Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Kruchkov, Alex"'
Coexistence of ultraheavy and ultrarelativistic Dirac quasiparticles in sandwiched trilayer graphene
Publikováno v:
Nano Letters 20, 3030 (2020)
Electrons in quantum materials exhibiting coexistence of dispersionless (flat) bands piercing dispersive (steep) bands can give rise to strongly correlated phenomena, and are associated with unconventional superconductivity. It is known that in twist
Externí odkaz:
http://arxiv.org/abs/1907.00952
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 initio band structure calculations reveal a considerable energy gap at
Externí odkaz:
http://arxiv.org/abs/1906.00623
Publikováno v:
Phys. Rev. Lett. 124, 056802 (2020)
We consider conditions for the existence of boundary modes in non-Hermitian systems with edges of arbitrary co-dimension. Through a universal formulation of formation criteria for boundary modes in terms of local Green functions, we outline a generic
Externí odkaz:
http://arxiv.org/abs/1902.07217
Publikováno v:
Phys. Rev. B 100, 085109 (2019)
When two monolayers of graphene are stacked with a small relative twist angle, the resulting band structure exhibits a remarkably flat pair of bands at a sequence of 'magic angles' where correlation effects can induce a host of exotic phases. Here, w
Externí odkaz:
http://arxiv.org/abs/1901.10485
Publikováno v:
Phys. Rev. Lett. 122, 106405 (2019)
Twisted Bilayer graphene (TBG) is known to feature isolated and relatively flat bands near charge neutrality, when tuned to special magic angles. However, different criteria for the magic angle such as the vanishing of Dirac speed, minimal bandwidth
Externí odkaz:
http://arxiv.org/abs/1808.05250
Autor:
Huang, Ping, Cantoni, Marco, Kruchkov, Alex, Jayaraman, Rajeswari, Magrez, Arnaud, Carbone, Fabrizio, Ronnow, Henrik M.
Magnetic skyrmions are localized nanometric spin textures with quantized winding numbers as the topological invariant. Rapidly increasing attention has been paid to the investigations of skyrmions since their experimental discovery in 2009, due both
Externí odkaz:
http://arxiv.org/abs/1710.09200
Magnetic skyrmions are topologically protected spin-whirl quasiparticles currently considered as promising components for ultra-dense memory devices. In the bulk they form lattices that are stable over just a few Kelvin below the ordering temperature
Externí odkaz:
http://arxiv.org/abs/1703.06081
Autor:
Kruchkov, Alex J., Rønnow, Henrik M.
This paper studies the influence of electric fields on the skyrmion lattice (SkL) in insulating skyrmion compounds with weak magnetoelectric (ME) coupling. The ME coupling mechanism is an interaction between the external electric field $E$ and local
Externí odkaz:
http://arxiv.org/abs/1702.08863
Autor:
Kruchkov, Alex J.
Publikováno v:
Phys. Rev. A 93, 043817 (2016)
This paper introduces a quasiequilibrium one-dimensional Bose-Einstein condensation of photons trapped in a microtube. Light modes with a cut-off frequency (a photon's "mass") interact through different processes of absorption, emission, and scatteri
Externí odkaz:
http://arxiv.org/abs/1512.09257
Autor:
Kruchkov, Alex
Experimental observation of Bose-Einstein condensation (BEC) of photons inside a microcavity induced an extensive study of the phenomenon. Beyond the purely theoretical interest, this phenomenon is believed to be used to create a novel source of ligh
Externí odkaz:
http://arxiv.org/abs/1404.2561