Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.057002
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- JST/DFG strategic Japanese-German International Cooperative Program
- JSPS
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We report on THz emission measurements and low temperature scanning laser imaging of Bi(2)Sr(2)CaCu(2)O(8) intrinsic Josephson junction stacks. Coherent emission is observed at large dc input power, where a hot spot and a standing wave, formed in the cold'' part of the stack, coexist. By changing bias current and bath temperature, the emission frequency can be varied by more than 40%; the variation matches the Josephson-frequency variation with voltage. The linewidth of radiation is much smaller than expected from a purely cavity-induced synchronization. Thus, an additional mechanism seems to play a role. Some scenarios, related to the presence of the hot spot, are discussed.
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