Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator
Abstract The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow tem...
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| Veröffentlicht in: | Advanced materials (Weinheim) 2017-11, Vol.30 (1) |
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| creator | Ou, Yunbo Liu, Chang Jiang, Gaoyuan Feng, Yang Zhao, Dongyang Wu, Weixiong Wang, Xiao‐Xiao Li, Wei Song, Canli Wang, Li‐Li Wang, Wenbo Wu, Weida Wang, Yayu He, Ke Ma, Xu‐Cun Xue, Qi‐Kun |
| description | Abstract
The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow temperatures needed to reach full quantization—usually below 100 mK in either Cr‐ or V‐doped (Bi,Sb)
2
Te
3
of the two experimentally confirmed QAH materials. Here it is shown that by codoping Cr and V magnetic elements in (Bi,Sb)
2
Te
3
TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK, and zero‐field Hall resistance of 0.97
h
/
e
2
is observed at 1.5 K. A systematic transport study of the codoped (Bi,Sb)
2
Te
3
films with varied Cr/V ratios reveals that magnetic codoping improves the homogeneity of ferromagnetism and modulates the surface band structure. This work demonstrates magnetic codoping to be an effective strategy for achieving high‐temperature QAH effect in TIs. |
| format | Article |
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The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow temperatures needed to reach full quantization—usually below 100 mK in either Cr‐ or V‐doped (Bi,Sb)
2
Te
3
of the two experimentally confirmed QAH materials. Here it is shown that by codoping Cr and V magnetic elements in (Bi,Sb)
2
Te
3
TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK, and zero‐field Hall resistance of 0.97
h
/
e
2
is observed at 1.5 K. A systematic transport study of the codoped (Bi,Sb)
2
Te
3
films with varied Cr/V ratios reveals that magnetic codoping improves the homogeneity of ferromagnetism and modulates the surface band structure. This work demonstrates magnetic codoping to be an effective strategy for achieving high‐temperature QAH effect in TIs.</description><identifier>ISSN: 0935-9648</identifier><identifier>EISSN: 1521-4095</identifier><language>eng</language><publisher>Germany: Wiley Blackwell (John Wiley & Sons)</publisher><ispartof>Advanced materials (Weinheim), 2017-11, Vol.30 (1)</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000000293508756</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/1408265$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Ou, Yunbo</creatorcontrib><creatorcontrib>Liu, Chang</creatorcontrib><creatorcontrib>Jiang, Gaoyuan</creatorcontrib><creatorcontrib>Feng, Yang</creatorcontrib><creatorcontrib>Zhao, Dongyang</creatorcontrib><creatorcontrib>Wu, Weixiong</creatorcontrib><creatorcontrib>Wang, Xiao‐Xiao</creatorcontrib><creatorcontrib>Li, Wei</creatorcontrib><creatorcontrib>Song, Canli</creatorcontrib><creatorcontrib>Wang, Li‐Li</creatorcontrib><creatorcontrib>Wang, Wenbo</creatorcontrib><creatorcontrib>Wu, Weida</creatorcontrib><creatorcontrib>Wang, Yayu</creatorcontrib><creatorcontrib>He, Ke</creatorcontrib><creatorcontrib>Ma, Xu‐Cun</creatorcontrib><creatorcontrib>Xue, Qi‐Kun</creatorcontrib><title>Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator</title><title>Advanced materials (Weinheim)</title><description>Abstract
The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow temperatures needed to reach full quantization—usually below 100 mK in either Cr‐ or V‐doped (Bi,Sb)
2
Te
3
of the two experimentally confirmed QAH materials. Here it is shown that by codoping Cr and V magnetic elements in (Bi,Sb)
2
Te
3
TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK, and zero‐field Hall resistance of 0.97
h
/
e
2
is observed at 1.5 K. A systematic transport study of the codoped (Bi,Sb)
2
Te
3
films with varied Cr/V ratios reveals that magnetic codoping improves the homogeneity of ferromagnetism and modulates the surface band structure. This work demonstrates magnetic codoping to be an effective strategy for achieving high‐temperature QAH effect in TIs.</description><issn>0935-9648</issn><issn>1521-4095</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqNjLsKwjAUQIMoWB__cHEvpI-UdhSp6OAguDmUa0zbSLxXTDr49yr4AU5nOeeMRJSoNIlzWamxiGSVqbgq8nIqZt7fpJRVIYtInGvqkbSlDkJv4DggheEOa-I7Oh487NA5qNvW6ACXFxywIxOshg1f-fHNLAHCiR_suLMaHezJDw4DPxdi0qLzZvnjXKy29Wmzi9kH23htg9G9ZqLPu0lyWaaFyv6S3sqLQ9Q</recordid><startdate>20171110</startdate><enddate>20171110</enddate><creator>Ou, Yunbo</creator><creator>Liu, Chang</creator><creator>Jiang, Gaoyuan</creator><creator>Feng, Yang</creator><creator>Zhao, Dongyang</creator><creator>Wu, Weixiong</creator><creator>Wang, Xiao‐Xiao</creator><creator>Li, Wei</creator><creator>Song, Canli</creator><creator>Wang, Li‐Li</creator><creator>Wang, Wenbo</creator><creator>Wu, Weida</creator><creator>Wang, Yayu</creator><creator>He, Ke</creator><creator>Ma, Xu‐Cun</creator><creator>Xue, Qi‐Kun</creator><general>Wiley Blackwell (John Wiley & Sons)</general><scope>OTOTI</scope><orcidid>https://orcid.org/0000000293508756</orcidid></search><sort><creationdate>20171110</creationdate><title>Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator</title><author>Ou, Yunbo ; Liu, Chang ; Jiang, Gaoyuan ; Feng, Yang ; Zhao, Dongyang ; Wu, Weixiong ; Wang, Xiao‐Xiao ; Li, Wei ; Song, Canli ; Wang, Li‐Li ; Wang, Wenbo ; Wu, Weida ; Wang, Yayu ; He, Ke ; Ma, Xu‐Cun ; Xue, Qi‐Kun</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-osti_scitechconnect_14082653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ou, Yunbo</creatorcontrib><creatorcontrib>Liu, Chang</creatorcontrib><creatorcontrib>Jiang, Gaoyuan</creatorcontrib><creatorcontrib>Feng, Yang</creatorcontrib><creatorcontrib>Zhao, Dongyang</creatorcontrib><creatorcontrib>Wu, Weixiong</creatorcontrib><creatorcontrib>Wang, Xiao‐Xiao</creatorcontrib><creatorcontrib>Li, Wei</creatorcontrib><creatorcontrib>Song, Canli</creatorcontrib><creatorcontrib>Wang, Li‐Li</creatorcontrib><creatorcontrib>Wang, Wenbo</creatorcontrib><creatorcontrib>Wu, Weida</creatorcontrib><creatorcontrib>Wang, Yayu</creatorcontrib><creatorcontrib>He, Ke</creatorcontrib><creatorcontrib>Ma, Xu‐Cun</creatorcontrib><creatorcontrib>Xue, Qi‐Kun</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Advanced materials (Weinheim)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ou, Yunbo</au><au>Liu, Chang</au><au>Jiang, Gaoyuan</au><au>Feng, Yang</au><au>Zhao, Dongyang</au><au>Wu, Weixiong</au><au>Wang, Xiao‐Xiao</au><au>Li, Wei</au><au>Song, Canli</au><au>Wang, Li‐Li</au><au>Wang, Wenbo</au><au>Wu, Weida</au><au>Wang, Yayu</au><au>He, Ke</au><au>Ma, Xu‐Cun</au><au>Xue, Qi‐Kun</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator</atitle><jtitle>Advanced materials (Weinheim)</jtitle><date>2017-11-10</date><risdate>2017</risdate><volume>30</volume><issue>1</issue><issn>0935-9648</issn><eissn>1521-4095</eissn><abstract>Abstract
The quantum anomalous Hall (QAH) effect, which has been realized in magnetic topological insulators (TIs), is the key to applications of dissipationless quantum Hall edge states in electronic devices. However, investigations and utilizations of the QAH effect are limited by the ultralow temperatures needed to reach full quantization—usually below 100 mK in either Cr‐ or V‐doped (Bi,Sb)
2
Te
3
of the two experimentally confirmed QAH materials. Here it is shown that by codoping Cr and V magnetic elements in (Bi,Sb)
2
Te
3
TI, the temperature of the QAH effect can be significantly increased such that full quantization is achieved at 300 mK, and zero‐field Hall resistance of 0.97
h
/
e
2
is observed at 1.5 K. A systematic transport study of the codoped (Bi,Sb)
2
Te
3
films with varied Cr/V ratios reveals that magnetic codoping improves the homogeneity of ferromagnetism and modulates the surface band structure. This work demonstrates magnetic codoping to be an effective strategy for achieving high‐temperature QAH effect in TIs.</abstract><cop>Germany</cop><pub>Wiley Blackwell (John Wiley & Sons)</pub><orcidid>https://orcid.org/0000000293508756</orcidid></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete |
| title | Enhancing the Quantum Anomalous Hall Effect by Magnetic Codoping in a Topological Insulator |
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