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Angle-resolved photoemission spectroscopy study of a system with a double charge density wave transition: ErTe3

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Abstract
The electronic structures of ErTe3, having double charge density wave (CDW) transitions, have been investigated
by performing polarization- and temperature (T )-dependent angle-resolved photoemission spectroscopy
(ARPES) and Er 4d → 4 f resonant PES measurements for high-quality single crystals. It is found that Er
4 f electrons do not contribute directly to CDW formation. The shadow Fermi surfaces (FSs) are clearly
observed, arising from band folding due to the interlayer interaction. Twofold symmetric FS, but with weak
FS reconstruction, is observed in the CDW phase of ErTe3, which is similar to that of PrTe3 having the CDW
modulation vector Q ? 5/7 c? ? 5/7 a?. Very good agreement is found between the constant energy maps and
ARPES measured in the CDWphase and the density functional theory band calculation for the non-CDWphase,
implying very weak and only partial CDW-induced FS reconstruction in ErTe3. Very weak and similar circular
dichroism is observed along different symmetry lines in both FS and ARPES, suggesting weak chiral orbital
and spin polarizations in the Te 5p orbitals. T -dependent FS and ARPES measurements reveal closing of the
CDW gap on heating but no clear changes across TCDW2 and TCDW1, supporting the very weak CDW distortion in
ErTe3. The origin of the very weak CDW reconstruction in ErTe3 is likely to be the small ionic sizes of Er ions
and the concomitant small volume that give rise to the imperfect FS nesting and the reduced density of states
at the Fermi level. The very weak FS reconstruction at the first CDW transition along c? is considered to be a
reason why there exists a second CDW transition further along a?, which elucidates the observed double CDW
transitions in ErTe3.
Author(s)
성승호김희정김규민병일권용성한상욱박병규R. Stania서연지강정수
Issued Date
2021
Type
Article
Keyword
Double charge density wave transitionAngle-resolved photoemissionErTe3
DOI
10.1103/PhysRevB.104.195153
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9539
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1103_PhysRevB_104_195153&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Angle-resolved%20photoemission%20spectroscopy%20study%20of%20a%20system%20with%20a%20double%20charge%20density%20wave%20transition:%20ErTe3&offset=0&pcAvailability=true
Publisher
PHYSICAL REVIEW B
Location
미국
Language
영어
ISSN
2469-9950
Citation Volume
104
Citation Number
19
Citation Start Page
195153
Citation End Page
195153
Appears in Collections:
Natural Science > Physics
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