Instituto de Ciencia de Materiales de Madrid
     Condensed Matter Theory    
   Sigmund Kohler home | cv | research | publications  

Phonon-mediated decoherence in triple quantum dot interferometers

Fernando Domínguez, Sigmund Kohler, and Gloria Platero
Phys. Rev. B 83, 235319 (2011)

We investigate decoherence in a triple quantum dot in a ring configuration, in which one dot is coupled to a damped phonon mode while the other two dots are connected to a source and a drain, respectively. In the absence of decoherence, single-electron transport may get blocked by an electron falling into a superposition decoupled from the drain; this is known as a dark state. Phonon-mediated decoherence affects this superposition and leads to a finite current. We study the current and its shot noise numerically within a master equation approach for the electrons and the dissipative phonon mode. A polaron transformation allows us to obtain a reduced equation for only the dot electrons, which provides analytical results in agreement with numerical ones.
arXiv:1103.6228 [cond-mat]

[ICMM-CSIC] [Condensed Matter Theory]
last modified: 18.6.2018 by Sigmund Kohler