Transport Through Nanostructures with Asymmetric Coupling to the Leads

Details Transport Through Nanostructures with Asymmetric Coupling to the Leads Transport Through Nanostructures with Asymmetric Coupling to the Leads

2010-07-29

arxiv.org/abs/1007.5247v1

Phys. Rev. B 82, 165437 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to Phys. Rev. B

Scientific paper

Using an approach to open quantum systems based on the effective non-Hermitian Hamiltonian, we fully describe transport properties for a paradigmatic model of a coherent quantum transmitter: a finite sequence of square potential barriers. We consider the general case of asymmetric external barriers and variable coupling strength to the environment. We demonstrate that transport properties are very sensitive to the degree of opening of the system and determine the parameters for maximum transmission at any given degree of asymmetry. Analyzing the complex eigenvalues of the non-Hermitian Hamiltonian, we show a double transition to a super-radiant regime where the transport properties and the structure of resonances undergo a strong change. We extend our analysis to the presence of disorder and to higher dimensions.

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