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Low voltage threshold for negative differential conductance in a superlattice tunnel diode

The authors describe the achievement of negative differential conductance (NDC) in a superlattice tunnel diode with large peak-to-valley ratio in current and valley-to-peak in voltage (7.4:1 and 6.8:1 respectively at 4.5 K). An extremely low onset voltage for NDC 32 mV, is also observed. The considerations involved in the design of the structure are discussed.