Comparative study of many-body perturbation theory and time-dependent density functional theory in the out-of-equilibrium Anderson model

A. M. Uimonen, E. Khosravi, A. Stan, G. Stefanucci, S. Kurth, R. Van Leeuwen, E. K.U. Gross

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء

ملخص

We study time-dependent electron transport through an Anderson model. The electronic interactions on the impurity site are included via the self-energy approximations at Hartree-Fock (HF), second Born (2B), GW, and T-matrix levels as well as within a time-dependent density functional (TDDFT) scheme based on the adiabatic Bethe-ansatz local density approximation (ABALDA) for the exchange-correlation potential. The Anderson model is driven out of equilibrium by applying a bias to the leads, and its nonequilibrium dynamics is determined by real-time propagation. The time-dependent currents and densities are compared to benchmark results obtained with the time-dependent density matrix renormalization group (tDMRG) method. Many-body perturbation theory beyond HF gives results in close agreement with tDMRG, especially within the 2B approximation. We find that the TDDFT approach with the ABALDA approximation produces accurate results for the densities on the impurity site, but overestimates the currents. This problem is found to have its origin in an overestimation of the lead densities, which indicates that the exchange-correlation potential must attain nonzero values in the leads.

اللغة الأصليةإنجليزيّة أمريكيّة
رقم المقال115103
دوريةPhysical Review B - Condensed Matter and Materials Physics
مستوى الصوت84
رقم الإصدار11
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - 9 سبتمبر 2011
منشور خارجيًانعم

All Science Journal Classification (ASJC) codes

  • !!Electronic, Optical and Magnetic Materials
  • !!Condensed Matter Physics

بصمة

أدرس بدقة موضوعات البحث “Comparative study of many-body perturbation theory and time-dependent density functional theory in the out-of-equilibrium Anderson model'. فهما يشكلان معًا بصمة فريدة.

قم بذكر هذا