Kink-solitons in quantum-dot cellular automata

S. Nakagawa, M. Eto, K. Kawamura

Research output: Contribution to journalArticlepeer-review


We examine the propagation of electric polarization in quantum-dot cellular automata (QCA) as a kink-soliton. We solve the time-dependent Schrödinger equation numerically by the Hartree approximation and also by the exact method. By the Hartree approximation, we find that the shape of the kink-soliton can be fitted very well to a function of hyperbolic tangent, which coincides with the solution of the nonlinear wave equation obtained in the continuum limit. At the junction between different kinds of QCA, the soliton is perfectly transmitted or reflected, like a classical particle. The exact calculations yield different behaviors of kink-solitons at the junction; partly transmitted and partly reflected, similar to a quantum wave packet.

Original languageEnglish
Pages (from-to)538-545
Number of pages8
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number2 A
Publication statusPublished - 2001 Feb


  • Coulomb blockade
  • Kink-soliton
  • Nonlinear wave equation
  • QCA
  • Quantum dot
  • Quantum-dot cellular automata

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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