A quantum many-body density matrix model for sub-femtosecond transport in mesoscopic structures

Irena Knezevic, David K. Ferry

Research output: Contribution to journalArticle

Abstract

Transient regime relaxation in nanostructures is governed by the two-way information exchange between the active region and the contacts. In this paper, we introduce a second order quantum master equation for the active region's many-body reduced density matrix, which includes the information exchange between the active region and the contacts, while eliminating the contacts explicitly from the simulation. For the case of a resonant-tunneling diode, the master equation is solved numerically. Proper injection from/into the contacts is obtained, and natural oscillations of the current and the number of particles in the well are observed, with a frequency in the mid-terahertz regime.

Original languageEnglish (US)
Pages (from-to)359-362
Number of pages4
JournalJournal of Computational Electronics
Volume3
Issue number3-4
DOIs
StatePublished - Oct 1 2004

Keywords

  • Contacts
  • Density matrix
  • Femtosecond
  • Many-body
  • Open system
  • Quantum transport
  • Relaxation
  • Transient regime

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Electrical and Electronic Engineering

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