Heat current and spin current through a carbon-nanotube-based molecular quantum pump

Title Heat current and spin current through a carbon-nanotube-based molecular quantum pump

Adiabatic quantum pump of spin-polarized current.

We propose a mechanism by which an open quantum dot driven by two ac (radio frequency) gate voltages in the presence of a moderate in-plane magnetic field generates a spin-polarized, phase-coherent dc current. The idea combines adiabatic, nonquantized (but coherent) pumping through periodically modulated external parameters and the strong fluctuations of the electron wave function existent in c...

Molecular Dynamics of Heat Conduction through Carbon Nanotube

The heat conduction along a single walled carbon nanotube (SWNT)[1-4] was simulated by the molecular dynamics method with the Tersoff-Brenner bond order potential [5,6]. One of the purposes of this study is to clarify the thermal conductivity of carbon nanotubes, which is speculated to be higher than any other material along the cylindrical axis. Very recently, measurements of thermal conductiv...

Resonant spin current in nanotube double junctions

Zero bias conductance per spin of nanotube double junction (NTDJ) is investigated theoretically using the tight binding model, unrestricted Hartree-Fock approximation and non-equilibrium Green’s functions. NTDJ consists of two metallic nanotubes joined by a piece of semiconducting nanotube, with the transition between the nanotubes made up of sets of 5 and 7 member carbon rings. A quantum well ...

Spin transport across carbon nanotube quantum dots

We investigate linear and nonlinear transport in interacting single-wall carbon nanotubes (SWCNTs) that are weakly attached to ferromagnetic leads. For the reduced density matrix of a SWCNT quantum dot, equations of motion which account for an arbitrarily vectored magnetisation of the contacts are derived. We focus on the case of large diameter nanotubes where exchange effects emerging from sho...