Coherent superposition of photon- and phonon-assisted tunneling in coupled quantum dots

被引：70

作者：

Qin, H

Holleitner, AW

Eberl, K

Blick, RH

机构：

[1] Univ Munich, Ctr Nanosci, D-80539 Munich, Germany

[2] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.64.241302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on electron transport through an artificial molecule formed by two tunnel coupled quantum dots, which are laterally confined in a two-dimensional electron system of an AlxGa1-xAs/GaAs heterostructure. Coherent molecular states in the coupled dots are probed by photon-assisted tunneling (PAT). Above 10 GHz, we observe clear PAT as a result of the resonance between the microwave photons and the molecular states. Below 8 GHz, a pronounced superposition of phonon- and photon-assisted tunneling is observed. Coherent superposition of molecular states persists under excitation of acoustic phonons.

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