-flip scattering is associated with strong fluctuations of the m…
Effect of Point Defects on the Optical and Transport Properties of MoS2 and WS2
S. Yuan, R. Roldán, M. I. Katsnelson +1
Imperfections in the crystal structure, such as point defects, can strongly modify the optical and transport properties of materials. Here, we study the effect of point defects on…
Thermodynamics of quantum crystalline membranes
B. Amorim, R. Roldán, E. Cappelluti +3
We investigate the thermodynamic properties and the lattice stability of two-dimensional crystalline membranes, such as graphene and related compounds, in the low temperature quant…
Ferromagnetic two-dimensional crystals: Single layers of K2CuF4
B. Sachs, T. O. Wehling, K. S. Novoselov +2
The successful isolation of graphene ten years ago has evoked a rapidly growing scientific interest in the nature of two-dimensional (2D) crystals. A number of different 2D crystal…
Edge scattering of electrons in graphene
V. K. Dugaev, M. I. Katsnelson
We discuss the contribution of edge scattering to the conductance of graphene nanoribbons and nanoflakes. Using different possible types of the boundary conditions for the electron…
Screening and Collective Modes in Disordered Graphene Antidot Lattices
Shengjun Yuan, Fengping Jin, Rafael Roldán +2
The excitation spectrum and the collective modes of graphene antidot lattices (GALs) are studied in the context of a -band tight-binding model. The dynamical polarizability and…