2013/05/30 by Adem Ergül, Jack Lidmar, Jan Johansson +4 · 3 citations
Physics and Astronomy · #Condensed matter physics #Coulomb #Coulomb blockade #Electron #Josephson effect #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Pi Josephson junction #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Quantum tunnelling #Semiconductor Quantum Structures and Devices #Superconductivity #Voltage #Zero (linguistics) #cond-mat.mes-hall
paper · pdf · doi:10.1088/1367-2630/15/9/095014
arxiv created 2013/05/30 · openalex publication_date 2013/09/25 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We studied quantum phase-slip (QPS) phenomena in long one-dimensional Josephson junction series arrays with tunable Josephson coupling. These chains were fabricated with as many as 2888 junctions, where one sample had a separately tunable link in the middle of the chain. Measurements were made of the zero-bias resistance, R 0 , as well as current–voltage characteristics (IVC). The finite R 0 is explained by QPS and shows an exponential dependence on with a distinct change in the exponent at R 0 = R Q = h /4 e 2 . When R 0 > R Q , the IVC clearly shows a remnant of the Coulomb blockade, which evolves to a zero-current state with a sharp critical voltage as E J is tuned to a smaller value. The zero-current state below the critical voltage is due to coherent QPSs and we show that these are enhanced when the central link is weaker than all other links. Above the critical voltage, a negative, differential resistance is observed, which nearly restores the zero-current state.