{"id":208,"date":"2021-08-12T09:02:55","date_gmt":"2021-08-12T01:02:55","guid":{"rendered":"http:\/\/web.tdli.sjtu.edu.cn\/rzhong\/?p=208"},"modified":"2021-08-12T09:02:55","modified_gmt":"2021-08-12T01:02:55","slug":"topological-matters","status":"publish","type":"post","link":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/2021\/08\/12\/topological-matters\/","title":{"rendered":"Topological Matters"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"327\" height=\"293\" src=\"http:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-content\/uploads\/sites\/9\/2021\/07\/\u56fe\u7247-4.png\" alt=\"\" class=\"wp-image-225\" srcset=\"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-content\/uploads\/sites\/9\/2021\/07\/\u56fe\u7247-4.png 327w, https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-content\/uploads\/sites\/9\/2021\/07\/\u56fe\u7247-4-300x269.png 300w\" sizes=\"auto, (max-width: 327px) 100vw, 327px\" \/><\/figure>\n\n\n\n<p>A topological insulator is a material that behaves as an insulator in the bulk but shows exotic conducting states on its surface which are protected by the time-reversal symmetry. The interplay of magnetism and topology is a key research subject in condensed matter physics, which offers great opportunities to explore emerging new physics, such as the quantum anomalous Hall effect, axion electrodynamics, and Majorana fermions. As a new extension of the current study of topological insulators, antiferromagnetic topological insulators (AFMTI), in which the antiferromagnetic long-range order in a topological insulator spontaneously breaks time-reversal symmetry. Proposed by most cutting-edge research, MnBi2Te4, GdBiPt are two promising examples of this topological class. The as-grown MnBi2Te4 single crystal exhibits a van der Waals layered structure, which is composed of septuple Te-Bi-Te-Mn-Te-Bi-Te sequences. However, this compound is not ideal from the perspective of inorganic chemistry, since cation intermixing is ubiquitous in such structure type, and thus non-stoichiometry has been noticed in several spectroscopy experiments. Forthcoming endeavors in our group can be focused on optimizing this material by atomic substitution with rare-earth elements, which migh be able to solve the intermixing problem and meanwhile exhibt a gapped Dirac-cone-like dispersion, suggested by first-principles calculations.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A topological insulator is a material that behaves as an insulator in the bulk but shows exotic conducting states on its surface which are protected by the time-reversal symmetry. The interplay of magnetism and topology is a key research subject in condensed matter physics, which offers great opportunities to explore emerging new physics, such as the quantum anomalous Hall effect, axion electrodynamics, and Majorana fermions. As a new extension of the current study of topological insulators, antiferromagnetic topological insulators (AFMTI), in which the antiferromagnetic long-range order in a topological insulator spontaneously breaks time-reversal symmetry. Proposed by most cutting-edge research, MnBi2Te4, GdBiPt are two promising examples of this topological class. The as-grown MnBi2Te4 single crystal exhibits a van der Waals layered structure, which is composed of septuple Te-Bi-Te-Mn-Te-Bi-Te sequences. However, this compound is not ideal from the perspective of inorganic chemistry, since cation intermixing is ubiquitous in such structure type, and thus non-stoichiometry has been noticed in several spectroscopy experiments. Forthcoming endeavors in our group can be focused on optimizing this material by atomic substitution with rare-earth elements, which migh be able to solve the intermixing problem and meanwhile exhibt a gapped Dirac-cone-like dispersion, suggested by first-principles calculations.&nbsp;<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,8],"tags":[],"class_list":["post-208","post","type-post","status-publish","format-standard","hentry","category-home","category-research"],"_links":{"self":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/posts\/208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/comments?post=208"}],"version-history":[{"count":3,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/posts\/208\/revisions"}],"predecessor-version":[{"id":228,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/posts\/208\/revisions\/228"}],"wp:attachment":[{"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/media?parent=208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/categories?post=208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/web.tdli.sjtu.edu.cn\/rzhong\/wp-json\/wp\/v2\/tags?post=208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}