Publication: Origin of the temperature dependence of the energy gap in Cr-doped Bi2Se3
dc.contributor.author | Hines, William | |
dc.contributor.author | Alraddadi, Shoroog | |
dc.contributor.author | Budnick, Joseph I. | |
dc.contributor.author | Sinkovic, Boris | |
dc.contributor.buuauthor | Yılmaz, Turgut | |
dc.contributor.department | Fen Edebiyat Fakültesi | |
dc.contributor.department | Fizik Bölümü | |
dc.contributor.orcid | 0000-0002-6735-8088 | |
dc.contributor.orcid | 0000-0001-7571-0937 | |
dc.contributor.researcherid | IQS-3983-2023 | |
dc.contributor.researcherid | S-1198-2017 | |
dc.contributor.scopusid | 57193498321 | |
dc.date.accessioned | 2023-09-25T11:37:32Z | |
dc.date.available | 2023-09-25T11:37:32Z | |
dc.date.issued | 2018-04-07 | |
dc.description.abstract | Recent progress in impurity-doped topological insulators has shown that the gap at the Dirac point shrinks with reducing temperature. This is an obstacle for experimental realization of the quantum anomalous Hall effect at higher temperature due to the requirement of a larger energy gap. In order to solve this puzzle, we study the gap at the Dirac point by performing temperature-dependent photoemission spectroscopy and X-ray diffraction experiments in Cr-doped Bi2Se3. Our valence band photoemission study revealed that the gap alters with temperature due to residual gas condensation on the sample surface with cooling. Residual gas on the sample surface creates an electron doping effect that modifies the chemical potential of the system resulting in the change of the gap size with variable temperature. Furthermore, such electron doping can weaken the ferromagnetism and lead to a bulk band contribution in the transport measurements. Therefore, such effects can hinder the existence of the quantum anomalous Hall state at higher temperatures. Hence, this work can pave the way for future studies towards a high-temperature quantum anomalous Hall effect. | |
dc.description.sponsorship | University of Connecticut under the UCONN-REP - 4626510 | |
dc.description.sponsorship | Institute for Materials Science | |
dc.description.sponsorship | LDRD XWNK at Los Alamos National Laboratory | |
dc.identifier.citation | Yılmaz, T. vd. (2018). ''Origin of the temperature dependence of the energy gap in Cr-doped Bi2Se3''. Physical Chemistry Chemical Physics, 20(13), 8624-8628. | |
dc.identifier.endpage | 8628 | |
dc.identifier.issn | 1463-9076 | |
dc.identifier.issn | 1463-9084 | |
dc.identifier.issue | 13 | |
dc.identifier.pubmed | 29536071 | |
dc.identifier.scopus | 2-s2.0-85044755030 | |
dc.identifier.startpage | 8624 | |
dc.identifier.uri | https://doi.org/10.1039/c7cp08049b | |
dc.identifier.uri | https://pubs.rsc.org/en/content/articlelanding/2018/CP/C7CP08049B | |
dc.identifier.uri | http://hdl.handle.net/11452/34025 | |
dc.identifier.volume | 20 | |
dc.identifier.wos | 000428779700024 | |
dc.indexed.wos | SCIE | |
dc.language.iso | en | |
dc.publisher | Royal Soc Chemistry | |
dc.relation.collaboration | Yurt dışı | |
dc.relation.journal | Physical Chemistry Chemical Physics | |
dc.relation.publicationcategory | Makale - Uluslararası Hakemli Dergi | |
dc.rights | info:eu-repo/semantics/openAccess | |
dc.subject | Chemistry | |
dc.subject | Physics | |
dc.subject | Magnetic topological insulator | |
dc.subject | Phase-transition | |
dc.subject | Surface | |
dc.subject | Photoemission | |
dc.subject | Film | |
dc.subject | Xps | |
dc.subject.scopus | Topological Insulators; Bismuth Selenide; Topology | |
dc.subject.wos | Chemistry, physical | |
dc.subject.wos | Physics, atomic, molecular & chemical | |
dc.title | Origin of the temperature dependence of the energy gap in Cr-doped Bi2Se3 | |
dc.type | Article | |
dc.wos.quartile | Q2 (Chemistry, physical) | |
dc.wos.quartile | Q1 (Physics, atomic, molecular & chemical) | |
dspace.entity.type | Publication | |
local.contributor.department | Fen Edebiyat Fakültesi/Fizik Bölümü | |
local.indexed.at | Scopus | |
local.indexed.at | WOS |