Crossed Andreev reflection in superconducting graphene spin-valves: Spin-switch effect (2009)
Linder, Jacob, Zareyan, Malek, Sudbø, Asle
We consider the non-local quantum transport properties of a graphene superconducting spin-valve. It is shown that one may create a spin-switch effect between perfect elastic co-tunneling (CT) and...
Shot noise of a ferromagnetic nanowire with a domain wall (2009)
Abdollahipour, Babak, Zareyan, Malek, Asaadi, Nazila
We study shot noise of the spin-polarized current in a diffusive ferromagnetic nanowire which contains a ballistic domain wall. We find that the existence of a short domain wall influences strongly...
Proximity effect in ferromagnet/superconductor hybrids: from diffusive to ballistic motion (2009)
Linder, Jacob, Zareyan, Malek, Sudbø, Asle
We present an analytical study of the proximity effect in ferromagnet/superconductor (F/S) heterostructures, allowing for an arbitrary magnetic exchange energy as well as arbitrary impurity and...
Width of the $0-\pi$ phase transition in diffusive magnetic Josephson junctions (2008)
Shomali, Zahra, Zareyan, Malek, Belzig, Wolfgang
We investigate the Josephson current between two superconductors (S) which are connected through a diffusive magnetic junction with a complex structure (F$_{c}$). Using the quantum circuit theory, we...
Long range Josephson coupling through ferromagnetic graphene (2008)
Moghaddam, Ali G., Zareyan, Malek
We study the Josephson effect in graphene-based ballistic superconductor-ferromagnet-superconductor (SFS) junctions. We find an oscillatory Josephson coupling $I_c R_N$ of F graphene whose amplitude...
Graphene based superconducting quantum point contacts (2008)
Moghaddam, Ali G., Zareyan, Malek
We investigate the Josephson effect in the graphene nanoribbons of length $L$ smaller than the superconducting coherence length and an arbitrary width $W$. We find that in contrast to an ordinary...
Anisotropic minimal conductivity of graphene bilayers (2008)
Moghaddam, Ali G., Zareyan, Malek
Fermi line of bilayer graphene at zero energy is transformed into four separated points positioned trigonally at the corner of the hexagonal first Brillouin zone. We show that as a result of this...
Andreev-Klein reflection in graphene ferromagnet-superconductor junctions (2008)
Zareyan, Malek, Mohammadpour, Hakimeh, Moghaddam, Ali G.
We show that Andreev reflection in a junction between ferromagnetic (F) and superconducting (S) graphene regions is fundamentally different from the common FS junctions. For a weakly doped F graphene...
A Quasi-Spherical Gravitational Wave Solution in Kaluza-Klein Theory (2007)
An exact solution of the source-free Kaluza-Klein field equations is presented. It is a 5D generalization of the Robinson-Trautman quasi-spherical gravitational wave with a cosmological constant. The...
Josephson effect in mesoscopic graphene strips with finite width (2006)
Moghaddam, Ali G., Zareyan, Malek
We study Josephson effect in a ballistic graphene strip of length $L$ smaller than the superconducting coherence length and arbitrary width $W$. We find that the dependence of the critical...
Shot noise of spin current in ferromagnet-normal-metal systems (2005)
Zareyan, Malek, Belzig, Wolfgang
We propose a three-terminal spin-valve setup, to determine experimentally the spin-dependent shot noise, which carries information on the spin-relaxation processes. Based on a spin-dependent...
Semiclassical theory of spin-polarized shot noise in mesoscopic diffusive conductors (2005)
Zareyan, Malek, Belzig, Wolfgang
We study fluctuations of spin-polarized currents in a three-terminal spin-valve system consisting of a diffusive normal metal wire connected by tunnel junctions to three ferromagnetic terminals....
Spin-flip noise in a multiterminal spin valve (2004)
Belzig, Wolfgang, Zareyan, Malek
We study shot noise and cross-correlations in a four terminal spin-valve geometry using a Boltzmann-Langevin approach. The Fano factor (shot noise to current ratio) depends on the magnetic...
Unconventional superconducting states induced in a ferromagnet by a d-wave superconductor (2003)
We develop a quasi-classical theory for the superconducting proximity effect in a ballistic ferromagnetic layer in contact with a d-wave superconductor. In agreement with recent experiments we find...
Superconducting proximity effect in clean ferromagnetic layers (2002)
Zareyan, Malek, Belzig, Wolfgang, Nazarov, Yuli V.
We investigate the superconducting proximity effect in clean ferromagnetic layers with rough boundaries. The subgap density of states is formed by Andreev bound states at energies which depend on...
Oscillations of Andreev states in clean ferromagnetic films (2001)
Zareyan, Malek, Belzig, Wolfgang, Nazarov, Yuli V.
We investigate the influence of the exchange field on the Andreev bound states in a ferromagnetic (F) film backed on one side by a superconductor (S). Our model accounts for diffusive reflection at...
Ballistic Four-Terminal Josephson Junction: Bistable States and Magnetic Flux Transfer (1999)
Omelyanchouk, A. N., Zareyan, Malek
The macroscopic quantum interference effects in ballistic Josephson microstructures are investigated. The studied system consists of four bulk superconductors (terminals) which are weakly coupled...
Zareyan, Malek, Kolesnichenko, Yu. A., Omelyanchouk, A. N.
The microscopic theory of current carrying states in the ballistic superconducting microchannel is presented. The effects of the contact length L on the Josephson current are investigated. For the...
Coherent current states in mesoscopic four-terminal Josephson junction (1998)
Zareyan, Malek, Omelyanchouk, A. N.
A theory is offered for the ballistic 4-terminal Josephson junction. The studied system consists of a mesoscopic two-dimensional normal rectangular layer which is attached in each side to the bulk...
A Quasi-Spherical Gravitational Wave Solution in Kaluza-Klein Theory (1996)
An exact solution of the source-free Kaluza-Klein field equations is presented. It is a 5D generalization of the Robinson-Trautman quasi-spherical gravitational wave with a cosmological constant. The...