Drumhead surface states and topological nodal-line fermions in TlTaSe sub(2)
A topological nodal-line semimetal is a state of matter with one-dimensional bulk nodal lines and two-dimensional so-called drumhead surface bands. Based on first-principles calculations and an effective k[whitesquare]p model, we theoretically propose the existence of topological nodal-line fermions...
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Veröffentlicht in: | Physical review. B 2016-03, Vol.93 (12) |
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container_title | Physical review. B |
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creator | Bian, Guang Chang, Tay-Rong Zheng, Hao Velury, Saavanth Xu, Su-Yang Neupert, Titus Chiu, Ching-Kai Huang, Shin-Ming Sanchez, Daniel S Belopolski, Ilya |
description | A topological nodal-line semimetal is a state of matter with one-dimensional bulk nodal lines and two-dimensional so-called drumhead surface bands. Based on first-principles calculations and an effective k[whitesquare]p model, we theoretically propose the existence of topological nodal-line fermions in the ternary transition-metal chalcogenide TlTaSe sub(2). The noncentrosymmetric structure and strong spin-orbit coupling give rise to spinful nodal-line bulk states which are protected by a mirror reflection symmetry of this compound. This is remarkably distinguished from other proposed nodal-line semimetals such as Cu sub(3) NPb(Zn) in which the nodal line exists only in the limit of vanishing spin-orbit coupling and thus is not as robust. In addition, we show that the drumhead surface states in TlTaSe sub(2), which are associated with the topological nodal lines, exhibit an unconventional chiral spin texture and an exotic Lifshitz transition as a consequence of the linkage among multiple drumhead surface-state pockets. |
doi_str_mv | 10.1103/PhysRevB.93.121113 |
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Based on first-principles calculations and an effective k[whitesquare]p model, we theoretically propose the existence of topological nodal-line fermions in the ternary transition-metal chalcogenide TlTaSe sub(2). The noncentrosymmetric structure and strong spin-orbit coupling give rise to spinful nodal-line bulk states which are protected by a mirror reflection symmetry of this compound. This is remarkably distinguished from other proposed nodal-line semimetals such as Cu sub(3) NPb(Zn) in which the nodal line exists only in the limit of vanishing spin-orbit coupling and thus is not as robust. In addition, we show that the drumhead surface states in TlTaSe sub(2), which are associated with the topological nodal lines, exhibit an unconventional chiral spin texture and an exotic Lifshitz transition as a consequence of the linkage among multiple drumhead surface-state pockets.</description><identifier>ISSN: 2469-9950</identifier><identifier>EISSN: 2469-9969</identifier><identifier>DOI: 10.1103/PhysRevB.93.121113</identifier><language>eng</language><subject>Chalcogenides ; Condensed matter ; Fermions ; Metalloids ; Spin-orbit interactions ; Surface layer ; Texture ; Topology</subject><ispartof>Physical review. 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B</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bian, Guang</au><au>Chang, Tay-Rong</au><au>Zheng, Hao</au><au>Velury, Saavanth</au><au>Xu, Su-Yang</au><au>Neupert, Titus</au><au>Chiu, Ching-Kai</au><au>Huang, Shin-Ming</au><au>Sanchez, Daniel S</au><au>Belopolski, Ilya</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Drumhead surface states and topological nodal-line fermions in TlTaSe sub(2)</atitle><jtitle>Physical review. B</jtitle><date>2016-03-15</date><risdate>2016</risdate><volume>93</volume><issue>12</issue><issn>2469-9950</issn><eissn>2469-9969</eissn><abstract>A topological nodal-line semimetal is a state of matter with one-dimensional bulk nodal lines and two-dimensional so-called drumhead surface bands. Based on first-principles calculations and an effective k[whitesquare]p model, we theoretically propose the existence of topological nodal-line fermions in the ternary transition-metal chalcogenide TlTaSe sub(2). The noncentrosymmetric structure and strong spin-orbit coupling give rise to spinful nodal-line bulk states which are protected by a mirror reflection symmetry of this compound. This is remarkably distinguished from other proposed nodal-line semimetals such as Cu sub(3) NPb(Zn) in which the nodal line exists only in the limit of vanishing spin-orbit coupling and thus is not as robust. In addition, we show that the drumhead surface states in TlTaSe sub(2), which are associated with the topological nodal lines, exhibit an unconventional chiral spin texture and an exotic Lifshitz transition as a consequence of the linkage among multiple drumhead surface-state pockets.</abstract><doi>10.1103/PhysRevB.93.121113</doi></addata></record> |
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subjects | Chalcogenides Condensed matter Fermions Metalloids Spin-orbit interactions Surface layer Texture Topology |
title | Drumhead surface states and topological nodal-line fermions in TlTaSe sub(2) |
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