A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Electronic transport in molecular junctions : The generalized Kadanoff–Baym ansatz with initial contact and correlations (2021)
Tuovinen, R., van Leeuwen, R., Perfetto, E., & Stefanucci, G. (2021). Electronic transport in molecular junctions : The generalized Kadanoff–Baym ansatz with initial contact and correlations. Journal of Chemical Physics, 154(9), Article 094104. https://doi.org/10.1063/5.0040685
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Tuovinen, Riku; van Leeuwen, Robert; Perfetto, Enrico; Stefanucci, Gianluca
Lehti tai sarja: Journal of Chemical Physics
ISSN: 0021-9606
eISSN: 1089-7690
Julkaisuvuosi: 2021
Ilmestymispäivä: 07.03.2021
Volyymi: 154
Lehden numero: 9
Artikkelinumero: 094104
Kustantaja: AIP Publishing
Julkaisumaa: Yhdysvallat (USA)
Julkaisun kieli: englanti
DOI: https://doi.org/10.1063/5.0040685
Julkaisun avoin saatavuus: Ei avoin
Julkaisukanavan avoin saatavuus:
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/80376
Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/2012.08247
Tiivistelmä
The generalized Kadanoff–Baym ansatz (GKBA) offers a computationally inexpensive approach to simulate out-of-equilibrium quantum systems within the framework of nonequilibrium Green’s functions. For finite systems, the limitation of neglecting initial correlations in the conventional GKBA approach has recently been overcome [Karlsson et al., Phys. Rev. B 98, 115148 (2018)]. However, in the context of quantum transport, the contacted nature of the initial state, i.e., a junction connected to bulk leads, requires a further extension of the GKBA approach. In this work, we lay down a GKBA scheme that includes initial correlations in a partition-free setting. In practice, this means that the equilibration of the initially correlated and contacted molecular junction can be separated from the real-time evolution. The information about the contacted initial state is included in the out-of-equilibrium calculation via explicit evaluation of the memory integral for the embedding self-energy, which can be performed without affecting the computational scaling with the simulation time and system size. We demonstrate the developed method in carbon-based molecular junctions, where we study the role of electron correlations in transient current signatures.
YSO-asiasanat: kvanttifysiikka
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2021
JUFO-taso: 1