dc.contributor.author |
Jog, Harshvardhan |
en_US |
dc.contributor.author |
HARNAGEA, LUMINITA |
en_US |
dc.contributor.author |
Mele, Eugene J. |
en_US |
dc.contributor.author |
Agarwal, Ritesh |
en_US |
dc.date.accessioned |
2022-02-25T10:24:45Z |
|
dc.date.available |
2022-02-25T10:24:45Z |
|
dc.date.issued |
2022-02 |
en_US |
dc.identifier.citation |
Science Advances, 8(7). |
en_US |
dc.identifier.issn |
2375-2548 |
en_US |
dc.identifier.uri |
https://doi.org/10.1126/sciadv.abl9020 |
en_US |
dc.identifier.uri |
http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/6601 |
|
dc.description.abstract |
In low–electron density materials, interactions can lead to highly correlated quantum states of matter. Ta2NiSe5, an excitonic insulator (EI) candidate, exists in a novel broken-symmetry phase below 327 K, characterized by robust exchange interaction and electron-lattice coupling. We study this phase of Ta2NiSe5 using the quadrupole circular photogalvanic effect (QCPGE). Light matter interaction in Ta2NiSe5 mediated by electric quadrupole/magnetic dipole coupling produces helicity-dependent DC response even with centrosymmetry, making it particularly sensitive to certain other broken symmetries. We show that the exchange interaction in Ta2NiSe5 can lead to a triclinic structure with a broken C2 symmetry. Our results provide an incisive probe of the symmetries of the low-temperature phase of Ta2NiSe5 and add new symmetry constraints to the identification of a strongly correlated EI phase. The high sensitivity of QCPGE to subtle symmetry breaking in centrosymmetric systems will enable its use in studying other complex crystalline systems. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
American Association for the Advancement of Science |
en_US |
dc.subject |
Physics |
en_US |
dc.subject |
2022-FEB-WEEK4 |
en_US |
dc.subject |
TOC-FEB-2022 |
en_US |
dc.subject |
2022 |
en_US |
dc.title |
Exchange coupling–mediated broken symmetries in Ta2NiSe5 revealed from quadrupolar circular photogalvanic effect |
en_US |
dc.type |
Article |
en_US |
dc.contributor.department |
Dept. of Physics |
en_US |
dc.identifier.sourcetitle |
Science Advances |
en_US |
dc.publication.originofpublisher |
Foreign |
en_US |