ORCID Profile
0000-0001-9572-966X
Current Organisation
Politechnika Wrocławska
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: AIP Publishing
Date: 25-10-2010
DOI: 10.1063/1.3505502
Publisher: American Physical Society (APS)
Date: 20-07-2012
Publisher: American Chemical Society (ACS)
Date: 22-03-2013
DOI: 10.1021/JZ400239K
Abstract: For tracing the spatiotemporal evolution of electronic systems, we suggest and analyze theoretically a setup that exploits the excellent spatial resolution based on scanning tunneling microscopy techniques combined with the temporal resolution of femtosecond pump-probe photoelectron spectroscopy. As an ex le, we consider the laser-induced, local vibrational dynamics of a surface-adsorbed molecule. The photoelectrons released by a laser pulse can be collected by the scanning tip and utilized to access the spatiotemporal dynamics. Our proof-of-principle calculations are based on the solution of the time-dependent Schrödinger equation supported by the ab initio computation of the matrix elements determining the dynamics.
Publisher: American Physical Society (APS)
Date: 22-04-2010
Publisher: IOP Publishing
Date: 23-04-2012
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: American Physical Society (APS)
Date: 14-11-2014
Publisher: American Physical Society (APS)
Date: 30-06-2014
Publisher: American Physical Society (APS)
Date: 15-05-2013
Publisher: Elsevier BV
Date: 04-2016
Publisher: IOP Publishing
Date: 31-12-2014
Publisher: Elsevier BV
Date: 2009
Publisher: IOP Publishing
Date: 04-2011
Publisher: Wiley
Date: 08-03-2010
Publisher: American Physical Society (APS)
Date: 13-04-2015
Publisher: American Physical Society (APS)
Date: 21-03-2008
Publisher: American Physical Society (APS)
Date: 09-05-2012
Publisher: IOP Publishing
Date: 26-09-2012
Publisher: Springer Science and Business Media LLC
Date: 14-08-2020
DOI: 10.1038/S41467-020-17925-8
Abstract: Charge excitations across an electronic band gap play an important role in opto-electronics and light harvesting. In contrast to conventional semiconductors, studies of above-band-gap photoexcitations in strongly correlated materials are still in their infancy. Here we reveal the ultrafast dynamics controlled by Hund’s physics in strongly correlated photoexcited NiO. By combining time-resolved two-photon photoemission experiments with state-of-the-art numerical calculations, an ultrafast (≲10 fs) relaxation due to Hund excitations and related photo-induced in-gap states are identified. Remarkably, the weight of these in-gap states displays long-lived coherent THz oscillations up to 2 ps at low temperature. The frequency of these oscillations corresponds to the strength of the antiferromagnetic superexchange interaction in NiO and their lifetime vanishes slightly above the Néel temperature. Numerical simulations of a two-band t - J model reveal that the THz oscillations originate from the interplay between local many-body excitations and antiferromagnetic spin correlations.
Publisher: Elsevier BV
Date: 02-2013
Publisher: IOP Publishing
Date: 11-2008
Publisher: American Physical Society (APS)
Date: 20-07-2012
Publisher: AIP Publishing
Date: 28-11-2011
DOI: 10.1063/1.3665089
Abstract: We present ab initio calculations of the quasiparticle decay times in a Buckminsterfullerene based on the many-body perturbation theory. A particularly lucid representation arises when the broadening of the quasiparticle states is plotted in the angular momentum (ℓ) and energy (ɛ) coordinates. In this representation the main spectroscopic features of the fullerene consist of two occupied nearly parabolic bands, and delocalized plane-wave-like unoccupied states with a few long-lived electronic states (the superatom molecular orbitals, SAMOs) embedded in the continuum of Fermi-liquid states. SAMOs have been recently uncovered experimentally by Feng et al. [Science 320, 359 (2008)10.1126/science.1155866] using scanning tunneling spectroscopy. The present calculations offer an explanation of their unusual stability and unveil their long-lived nature making them good candidates for applications in the molecular electronics. From the fundamental point of view these states illustrate a concept of the Fock-space localization [B. L. Altshuler, Y. Gefen, A. Kamenev, and L. S. Levitov, Phys. Rev. Lett. 78, 2803 (1997)10.1103/PhysRevLett.78.2803] with properties drastically different from the Fermi-liquid excitations.
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: American Physical Society (APS)
Date: 04-03-2013
No related grants have been discovered for Yaroslav Pavlyukh.