A quantum dot as a sensitive terahertz detector

作者：Hashiba H^*; Das B; Nicholls J T; Antonov V; Kulik L; Komiyama S

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2006, 34(1-2): 644-646.

DOI：10.1016/j.physe.2006.03.049

• quantum dot
• terahertz
• Coulomb blockade

The formation of 1 mu m-diameter quantum dot (QD), defined by mesa patterning and metal gates in a GaAs/AlGaAs heterostructure, is studied using a capacitively coupled aluminium single-electron transistor (SET). The SET senses the charge of the QD at different gate potentials and can identify stable and metastable states of the QD. An electrostatic model gives a good description of the stable states, leaving, however, some unanswered questions concerning the metastable states. The application of the device for the sensitive detection of terahertz radiation is discussed.

• 出版日期2006-8