Transient carrier dynamics in a Mott insulator with antiferromagnetic order

Eiki Iyoda, Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We study transient dynamics of hole carriers injected into a Mott insulator with antiferromagnetic long-range order. This "dynamical hole doping" contrasts with chemical hole doping. The theoretical framework for the transient carrier dynamics is presented based on the two-dimensional t-J model. The time dependencies of the optical conductivity spectra, as well as the one-particle excitation spectra, are calculated based on the Keldysh Green's function formalism at zero temperature combined with the self-consistent Born approximation. In the early stage after dynamical hole doping, the Drude component appears, and then incoherent components originating from hole-magnon scattering start to grow. Fast oscillatory behavior owing to coherent magnon and slow relaxation dynamics are confirmed in the spectra. The time profiles are interpreted as doped bare holes being dressed by magnon clouds and relaxed into spin polaron quasiparticle states. The characteristic relaxation times for Drude and incoherent peaks strongly depend on the momentum of the dynamically doped hole and the exchange constant. Implications for recent pump-probe experiments are discussed.

Original languageEnglish
Article number125126
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number12
DOIs
Publication statusPublished - 2014 Mar 27

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Transient carrier dynamics in a Mott insulator with antiferromagnetic order'. Together they form a unique fingerprint.

Cite this