Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Viola, Giovanni"'
Publikováno v:
Phys. Rev. B 97, 085429 (2018)
This work analyses how impurities and vacancies on the surface of a graphene sample affect its optical conductivity and plasmon excitations. The disorder is analysed in the self-consistent Green's function formulation and nonlocal effects are fully t
Externí odkaz:
http://arxiv.org/abs/1710.10633
Publikováno v:
Phys. Rev. B 97, 085419 (2018)
We demonstrate that plasmons in graphene can be manipulated using a DC current. A source-drain current lifts the forward/backward degeneracy of the plasmons, creating two modes with different propagation properties parallel and antiparallel to the cu
Externí odkaz:
http://arxiv.org/abs/1710.00338
Publikováno v:
2DMaterials, 4, 025103 (2017)
We theoretically demonstrate a high-sensitivity, graphene-plasmon based refractive index sensor working in the mid-infrared at room temperature. The bulk figure of merit of our sensor reaches values above $10$, but the key aspect of our proposed plas
Externí odkaz:
http://arxiv.org/abs/1705.10129
We theoretically investigate under which conditions nonlocal plasmon response in monolayer graphene can be detected. To this purpose, we study optical scattering off graphene plasmon resonances coupled using a subwavelength dielectric grating. We com
Externí odkaz:
http://arxiv.org/abs/1610.04146
Publikováno v:
Phys. Rev. Lett. 114, 143601 (2015)
Using an approach inspired from Spin Glasses, we show that the multimode disordered Dicke model is equivalent to a quantum Hopfield network. We propose variational ground states for the system at zero temperature, which we conjecture to be exact in t
Externí odkaz:
http://arxiv.org/abs/1501.02209
Autor:
Viola, Giovanni, DiVincenzo, David P.
Publikováno v:
Phys. Rev. X 4, 021019 (2014)
The electronic circulator, and its close relative the gyrator, are invaluable tools for noise management and signal routing in the current generation of low-temperature microwave systems for the implementation of new quantum technologies. The current
Externí odkaz:
http://arxiv.org/abs/1312.5190
The \nu=5/2 anti-Pfaffian state and the \nu=2/3 state are believed to have an edge composed of counter-propagating charge and neutral modes. This situation allows the generation of a pure thermal bias between two composite edge states across a quantu
Externí odkaz:
http://arxiv.org/abs/1203.3813
Autor:
Ferraro, Dario, Viola, Giovanni
We propose a $\mathbb{Z}_{2}$ classification of Abelian time-reversal fractional topological insulators in terms of the composite fermions picture. We consider the standard toy model where spin up and down electrons are subjected to opposite magnetic
Externí odkaz:
http://arxiv.org/abs/1112.5399
Autor:
Cappelli, Andrea, Viola, Giovanni
Publikováno v:
J.Phys.A44:075401,2011
Partition functions of edge excitations are obtained for non-Abelian Hall states in the second Landau level, such as the anti-Read-Rezayi state, the Bonderson-Slingerland hierarchy and the Wen non-Abelian fluid, as well as for the non-Abelian spin-si
Externí odkaz:
http://arxiv.org/abs/1007.1732
Publikováno v:
Ann. Phys.324:584-599, 2009; Annals Phys.324:584-599,2009
We apply generalized Bogoliubov transformations to the transfer matrix of relativistic field theories regularized on a lattice. We derive the conditions these transformations must satisfy to factorize the transfer matrix into two terms which propagat
Externí odkaz:
http://arxiv.org/abs/0808.1110