De-Dimerization Effect and Persistent Current in Mesoscopic Organic Polymer Rings

概要

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In the framework of the Su-Shrieffer-Heeger (SSH) model, we investigate the effect of Aharonov-Bohna (AB) fltrx on the dimerization of uauesoscopic organic polymer rings. It is shoxvn that anapplied AB flux in some flux windows is able to overconae tlae Peierls instability iua rnesoscopicorganic polymer rings in the reasonably xveak electron-phonon coupling regime. The cotrpling-strength and rung-snze dependence of the window size in both laalf'-filled and doped rings areexploited. Tlae nattrre of the excitations axvay frorn half-filling is disctmssed in the weak couplingregime where there is a de-ditmerization wnndow as xvell as in the strong coupling regime wheredimerization prevail at all valtaes of the fltrx. Tlae plausibility to observe the de-dirnerizatioraeffect azud the persistent current in polyraaer rings is also addressed.
社団法人日本物理学会の論文
1997-08-15