Large surface conductance and superconductivity in topological insulator microstructures
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 andmore »
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1572356
- Alternate Identifier(s):
- OSTI ID: 1571675
- Report Number(s):
- BNL-212271-2019-JAAM
Journal ID: ISSN 0003-6951; TRN: US2001102
- Grant/Contract Number:
- SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 115; Journal Issue: 17; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Li, Yangmu, Wu, Jie, Camino, Fernando, Gu, G. D., Božović, Ivan, and Tranquada, John M. Large surface conductance and superconductivity in topological insulator microstructures. United States: N. p., 2019.
Web. doi:10.1063/1.5122789.
Li, Yangmu, Wu, Jie, Camino, Fernando, Gu, G. D., Božović, Ivan, & Tranquada, John M. Large surface conductance and superconductivity in topological insulator microstructures. United States. https://doi.org/10.1063/1.5122789
Li, Yangmu, Wu, Jie, Camino, Fernando, Gu, G. D., Božović, Ivan, and Tranquada, John M. Mon .
"Large surface conductance and superconductivity in topological insulator microstructures". United States. https://doi.org/10.1063/1.5122789. https://www.osti.gov/servlets/purl/1572356.
@article{osti_1572356,
title = {Large surface conductance and superconductivity in topological insulator microstructures},
author = {Li, Yangmu and Wu, Jie and Camino, Fernando and Gu, G. D. and Božović, Ivan and Tranquada, John M.},
abstractNote = {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 = {10.1063/1.5122789},
journal = {Applied Physics Letters},
number = 17,
volume = 115,
place = {United States},
year = {Mon Oct 21 00:00:00 EDT 2019},
month = {Mon Oct 21 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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