Phonon-Mediated versus Coulombic Backaction in Quantum Dot Circuits

被引：32

作者：

Harbusch, D. ^{[1
,2
]}

Taubert, D. ^{[1
,2
]}

Tranitz, H. P. ^{[3
]}

Wegscheider, W. ^{[4
]}

Ludwig, S. ^{[1
,2
]}

机构：

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

[2] Univ Munich, Fak Phys, D-80539 Munich, Germany

[3] Univ Regensburg, Inst Expt Phys, D-93040 Regensburg, Germany

[4] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 19期

关键词：

ELECTRONS; NOISE;

D O I：

10.1103/PhysRevLett.104.196801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum point contacts (QPCs) are commonly employed to detect capacitively the charge state of coupled quantum dots (QDs). An indirect backaction of a biased QPC onto a double QD laterally defined in a GaAs/AlGaAs heterostructure is observed. Energy is emitted by nonequilibrium charge carriers in the leads of the biased QPC. Part of this energy is absorbed by the double QD where it causes charge fluctuations that can be observed under certain conditions in its stability diagram. By investigating the spectrum of the absorbed energy, we find that both acoustic phonons and Coulomb interaction can be involved in the backaction, depending on the geometry and coupling constants.

引用

页数：4

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