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Natural atomic superlattices are formed in certain strongly anisotropiclayered compound. Here we study interlayer transport in single crystals ofBi2Sr2CaCu2O8 cuprates, which represent stacks of atomic scale intrinsicJosephson junctions. A series of resonant dips in conductance is observed atcondition when bremsstrahlung and recombination bands in non-equilibriumspectrum of Josephson junctions overlap. The phenomenon is explained in termsof self-detection of a new type of collective strongly non-equilibrium state instacked Josephson junctions, bearing certain resemblance with operation of aQuantum Cascade Laser. Conclusions are supported by in-situgeneration-detection experiments, providing evidence for cascade amplificationof recombination radiation, and by numerical simulations.Comment: 12 pages, 5 figure

physical review letters

Quantum Cascade Phenomenon in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>Single Crystals

Quantum Cascade Phenomenon inBi2Sr2CaCu2O8+δSingle Crystals