Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.11: Vortrag

Donnerstag, 25. März 2010, 12:15–12:30, H21

Small charge solitons in 1D arrays of Josephson junctions — •Alexander Shnirman¹, Stephan Rachel², Jens Homfeld¹, and Ivan Protopopov¹ — ¹Institut für Theorie der Kondensierten Materie and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology, Karlsruhe, Germany — ²Department of Phyiscs, Yale University, New Haven, USA

We identify the new parameter regime within the Coulomb blockade (insulating) phase of a 1D array of coupled JJs. It is defined by the condition Λ E_J > E_C > E_J, where E_C and E_J are the charging and the Josephson energies of the junction, respectivly, and Λ is the bare screening length (measured in number of junctions). In this regime we investigate the dynamics of charge solitons and demonstrate two surprising features: i) flattening of the dispersion relation in the outer region of the Brillouin zone; ii) broadening of the soliton in the flat band regime in contrast to the expected and observed Lorenz contraction in the regime of regular dispersion relation.