Observation of an electron band above the Fermi level in FeTe₀.₅₅Se₀.₄₅ from in-situ surface doping

Zhang, P.; Richard, P.; Xu, N.; Xu, Y. -M.; Ma, J.; Qian, T.; Fedorov, A. V.; Denlinger, J. D.; Gu, G. D.; Ding, H.

doi:10.1063/1.4900870

Title: Observation of an electron band above the Fermi level in FeTe₀.₅₅Se₀.₄₅ from in-situ surface doping

Journal Article · Mon Oct 27 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4900870· OSTI ID:1182486

Zhang, P. ^[1]; Richard, P. ^[2]; Xu, N. ^[3]; Xu, Y. -M. ^[4]; Ma, J. ^[5]; Qian, T. ^[5]; Fedorov, A. V. ^[6]; Denlinger, J. D. ^[6]; Gu, G. D. ^[7]; Ding, H. ^[2]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS). Collaborative Innovation Center of Quantum Matter, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS). Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS).
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Sciences Depts.

We used in-situ potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe₀.₅₅Se₀.₄₅. The systematic study of the bands near the Fermi level confirms that electrons are doped into the system, allowing us to tune the Fermi level of this material and to access otherwise unoccupied electronic states. In particular, we observe an electron band located above the Fermi level before doping that shares similarities with a small three-dimensional pocket observed in the cousin, heavily-electron-doped KFe₂₋_xSe₂ compound.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; 11004232; 11034011/A0402; 11234014; 11274362; 2010CB923000; 2011CBA001000; 2011CBA00102; 2012CB821403; 2013CB921703

OSTI ID:: 1182486

Alternate ID(s):: OSTI ID: 1224259

Report Number(s):: BNL-107339-2015-JA; APPLAB; R&D Project: PO010; KC0201060

Journal Information:: Applied Physics Letters, Vol. 105, Issue 17; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Cited By (3)

Alkali-metal induced band structure deformation investigated by angle-resolved photoemission spectroscopy and first-principles calculations Ito, S.; Feng, B.; Arita, M. Physical Review B, Vol. 97, Issue 15 https://doi.org/10.1103/physrevb.97.155423	journal	April 2018
Observation of topological superconductivity on the surface of an iron-based superconductor Zhang, Peng; Yaji, Koichiro; Hashimoto, Takahiro Science, Vol. 360, Issue 6385 https://doi.org/10.1126/science.aan4596	journal	March 2018
Observation of topological superconductivity on the surface of an iron-based superconductor Zhang, Peng; Yaji, Koichiro; Hashimoto, Takahiro arXiv https://doi.org/10.48550/arxiv.1706.05163	text	January 2017

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