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Resonant electromagnetic emission from intrinsic Josephson-junction stacks with laterally modulated Josephson critical current
 

Summary: Resonant electromagnetic emission from intrinsic Josephson-junction stacks with laterally
modulated Josephson critical current
A. E. Koshelev
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
L. N. Bulaevskii
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Received 5 September 2007; revised manuscript received 20 November 2007; published 30 January 2008
Intrinsic Josephson-junction stacks realized in mesas fabricated out of high-temperature superconductors
may be used as sources of coherent electromagnetic radiation in the terahertz range. The major challenge is to
synchronize Josephson oscillations in all junctions in the stack to get significant radiation out of the crystal
edge parallel to the c axis. We suggest a simple way to solve this problem via artificially prepared lateral
modulation of the Josephson critical current identical in all junctions. In such a stack, phase oscillations excite
the in-phase Fiske mode when the Josephson frequency matches the Fiske-resonance frequency which is set by
the stack lateral size. The powerful, almost standing electromagnetic wave is excited inside the crystal in the
resonance. This wave is homogeneous across the layers, meaning that the oscillations are synchronized in all
junctions in the stack. We evaluate behavior of the I-V characteristics and radiated power near the resonance
for arbitrary modulation and find exact solutions for several special cases corresponding to symmetric and
asymmetric modulations of the critical current.
DOI: 10.1103/PhysRevB.77.014530 PACS number s : 74.50. r, 85.25.Cp, 74.81.Fa, 74.72.Hs
I. INTRODUCTION

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics