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36 papers · 1 filter
Quadratic speedup for spatial search by continuous-time quantum walk
Simon Apers, Shantanav Chakraborty, Leonardo Novo +1
Continuous-time quantum walks provide a natural framework to tackle the fundamental problem of finding a node among a set of marked nodes in a graph, known as spatial search. Wheth…
Room temperature two terminal tunnel magnetoresistance in lateral graphene transistor
C. I. L. de Araujo, H. A. Teixeira, O. O. Toro +9
We investigate the behavior of both pure spin and spin-polarized currents measured with four probe non-local and two probe local configurations up to room temperature and under ext…
Absorption and optical selection rules of tunable excitons in biased bilayer graphene
J. C. G. Henriques, Itai Epstein, N. M. R. Peres
Biased bilayer graphene, with its easily tunable band gap, presents itself as the ideal system to explore the excitonic effect in graphene based systems. In this paper we study the…
Non-linear Boson Sampling
Nicolò Spagnolo, Daniel J. Brod, Ernesto F. Galvão +1
Boson Sampling is a task that is conjectured to be computationally hard for a classical computer, but which can be efficiently solved by linear-optical interferometers with Fock st…
Ising and XY paramagnons in two-dimensional 2H-NbSe
A. T. Costa, M. Costa, J. Fernández-Rossier
Paramagnons are the collective modes that govern the spin response of nearly magnetic conductors. In some cases they mediate electron pairing leading to superconductivity. This sce…
Hubbard model for spin-1 Haldane chains
G. Catarina, J. Fernández-Rossier
The Haldane phase for antiferromagnetic spin-1 chains is a celebrated topological state of matter, featuring gapped excitations and fractional spin-1/2 edge states. Here, we provid…