arXiv subjects

H. Seppä

Publications and source records attributed to H. Seppä.

2 recordsLinked to original sources

arXiv2008

Superconducting transition detector in power amplification mode: a tool for cryogenic multiplexing

We demonstrate that substantial power gain can be obtained with superconducting transition detectors. We describe the properties of the detector as a power amplifier theoretically. In our first experiments power gain of 23 was reached in a good agreement with the theory. The gain facilitates noise matching of the readout circuit to the detectors in the case of time division multiplexing.

cond-mat.supr-con↗

arXiv2003

The Bloch Oscillating Transistor

We introduce a new mesoscopic transistor, which consists of a superconducting island connected to superconducting and normal electrodes via two mesoscopic tunnel junctions. Furthermore, the island is being charged through a resistor. The interplay between Bloch oscillations, single-electron effects and ohmic current leads to a device having a high current gain. The operation and characteristics of the transistor are analyzed with a numerical model.

cond-mat.mes-hall↗