Elementary excitations in the Δ chain

Tota Nakamura, Kenn Kubo

研究成果: Article査読

101 被引用数 (Scopus)

抄録

We clarify elementary excitations in the Δ chain. They are found to be “kink”-“antikink”-type domain wall excitations to the dimer singlet ground state. The characters of a kink and an antikink are quite different in this system: a kink has no excitation energy and is localized, while an antikink has a finite excitation energy and propagates. The excitation energy of a kink-antikink pair consists of a finite-energy gap and a kinetic energy due to the free motion of the antikink. Variational wave functions for an antikink are studied to clarify its propagating states. All the numerical results are explained consistently based on this picture. At finite temperatures, thermally excited antikinks are moving in regions bounded by localized kinks. The origin of the low-temperature peak in the specific heat reported previously is explained and the peak position in the thermodynamic limit is estimated.

本文言語English
ページ(範囲)6393-6400
ページ数8
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
53
10
DOI
出版ステータスPublished - 1996
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Elementary excitations in the Δ chain」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル