Experimental Study of Spectral Properties of a Frenkel-Kontorova System.

M Lucci,M Cirillo,G Salina,A V Ustinov,I Ottaviani,D Winkler,D Badoni,V Merlo

doi:10.1103/physrevlett.115.107002

Abstract

We report on microwave emission from linear parallel arrays of underdamped Josephson junctions, which are described by the Frenkel-Kontorova (FK) model. Electromagnetic radiation is detected from the arrays when biased on current singularities (steps) appearing at voltages V(n)=Φ(0)(nc̅/L), where Φ(0)=2.07×10(-15) Wb is the magnetic flux quantum, and c̅, L, and n are, respectively, the speed of light in the transmission line embedding the array, L its physical length, and n an integer. The radiation, detected at fundamental frequency c̅/2L when biased on different singularities, indicates shuttling of bunched 2π kinks (magnetic flux quanta). Resonance of flux-quanta motion with the small-amplitude oscillations induced in the arrays gives rise to fine structures in the radiation spectrum, which are interpreted on the basis of the FK model describing the resonance. The impact of our results on design and performances of new digital circuit families is discussed.

Highlights

Electromagnetic radiation is detected from the arrays when biased on current singularities (steps) appearing at voltages Vn 1⁄4 Φ0ðnc=LÞ, where Φ0 1⁄4 2.07 × 10−15 Wb is the magnetic flux quantum, and c, L, and n are, respectively, the speed of light in the transmission line embedding the array, L its physical length, and n an integer
We report on microwave emission from linear parallel arrays of underdamped Josephson junctions, which are described by the Frenkel-Kontorova (FK) model
Electromagnetic radiation is detected from the arrays when biased on current singularities appearing at voltages Vn 1⁄4 Φ0ðnc=LÞ, where Φ0 1⁄4 2.07 × 10−15 Wb is the magnetic flux quantum, and c, L, and n are, respectively, the speed of light in the transmission line embedding the array, L its physical length, and n an integer

Summary

Introduction

Electromagnetic radiation is detected from the arrays when biased on current singularities (steps) appearing at voltages Vn 1⁄4 Φ0ðnc=LÞ, where Φ0 1⁄4 2.07 × 10−15 Wb is the magnetic flux quantum, and c, L, and n are, respectively, the speed of light in the transmission line embedding the array, L its physical length, and n an integer.

Results

Conclusion