Point contact readout for a quantum dot terahertz sensor

Pelling, S.; Davis, R.; Kulik, L.; Tzalenchuk, A.; Kubatkin, S.; Ueda, T.; Komiyama, S.; Antonov, V. N.
August 2008
Applied Physics Letters;8/18/2008, Vol. 93 Issue 7, p073501
Academic Journal
We introduce a terahertz radiation sensor in which the photon-induced ionization state of a quantum dot is monitored by a point contact formed in the same semiconductor heterostructure. For comparison we used a readout based on a single electron transistor coupled to the same quantum dot. The experiments prove functionality of the point contact-based device with additional practical advantage of a higher operation temperature up to 1.5 K and ease of nanofabrication.


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