Resonant tunneling through linear arrays of quantum dots

Resonant tunneling through linear arrays of quantum dots

We theoretically investigate resonant tunneling through a linear array of quantum dots with subsequent tunnel coupling. We consider two limiting cases: ~i! the strong Coulomb blockade, where only one extra electron can be present in the array; ~ii! the limit of almost noninteracting electrons. We develop a densitymatrix description that incorporates the coupling of the dots to reservoirs. We an...

Resonant tunneling through quantum-dot arrays.

Geometric broadening in resonant tunneling through Si quantum dots

The current through a resonant tunneling diode consisting of Si quantum dots embedded in a SiO2 matrix is calculated and the resonance broadening effects caused by distributions of quantum dot diameter and asymmetric barrier thicknesses are simulated. It is demonstrated that a size distribution is extremly critical for the use of these structures as selective energy contacts for hot carrier sol...

Resonant tunneling in graphene pseudomagnetic quantum dots.

Realistic relaxed configurations of triaxially strained graphene quantum dots are obtained from unbiased atomistic mechanical simulations. The local electronic structure and quantum transport characteristics of y-junctions based on such dots are studied, revealing that the quasi-uniform pseudomagnetic field induced by strain restricts transport to Landau level- and edge state-assisted resonant ...

Conductance in quantum wires by three quantum dots arrays

A noninteracting quantum-dot arrays side coupled to a quantum wire is studied. Transport through the quantum wire is investigated by using a noninteracting Anderson tunneling Hamiltonian. The conductance at zero temperature develops an oscillating band with resonances and antiresonances due to constructive and destructive interference in the ballistic channel, respectively. Moreover, we have fo...