Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-02-04
Phys. Rev. Lett. 101, 066804 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 6 figures
Scientific paper
10.1103/PhysRevLett.101.066804
We propose a numerical renormalization group (NRG) approach to steady-state currents through nano-devices. A discretization of the scattering-states continuum ensures the correct boundary condition for an open quantum system. We introduce two degenerate Wilson chains for current carrying left and right-moving electrons reflecting time-reversal symmetry in the absence of a finite bias $V$. We employ the time-dependent NRG to evolve the known steady-state density operator for a non-interacting junction into the density operator of the fully interacting nano-device at finite bias. We calculate the temperature dependent current as function of $V$ and applied external magnetic field using a recently developed algorithm for non-equilibrium spectral functions.
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