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[PAST EVENT] Physics Colloquium - Dr. Wei Pan
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Dr. Wei Pan, Sandia National Laboratory, Title: Quantum enhanced Josephson junction field effect transistor for microelectronics applications
Abstract: Exploration of novel materials and device architectures is warranted, in order to meet the enormous power-consumption demand for computation, information, and communication. Superconducting electronics is promising for low-energy, power-efficient circuit applications. It has been estimated that the power consumption of superconducting computing could be at least 10 times lower than themost efficient exascale conventional silicon computing for the same performance.
In this talk, I will discuss our recent work on quantum enhanced Josephson junction field-effect transistors (JJFETs). JJFETs are particularly useful for low power microelectronics applications as, in the superconducting regime, they are operated with zero-voltage drop across their source and drain electrodes. The feasibility ofusing JJFETs for Boolean logic operations has also been studied. However, in JJFETs with conventional semiconductor channel, the gain factor (~ 0.001 reported) is too small for logic applications. We show that by replacing the conventional semiconductor channel materials with a novel semiconductor material stack such asInAs/GaSb heterostructures that can undergo quantum phase transition the gain factor can be greatly enhanced. We will also discuss several optimization approaches that may ultimately enable a gain factor larger than 1, needed for logic applications.
Sponsored by: Physics