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Naslov:Orbital selective dynamics in Fe-pnictides triggered by polarized pump pulse excitations
Avtorji:ID Adhikary, Ganesh (Avtor)
ID Saha, Tanusree (Avtor)
ID Rebernik Ribič, Primož (Avtor)
ID Stupar, Matija (Avtor)
ID Ressel, Barbara (Avtor)
ID Urbančič, Jurij (Avtor)
ID De Ninno, Giovanni (Avtor)
ID Thamizhavel, A. (Avtor)
ID Maiti, Kalobaran (Avtor)
Datoteke:.pdf Adhikary+et+al_2021_EPL_10.1209_0295-5075_ac2dc0.pdf (9,56 MB)
MD5: 782F15ECC19FCB560B9C25E730CF47B7
 
Jezik:Angleški jezik
Vrsta gradiva:Neznano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:Quantum materials display exotic behaviours related to the interplay between temperature-driven phase transitions. Here, we study the electron dynamics in one such material, CaFe$_2$As$_2$, a parent Fe-based superconductor, employing time and angle-resolved photoemission spectroscopy. CaFe$_2$As$_2$ 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 ($\alpha$, $\beta$ and $\gamma$) around $\Gamma$-point and two electron pockets around $X$-point. The hole pockets have $d_{xy}$, $d_{yz}$ and $d_{zx}$ orbital symmetries. The $\beta$ band constituted by $d_{xz}$/$d_{yz}$ 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 ($\alpha$,$\beta$) 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 ($\sim$ 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.
Ključne besede:Electronic structure, Pnictides and chalcogenides, Time-resolved spectroscopy
Leto izida:2021
Št. strani:str. 1-6
Številčenje:Vol. 136, no. 1
PID:20.500.12556/RUNG-6863 Novo okno
COBISS.SI-ID:80409859 Novo okno
UDK:53
ISSN pri članku:0295-5075
DOI:10.1209/0295-5075/ac2dc0 Novo okno
NUK URN:URN:SI:UNG:REP:XFFPWLPE
Datum objave v RUNG:13.10.2021
Število ogledov:2066
Število prenosov:6
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Gradivo je del revije

Naslov:Europhysics letters
Skrajšan naslov:Europhys. lett.
Založnik:Les Ed. de physique
ISSN:0295-5075
COBISS.SI-ID:25434880 Novo okno

Gradivo je financirano iz projekta

Financer:EC - European Commission
Program financ.:H2020
Akronim:NFFA and DIMAG

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:13.10.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:electronic structure, pnictides, chalcogenides, time-resolved spectroscopy


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