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- A O Sboychakov, A V Rozhkov, K I Kugel, A L Rakhmanov, Franco Nori
- 2013

A mechanism for electronic phase separation in iron pnictides is proposed. It is based on the competition between commensurate and incommensurate spin-density-wave phases in a system with an imperfect doping-dependent nesting of a multisheeted Fermi surface. We model the Fermi surface by two elliptical electron pockets and three circular hole pockets. The… (More)

- A V Rozhkov, S Savel 'ev, Franco Nori
- 2009

We investigate the electronic band structure of an undoped graphene armchair nanoribbon. We demonstrate that such nanoribbon always has a gap in its electronic spectrum. Even if the parameters of the noninteracting Hamiltonian are fine tuned to a point where single-electron calculations predict a metallic dispersion, the system becomes unstable toward the… (More)

Exploiting the peculiar properties of proximity-induced superconductivity on the surface of a topological insulator, we propose a device, which allows the creation of a Majorana fermion inside the core of a pinned Abrikosov vortex. The relevant Bogolyubov-de Gennes equations are studied analytically. We demonstrate that in this system the zero-energy… (More)

- L Accardo, M Aguilar, D Aisa, B Alpat, A Alvino, G Ambrosi +294 others
- Physical review letters
- 2014

A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200 GeV the positron… (More)

- A V Rozhkov, Franco Nori
- 2010

We generalize the known solution of the Schrödinger equation, describing a particle confined to a triangular area, for a triangular graphene quantum dot with armchair-type boundaries. The quantization conditions, wave functions, and the eigenenergies are determined analytically. As an application, we calculate the corrections to the quantum dot's energy… (More)

- R S Akzyanov, A V Rozhkov, A L Rakhmanov, Franco Nori
- 2014

We study a heterostructure which consists of a topological insulator and a superconductor with a hole. The hole pins a vortex. The system supports a robust Majorana fermion state bound to the vortex core. We investigate the possibility of using scanning tunneling spectroscopy (i) to detect the Majorana fermion in the proposed setup and (ii) to study excited… (More)

The electronic properties of a graphene sheet with attached hydrogen atoms are studied using a modified Falicov-Kimball model on the honeycomb lattice. It is shown that in the ground state this system separates into two phases: fully hydrogenated graphene (graphane) and hydrogen-free graphene. The graphene-graphane boundary acquires a positive interface… (More)

- A V Rozhkov, G Giavaras, Yury P Bliokh, Valentin Freilikher, Franco Nori
- 2011

Keywords: Mesoscopic graphene structures Nanoribbons Quantum dots pn-junctions pnp-structures Quantum barriers a b s t r a c t This brief review discusses electronic properties of mesoscopic graphene-based structures. These allow controlling the confinement and transport of charge and spin; thus, they are of interest not only for fundamental research, but… (More)

- A V Rozhkov, Daniel P Arovas
- 2000

We investigate the Josephson coupling between two superconductors mediated through an infinite U Anderson impurity, adapting a variational wavefunction approach which has proved successful for the Kondo model. Unlike the Kondo problem, however, a crossing of singlet and doublet state energies may be produced by varying the ratio of Kondo energy to… (More)

- M Aguilar, D Aisa, B Alpat, A Alvino, G Ambrosi, K Andeen +294 others
- Physical review letters
- 2015

Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.9 GV to 3 TV based on 50 million events is presented and compared to the proton flux. The detailed… (More)