Supercluster of Electrons in Ultrathin TaSe_2 Nanocrystals(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

論文の詳細を見る
We discover a supercluster of electrons in the ultrathin TaSe_2 crystals synthesized by our developed de-chalcogenide method. The supercluster has an unexpected structure containing 61 electrons denoted by √<61>×√<61>, in addition to a √<49>×√<49> supercluster based on √<7>×√<7> clusters expected in triangle lattices. This new hierarchal structure and successive clustering cannot be explained by a conventional electron clustering mechanism assisted by background lattice distortions, i.e., charge-density-wave formation mechanism based on Fermi surface nesting. We propose an alternative possible formation mechanism based on saddle-point nesting, taking into account a trigonal symmetry as well as lattice distortion energy.
社団法人日本物理学会の論文
2006-02-15