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Title:Orbital selective dynamics in Fe-pnictides triggered by polarized pump pulse excitations
Authors:ID Adhikary, Ganesh (Author)
ID Saha, Tanusree (Author)
ID Rebernik Ribič, Primož (Author)
ID Stupar, Matija (Author)
ID Ressel, Barbara (Author)
ID Urbančič, Jurij (Author)
ID De Ninno, Giovanni (Author)
ID Thamizhavel, A. (Author)
ID Maiti, Kalobaran (Author)
Files:.pdf Adhikary+et+al_2021_EPL_10.1209_0295-5075_ac2dc0.pdf (9,56 MB)
MD5: 782F15ECC19FCB560B9C25E730CF47B7
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Quantum materials display exotic behaviours related to the interplay between temperature-driven phase transitions. Here, we study the electron dynamics in one such material, CaFe2As2, a parent Fe-based superconductor, employing time and angle-resolved photoemission spectroscopy. CaFe2As2 exhibits concomitant transition to spin density wave state and tetragonal to orthorhombic structure below 170 K. The Fermi surface of this material consists of three hole pockets (α, β and γ) around Γ-point and two electron pockets around X-point. The hole pockets have dxy, dyz and dzx orbital symmetries. The β band constituted by dxz/dyz orbitals exhibit a gap across the magnetic phase transition. We discover that polarized pump pulses can induce excitations of electrons of a selected symmetry. More specifically, while s-polarized light (polarization vector perpendicular to the xz-plane) excites electrons corresponding to all the three hole bands, p-polarized light excites electrons essentially from (α,β) bands which are responsible for magnetic order. Interestingly, within the magnetically ordered phase, the excitation due to the p-polarized pump pulses occur at a time scale of 50 fs, which is significantly faster than the excitation induced by s-polarized light (∼ 200 fs). These results suggest that the relaxation of different ordered phases occurs at different time scales and this method can be used to achieve selective excitations to disentangle complexity in the study of quantum materials.
Keywords:Electronic structure, Pnictides and chalcogenides, Time-resolved spectroscopy
Year of publishing:2021
Number of pages:str. 1-6
Numbering:Vol. 136, no. 1
PID:20.500.12556/RUNG-6863 New window
COBISS.SI-ID:80409859 New window
UDC:53
ISSN on article:0295-5075
DOI:10.1209/0295-5075/ac2dc0 New window
NUK URN:URN:SI:UNG:REP:XFFPWLPE
Publication date in RUNG:13.10.2021
Views:3311
Downloads:9
Metadata:XML DC-XML DC-RDF
:
ADHIKARY, Ganesh, SAHA, Tanusree, REBERNIK RIBIČ, Primož, STUPAR, Matija, RESSEL, Barbara, URBANČIČ, Jurij, DE NINNO, Giovanni, THAMIZHAVEL, A. and MAITI, Kalobaran, 2021, Orbital selective dynamics in Fe-pnictides triggered by polarized pump pulse excitations. Europhysics letters [online]. 2021. Vol. 136, no. 1, p. 1–6. [Accessed 21 April 2025]. DOI 10.1209/0295-5075/ac2dc0. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=6863
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Record is a part of a journal

Title:Europhysics letters
Shortened title:Europhys. lett.
Publisher:Les Ed. de physique
ISSN:0295-5075
COBISS.SI-ID:25434880 New window

Document is financed by a project

Funder:EC - European Commission
Funding programme:H2020
Acronym:NFFA and DIMAG

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:13.10.2021

Secondary language

Language:Slovenian
Keywords:electronic structure, pnictides, chalcogenides, time-resolved spectroscopy


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