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22 papers · 2 filters
Transport through a single Anderson impurity coupled to one normal and two superconducting leads
Akira Oguri, Yoichi Tanaka
We study the interplay between the Kondo and Andreev-Josephson effects in a quantum dot coupled to one normal and two superconducting (SC) leads. In the large gap limit, the low-en…
Instabilities of the AA-stacked graphene bilayer
A. L. Rakhmanov, A. V. Rozhkov, A. O. Sboychakov +1
Tight-binding calculations predict that the AA-stacked graphene bilayer has one electron and one hole conducting bands, and that the Fermi surfaces of these bands coincide. We demo…
Detection of picosecond magnetization dynamics of 50 nm magnetic dots down to the single dot regime
Bivas Rana, Dheeraj Kumar, Saswati Barman +4
We report an all-optical time-domain detection of picosecond magnetization dynamics of arrays of 50 nm Ni80Fe20 (permalloy) dots down to the single nanodot regime. In the single na…
Charge pumping by magnetization dynamics in magnetic and semi-magnetic tunnel junctions with interfacial Rashba or bulk extrinsic spin-orbit couplings
Farzad Mahfouzi, Jaroslav Fabian, Naoto Nagaosa +1
We develop a time-dependent nonequilibrium Green function (NEGF) approach to the problem of spin pumping by precessing magnetization in one of the ferromagnetic layers within F/I/F…
Phase separation of hydrogen atoms adsorbed on graphene and the smoothness of the graphene-graphane interface
A. L. Rakhmanov, A. V. Rozhkov, A. O. Sboychakov +1
The electronic properties of a graphene sheet with attached hydrogen atoms is studied using a modified Falicov-Kimball model on the honeycomb lattice. It is shown that in the groun…
Global phase diagram of two-dimensional Dirac fermions in random potentials
Shinsei Ryu, Christopher Mudry, Andreas Ludwig +1
Anderson localization is studied for two flavors of massless Dirac fermions in 2D space perturbed by static disorder that is invariant under a chiral symmetry (chS) and a time-reve…