A few-electron quadruple quantum dot in a closed loop

Romain Thalineau (1) , Sylvain Hermelin (1) , Andreas Wieck , Christopher Bäuerle (1) , Laurent Saminadayar (2) , Tristan Meunier (1)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 NEEL - TPS - Thermodynamique et biophysique des petits systèmes

We report the realization of a quadruple quantum dot device in a square-like configuration where a single electron can be transferred on a closed path free of other electrons. By studying the stability diagrams of this system, we demonstrate that we are able to reach the few-electron regime and to control the electronic population of each quantum dot with gate voltages. This allows us to control the transfer of a single electron on a closed path inside the quadruple dot system. This work opens the route towards electron spin manipulation using spin-orbit interaction by moving an electron on complex paths free of electrons

Mots clés: semiconductor quantum dots; III-V semiconductors; gallium arsenide; single electron devices; spin-orbit interactions

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Romain Thalineau, Sylvain Hermelin, Andreas Wieck, Christopher Bäuerle, Laurent Saminadayar, et al.. A few-electron quadruple quantum dot in a closed loop. Applied Physics Letters, 2012, 101 (10), pp.103102. ⟨10.1063/1.4749811⟩. ⟨hal-00728052⟩