Large surface conductance and superconductivity in topological insulator microstructures
Controllable geometric manipulation via micromachining techniques provides a promising tool for enhancing useful topological electrical responses relevant to future applications such as quantum information science [P. J. W. Moll, “Focused ion beam microstructuring of quantum matter,” Annu. Rev. Cond...
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creator | Li, Yangmu Wu, Jie Camino, Fernando Gu, G. D. Božović, Ivan Tranquada, John M. |
description | Controllable geometric manipulation via micromachining techniques provides a promising tool for enhancing useful topological electrical responses relevant to future applications such as quantum information science [P. J. W. Moll, “Focused ion beam microstructuring of quantum matter,” Annu. Rev. Condens. Matter Phys. 9, 147 (2018); Jang et al., “Observation of half-height magnetization steps in Sr2RuO4,” Science 331, 186 (2011); Moll et al., “Transport evidence for Fermi-arc-mediated chirality transfer in the Dirac semimetal Cd3As2,” Nature 535, 266 (2016); Moll et al., “Evidence for hydrodynamic electron flow in PdCoO2,” Science 351, 1061 (2016)]. Here, we present microdevices fabricated with a focused ion beam from an indium-doped topological insulator Pb1−xSnxTe. With the device thickness on the order of 1 μm and an extremely large bulk resistivity, we achieve an unprecedented enhancement of the surface contribution to about 30% of the total conductance near room temperature. The surface contribution increases as the temperature is reduced, becoming dominant below approximately 180 K, compared to 30 K in millimeter-thickness crystals. In addition to the enhanced surface contribution to normal-state transport, we observe the emergence of surface superconductivity below 6 K. Measurements of magnetoresistivity at high magnetic fields reveal a weak antilocalization behavior in the normal-state magnetoconductance at low temperatures and a variation in the power-law dependence of resistivity on temperature with the field. These results demonstrate that interesting electronic responses relevant to practical applications can be achieved by suitable engineering of single crystals. |
doi_str_mv | 10.1063/1.5122789 |
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D. ; Božović, Ivan ; Tranquada, John M.</creator><creatorcontrib>Li, Yangmu ; Wu, Jie ; Camino, Fernando ; Gu, G. D. ; Božović, Ivan ; Tranquada, John M.</creatorcontrib><description>Controllable geometric manipulation via micromachining techniques provides a promising tool for enhancing useful topological electrical responses relevant to future applications such as quantum information science [P. J. W. Moll, “Focused ion beam microstructuring of quantum matter,” Annu. Rev. Condens. Matter Phys. 9, 147 (2018); Jang et al., “Observation of half-height magnetization steps in Sr2RuO4,” Science 331, 186 (2011); Moll et al., “Transport evidence for Fermi-arc-mediated chirality transfer in the Dirac semimetal Cd3As2,” Nature 535, 266 (2016); Moll et al., “Evidence for hydrodynamic electron flow in PdCoO2,” Science 351, 1061 (2016)]. Here, we present microdevices fabricated with a focused ion beam from an indium-doped topological insulator Pb1−xSnxTe. With the device thickness on the order of 1 μm and an extremely large bulk resistivity, we achieve an unprecedented enhancement of the surface contribution to about 30% of the total conductance near room temperature. The surface contribution increases as the temperature is reduced, becoming dominant below approximately 180 K, compared to 30 K in millimeter-thickness crystals. In addition to the enhanced surface contribution to normal-state transport, we observe the emergence of surface superconductivity below 6 K. Measurements of magnetoresistivity at high magnetic fields reveal a weak antilocalization behavior in the normal-state magnetoconductance at low temperatures and a variation in the power-law dependence of resistivity on temperature with the field. These results demonstrate that interesting electronic responses relevant to practical applications can be achieved by suitable engineering of single crystals.</description><identifier>ISSN: 0003-6951</identifier><identifier>EISSN: 1077-3118</identifier><identifier>DOI: 10.1063/1.5122789</identifier><identifier>CODEN: APPLAB</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Applied physics ; Chirality ; Electrical resistivity ; Ion beams ; Magnetoresistivity ; Micromachining ; Quantum phenomena ; Resistance ; Single crystals ; Strontium ruthenium oxide ; Superconductivity ; Temperature dependence ; Thickness ; Topological insulators ; Transport</subject><ispartof>Applied physics letters, 2019-10, Vol.115 (17)</ispartof><rights>Author(s)</rights><rights>2019 Author(s). 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D.</creatorcontrib><creatorcontrib>Božović, Ivan</creatorcontrib><creatorcontrib>Tranquada, John M.</creatorcontrib><title>Large surface conductance and superconductivity in topological insulator microstructures</title><title>Applied physics letters</title><description>Controllable geometric manipulation via micromachining techniques provides a promising tool for enhancing useful topological electrical responses relevant to future applications such as quantum information science [P. J. W. Moll, “Focused ion beam microstructuring of quantum matter,” Annu. Rev. Condens. Matter Phys. 9, 147 (2018); Jang et al., “Observation of half-height magnetization steps in Sr2RuO4,” Science 331, 186 (2011); Moll et al., “Transport evidence for Fermi-arc-mediated chirality transfer in the Dirac semimetal Cd3As2,” Nature 535, 266 (2016); Moll et al., “Evidence for hydrodynamic electron flow in PdCoO2,” Science 351, 1061 (2016)]. Here, we present microdevices fabricated with a focused ion beam from an indium-doped topological insulator Pb1−xSnxTe. With the device thickness on the order of 1 μm and an extremely large bulk resistivity, we achieve an unprecedented enhancement of the surface contribution to about 30% of the total conductance near room temperature. The surface contribution increases as the temperature is reduced, becoming dominant below approximately 180 K, compared to 30 K in millimeter-thickness crystals. In addition to the enhanced surface contribution to normal-state transport, we observe the emergence of surface superconductivity below 6 K. Measurements of magnetoresistivity at high magnetic fields reveal a weak antilocalization behavior in the normal-state magnetoconductance at low temperatures and a variation in the power-law dependence of resistivity on temperature with the field. These results demonstrate that interesting electronic responses relevant to practical applications can be achieved by suitable engineering of single crystals.</description><subject>Applied physics</subject><subject>Chirality</subject><subject>Electrical resistivity</subject><subject>Ion beams</subject><subject>Magnetoresistivity</subject><subject>Micromachining</subject><subject>Quantum phenomena</subject><subject>Resistance</subject><subject>Single crystals</subject><subject>Strontium ruthenium oxide</subject><subject>Superconductivity</subject><subject>Temperature dependence</subject><subject>Thickness</subject><subject>Topological insulators</subject><subject>Transport</subject><issn>0003-6951</issn><issn>1077-3118</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqd0EtLAzEQAOAgCtbqwX-w6Elhax6bTXIU8QUFLwreQsyjpmw3a5It9N-bsgXvniYzfMxMBoBLBBcItuQOLSjCmHFxBGYIMlYThPgxmEEISd0Kik7BWUrrklJMyAx8LlVc2SqN0SltKx16M-qs-vJWvSn1wcZD0W993lW-r3IYQhdWXquupGnsVA6x2ngdQ8qxyDHadA5OnOqSvTjEOfh4enx_eKmXb8-vD_fLWhMucs0E5oZy6DRhDddYk8YooTBqtGlJ-8UtN6LVAjunBTWQtdQI5QhXDbEUQTIHV1PfMtvLpH22-rts3FudJaIMtYwWdD2hIYaf0aYs12GMfdlLYgI5QQwjUdTNpPYfSdE6OUS_UXEnEZT760okD9ct9nay-4kq-9D_D29D_INyMI78AgXXiVM</recordid><startdate>20191021</startdate><enddate>20191021</enddate><creator>Li, Yangmu</creator><creator>Wu, Jie</creator><creator>Camino, Fernando</creator><creator>Gu, G. D.</creator><creator>Božović, Ivan</creator><creator>Tranquada, John M.</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0003-0886-2919</orcidid><orcidid>https://orcid.org/0000-0003-4984-8857</orcidid><orcidid>https://orcid.org/0000000308862919</orcidid><orcidid>https://orcid.org/0000000349848857</orcidid></search><sort><creationdate>20191021</creationdate><title>Large surface conductance and superconductivity in topological insulator microstructures</title><author>Li, Yangmu ; Wu, Jie ; Camino, Fernando ; Gu, G. D. ; Božović, Ivan ; Tranquada, John M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c389t-7928d580fc3748c2c34da9a214cd636b8e8d96c92ffc95d0765d9af38a43e5103</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Applied physics</topic><topic>Chirality</topic><topic>Electrical resistivity</topic><topic>Ion beams</topic><topic>Magnetoresistivity</topic><topic>Micromachining</topic><topic>Quantum phenomena</topic><topic>Resistance</topic><topic>Single crystals</topic><topic>Strontium ruthenium oxide</topic><topic>Superconductivity</topic><topic>Temperature dependence</topic><topic>Thickness</topic><topic>Topological insulators</topic><topic>Transport</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Li, Yangmu</creatorcontrib><creatorcontrib>Wu, Jie</creatorcontrib><creatorcontrib>Camino, Fernando</creatorcontrib><creatorcontrib>Gu, G. D.</creatorcontrib><creatorcontrib>Božović, Ivan</creatorcontrib><creatorcontrib>Tranquada, John M.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>Applied physics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Li, Yangmu</au><au>Wu, Jie</au><au>Camino, Fernando</au><au>Gu, G. D.</au><au>Božović, Ivan</au><au>Tranquada, John M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Large surface conductance and superconductivity in topological insulator microstructures</atitle><jtitle>Applied physics letters</jtitle><date>2019-10-21</date><risdate>2019</risdate><volume>115</volume><issue>17</issue><issn>0003-6951</issn><eissn>1077-3118</eissn><coden>APPLAB</coden><abstract>Controllable geometric manipulation via micromachining techniques provides a promising tool for enhancing useful topological electrical responses relevant to future applications such as quantum information science [P. J. W. Moll, “Focused ion beam microstructuring of quantum matter,” Annu. Rev. Condens. Matter Phys. 9, 147 (2018); Jang et al., “Observation of half-height magnetization steps in Sr2RuO4,” Science 331, 186 (2011); Moll et al., “Transport evidence for Fermi-arc-mediated chirality transfer in the Dirac semimetal Cd3As2,” Nature 535, 266 (2016); Moll et al., “Evidence for hydrodynamic electron flow in PdCoO2,” Science 351, 1061 (2016)]. Here, we present microdevices fabricated with a focused ion beam from an indium-doped topological insulator Pb1−xSnxTe. With the device thickness on the order of 1 μm and an extremely large bulk resistivity, we achieve an unprecedented enhancement of the surface contribution to about 30% of the total conductance near room temperature. The surface contribution increases as the temperature is reduced, becoming dominant below approximately 180 K, compared to 30 K in millimeter-thickness crystals. In addition to the enhanced surface contribution to normal-state transport, we observe the emergence of surface superconductivity below 6 K. Measurements of magnetoresistivity at high magnetic fields reveal a weak antilocalization behavior in the normal-state magnetoconductance at low temperatures and a variation in the power-law dependence of resistivity on temperature with the field. These results demonstrate that interesting electronic responses relevant to practical applications can be achieved by suitable engineering of single crystals.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5122789</doi><tpages>4</tpages><orcidid>https://orcid.org/0000-0003-0886-2919</orcidid><orcidid>https://orcid.org/0000-0003-4984-8857</orcidid><orcidid>https://orcid.org/0000000308862919</orcidid><orcidid>https://orcid.org/0000000349848857</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Applied physics Chirality Electrical resistivity Ion beams Magnetoresistivity Micromachining Quantum phenomena Resistance Single crystals Strontium ruthenium oxide Superconductivity Temperature dependence Thickness Topological insulators Transport |
title | Large surface conductance and superconductivity in topological insulator microstructures |
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