Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-06-30
Phys. Rev. Lett. 81 (19), 4240 (1998)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Final version accepted to Phys. Rev. Lett. (Longer version is available from http://ctp.snu.ac.kr/~choims/)
Scientific paper
10.1103/PhysRevLett.81.4240
We investigate the quantum phase transitions in two capacitively coupled chains of ultra-small Josephson-junctions, with emphasis on the external charge effects. The particle-hole symmetry of the system is broken by the gate voltage applied to each superconducting island, and the resulting induced charge introduces frustration to the system. Near the maximal-frustration line, where the system is transformed into a spin-1/2 Heisenberg antiferromagnetic chain, cotunneling of the particles along the two chains is shown to play a major role in the transport and to drive a quantum phase transition out of the charge-density wave insulator, as the Josephson-coupling energy is increased. We also argue briefly that slightly off the symmetry line, the universality class of the transition remains the same as that right on the line, still being driven by the particle-hole pairs.
Choi Mahn-Soo
Choi Min-Young
Choi Taeseung
Lee Sung-Ik
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