Spin polarised quantum conductance in 1D channels
We report the experimental observation of a spin-polarised conductance plateau at e ^2 / h in a clean one-dimensional (1D) quantum wire defined by back-gated, split gate devices on a GaAs/AlGaAs heterostructure in the absence of a magnetic field. The 1D devices were fabricated using standard lithogr...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | Applied Physics Express |
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| Online Access: | https://doi.org/10.35848/1882-0786/adac27 |
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| author | Henry Montagu Ian Farrer David Ritchie Sanjeev Kumar |
| author_facet | Henry Montagu Ian Farrer David Ritchie Sanjeev Kumar |
| author_sort | Henry Montagu |
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| description | We report the experimental observation of a spin-polarised conductance plateau at e ^2 / h in a clean one-dimensional (1D) quantum wire defined by back-gated, split gate devices on a GaAs/AlGaAs heterostructure in the absence of a magnetic field. The 1D devices were fabricated using standard lithography techniques consisting of split gates, and a custom-designed back gate allows for the modulation of carrier density within the 1D channel. The differential conductance shows regular quantised plateaus in units of 2 e ^2 / h as a function of back gate voltage, including the observation of the 0.7(2 e ^2 / h ) conductance anomaly. The 0.7 anomaly, on reducing the charge carrier concentration, gradually converts into a 0.5(2 e ^2 / h ) structure, indicating the lifting of spin degeneracy in the absence of a magnetic field. Our results suggest the potential of low-density 1D devices for applications in spintronics and quantum electronics. |
| format | Article |
| id | doaj-art-2b0651dc89d64793b2a28bec396fc8b7 |
| institution | Kabale University |
| issn | 1882-0786 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Applied Physics Express |
| spelling | doaj-art-2b0651dc89d64793b2a28bec396fc8b72025-01-31T05:08:36ZengIOP PublishingApplied Physics Express1882-07862025-01-0118101500210.35848/1882-0786/adac27Spin polarised quantum conductance in 1D channelsHenry Montagu0Ian Farrer1David Ritchie2Sanjeev Kumar3https://orcid.org/0000-0002-5195-0175Department of Electronic and Electrical Engineering, University College London , Torrington Place, London WC1E 7JE, United KingdomSchool of Electrical & Electronic Engineering, University of Sheffield , Mappin Street, Sheffield, S1 3JD, United KingdomCavendish Laboratory, University of Cambridge , J. J. Thomson Avenue,Cambridge CB3 0HE, United KingdomDepartment of Electronic and Electrical Engineering, University College London , Torrington Place, London WC1E 7JE, United KingdomWe report the experimental observation of a spin-polarised conductance plateau at e ^2 / h in a clean one-dimensional (1D) quantum wire defined by back-gated, split gate devices on a GaAs/AlGaAs heterostructure in the absence of a magnetic field. The 1D devices were fabricated using standard lithography techniques consisting of split gates, and a custom-designed back gate allows for the modulation of carrier density within the 1D channel. The differential conductance shows regular quantised plateaus in units of 2 e ^2 / h as a function of back gate voltage, including the observation of the 0.7(2 e ^2 / h ) conductance anomaly. The 0.7 anomaly, on reducing the charge carrier concentration, gradually converts into a 0.5(2 e ^2 / h ) structure, indicating the lifting of spin degeneracy in the absence of a magnetic field. Our results suggest the potential of low-density 1D devices for applications in spintronics and quantum electronics.https://doi.org/10.35848/1882-0786/adac27quantum wiremany body effectsexchange correlationsplit gatesspintronics |
| spellingShingle | Henry Montagu Ian Farrer David Ritchie Sanjeev Kumar Spin polarised quantum conductance in 1D channels Applied Physics Express quantum wire many body effects exchange correlation split gates spintronics |
| title | Spin polarised quantum conductance in 1D channels |
| title_full | Spin polarised quantum conductance in 1D channels |
| title_fullStr | Spin polarised quantum conductance in 1D channels |
| title_full_unstemmed | Spin polarised quantum conductance in 1D channels |
| title_short | Spin polarised quantum conductance in 1D channels |
| title_sort | spin polarised quantum conductance in 1d channels |
| topic | quantum wire many body effects exchange correlation split gates spintronics |
| url | https://doi.org/10.35848/1882-0786/adac27 |
| work_keys_str_mv | AT henrymontagu spinpolarisedquantumconductancein1dchannels AT ianfarrer spinpolarisedquantumconductancein1dchannels AT davidritchie spinpolarisedquantumconductancein1dchannels AT sanjeevkumar spinpolarisedquantumconductancein1dchannels |