Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Heikkila, Tero T."'
Publikováno v:
Phys. Rev. B 103, 245115 (2021)
We describe a three-dimensional crystalline topological insulator (TI) phase of matter that exhibits spontaneous polarization. This polarization results from the presence of (approximately) flat bands on the surface of such TIs. These flat bands are
Externí odkaz:
http://arxiv.org/abs/2008.02158
Autor:
Heikkila, Tero T., Hyart, Timo
Publikováno v:
Europhys. News 50, 24 (2019)
Recent experimental discoveries of superconductivity and other exotic electronic states in twisted bilayer graphene (TBG) call for a reconsideration of our traditional theories of these states, usually based on the assumption of the presence of a Fer
Externí odkaz:
http://arxiv.org/abs/1904.13099
We review the recent progress in understanding the properties of spin-split superconductors under non-equilibrium conditions. Recent experiments and theories demonstrate a rich variety of transport phenomena occurring in devices based on such materia
Externí odkaz:
http://arxiv.org/abs/1706.08245
Autor:
Arjoranta, Juho, Heikkila, Tero T.
We study the effect of the intrinsic (Rashba or Dresselhaus) spin-orbit interaction in superconductor--nanowire--superconductor (SNS) weak links in the presence of a spin-splitting field that can result either from an intrinsic exchange field or the
Externí odkaz:
http://arxiv.org/abs/1507.02320
Autor:
Heikkila, Tero T., Volovik, Grigori E.
Superconductivity is traditionally viewed as a low-temperature phenomenon. Within the BCS theory this is understood to result from the fact that the pairing of electrons takes place only close to the usually two-dimensional Fermi surface residing at
Externí odkaz:
http://arxiv.org/abs/1504.05824
Akademický článek
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Publikováno v:
Phys. Rev. B 84, 195433 (2011)
The experimental observation of quantum phenomena in mechanical degrees of freedom is difficult, as the systems become linear towards low energies and the quantum limit, and thus reside in the correspondence limit. Here we investigate how to access q
Externí odkaz:
http://arxiv.org/abs/1105.3318
Autor:
Heikkila, Tero T., Volovik, G. E.
Publikováno v:
Pisma Zh.Eksp.Teor.Fiz.91:669-675,2010; JETP Lett.92:681-686,2010
We study exotic fermions with spectrum E^2 ~ p^{2N}. Such spectrum emerges in the vicinity of the Fermi point with multiple topological charge N, if special symmetry is obeyed. When this symmetry is violated, the multiple Fermi point typically splits
Externí odkaz:
http://arxiv.org/abs/1010.0393
Publikováno v:
Solid State Communications 150, 475 (2010).
We study the spin thermalization, i.e., the inter-spin energy relaxation mediated by electron-electron scattering in small spin valves. When one or two of the dimensions of the spin valve spacer are smaller than the thermal coherence length, the dire
Externí odkaz:
http://arxiv.org/abs/1004.3656
Publikováno v:
Phys. Rev. B 81, 100408(R) (2010).
We study the concept of spin heat accumulation in excited spin valves, more precisely the effective electron temperature that may become spin dependent, both in linear response and far from equilibrium. A temperature or voltage gradient create non-eq
Externí odkaz:
http://arxiv.org/abs/0910.4867