Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Bednik, Grigory"'
Autor:
Bednik, Grigory
We consider $30^{\circ}$ twisted bilayer formed by two copies of Haldane model and explore evolution of its properties with varying interlayer coupling strength. Specifically, we compute the system's energy spectrum, its fractal dimensions, topologic
Externí odkaz:
http://arxiv.org/abs/2409.02373
Publikováno v:
PRX Energy 3, 023007 (2024)
The search for materials with large thermopower is of great practical interest. Dirac and Weyl semimetals have recently proven to exhibit superior thermoelectric properties, particularly when subjected to a quantizing magnetic field. Here we consider
Externí odkaz:
http://arxiv.org/abs/2403.03084
Autor:
Bednik, Grigory, Kozii, Vladyslav
Publikováno v:
Phys. Rev. B 109, 045106 (2024)
We study the second-order optical response of Weyl semimetals in the presence of a magnetic field. We consider an idealized model of a perfectly linear Weyl node and use the Kubo formula at zero temperature to calculate the intrinsic contribution to
Externí odkaz:
http://arxiv.org/abs/2310.02578
We develop a comprehensive theory of twisted bilayer magnetism. Starting from the first-principles calculations of two-dimensional honeycomb magnet CrI3, we construct the generic spin models that represent a broad class of twisted bilayer magnetic sy
Externí odkaz:
http://arxiv.org/abs/2206.05264
Publikováno v:
Physical Review B 105, 125132 (2022)
We study the hydrodynamic transport of electrons in a Weyl semimetal in a strong magnetic field. Impurity scattering in a Weyl semimetal with two Weyl nodes is strongly anisotropic as a function of the direction of the field and is significantly supp
Externí odkaz:
http://arxiv.org/abs/2108.09313
Autor:
Drucker, Nathan C., Nguyen, Thanh, Han, Fei, Luo, Xi, Andrejevic, Nina, Zhu, Ziming, Bednik, Grigory, Nguyen, Quynh T., Chen, Zhantao, Nguyen, Linh K., Williams, Travis J., Stone, Matthew B., Kolesnikov, Alexander I., Chi, Songxue, Fernandez-Baca, Jaime, Hogan, Tom, Alatas, Ahmet, Puretzky, Alexander A., Geohegan, David B., Huang, Shengxi, Yu, Yue, Li, Mingda
The interplay between strong electron correlation and band topology is at the forefront of condensed matter research. As a direct consequence of correlation, magnetism enriches topological phases and also has promising functional applications. Howeve
Externí odkaz:
http://arxiv.org/abs/2103.08489
Autor:
Nguyen, Thanh, Tsurimaki, Yoichiro, Pablo-Pedro, Ricardo, Bednik, Grigory, Liu, Tongtong, Apte, Anuj, Andrejevic, Nina, Li, Mingda
Publikováno v:
New J. Phys. 24, 013016 (2022)
Topological nodal semimetals are known to host a variety of fascinating electronic properties due to the topological protection of the band-touching nodes. Neutron scattering, despite its power in probing elementary excitations, has not been routinel
Externí odkaz:
http://arxiv.org/abs/2101.04046
Autor:
Bednik, Grigory
Publikováno v:
Phys. Rev. B 102, 125119 (2020)
We perform mean-field study of possible magnetic instabilities in Dirac semimetals. We find that Dirac electrons naturally host antiferromagnetic or spin density wave ground states, though their specific configurations may vary depending on specific
Externí odkaz:
http://arxiv.org/abs/1906.05883
Autor:
Bednik, Grigory
Publikováno v:
Phys. Rev. B 100, 184414 (2019)
Machine learning methods are being actively considered as a new tool of describing many body physics. However, so far, their capabilities has been only demonstrated in previously studied models, such as e.g. Ising model. Here, we consider a simple pr
Externí odkaz:
http://arxiv.org/abs/1902.01845
Autor:
Bednik, Grigory
Publikováno v:
Phys. Rev. B 100, 024420 (2019)
In this paper, we study topological properties of 3D lattice dimer model. We demonstrate, that the dimer model on a bipartite lattice possesses topological defects, which are exactly characterized by Hopf invariant. We derive its explicit algebraic e
Externí odkaz:
http://arxiv.org/abs/1901.04527