S. Sh. Gahramanov, Y. A. Abdullayev, H. V. Orujova, A. A. Badalov, N. A. Abdullayev
{"title":"Low Dissipative State of Bi2Se3 and Bi2Te3 Surfaces","authors":"S. Sh. Gahramanov, Y. A. Abdullayev, H. V. Orujova, A. A. Badalov, N. A. Abdullayev","doi":"10.1134/s1027451024700125","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The morphology of the (0001) surface is studied using a scanning probe microscope, and the effect of electrolytic deposition of potassium ions on the surface properties of layered Bi<sub>2</sub>Se<sub>3</sub> and Bi<sub>2</sub>Te<sub>3</sub> crystals is investigated by modulation electroreflectance spectroscopy. The process of prolonged deposition of potassium atoms onto the (0001) surface of Bi<sub>2</sub>Se<sub>3</sub> and Bi<sub>2</sub>Te<sub>3</sub> crystals after adsorption causes their intercalation into van der Waals spaces of the quintets closest to the surface. Surface metallization with potassium and broadening of van der Waals gaps in the near-surface region during intercalation due to an increase in the barrier height lead to a weakening of interlayer interaction, a decrease in the overlap of wave functions of different layers, and a weakening of dispersion. As a result of electrodeposition, potassium intercalates into the interlayer spaces. This entails modification of the surface accompanied by an increase in the concentration of charge carriers and their mobility, which implies a transition of the near-surface region to a metallic state with lower dissipation.</p>","PeriodicalId":671,"journal":{"name":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1134/s1027451024700125","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
Abstract
The morphology of the (0001) surface is studied using a scanning probe microscope, and the effect of electrolytic deposition of potassium ions on the surface properties of layered Bi2Se3 and Bi2Te3 crystals is investigated by modulation electroreflectance spectroscopy. The process of prolonged deposition of potassium atoms onto the (0001) surface of Bi2Se3 and Bi2Te3 crystals after adsorption causes their intercalation into van der Waals spaces of the quintets closest to the surface. Surface metallization with potassium and broadening of van der Waals gaps in the near-surface region during intercalation due to an increase in the barrier height lead to a weakening of interlayer interaction, a decrease in the overlap of wave functions of different layers, and a weakening of dispersion. As a result of electrodeposition, potassium intercalates into the interlayer spaces. This entails modification of the surface accompanied by an increase in the concentration of charge carriers and their mobility, which implies a transition of the near-surface region to a metallic state with lower dissipation.
期刊介绍：
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.
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