Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips
We use dynamic scanning capacitance microscopy to image compressible and incompressible strips at the edge of a Hall bar in a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime. This method gives access to the complex local conductance, G _ts , between a sharp metallic tip s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2012-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/14/8/083015 |
| _version_ | 1797751606922444800 |
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| author | M E Suddards A Baumgartner M Henini C J Mellor |
| author_facet | M E Suddards A Baumgartner M Henini C J Mellor |
| author_sort | M E Suddards |
| collection | DOAJ |
| description | We use dynamic scanning capacitance microscopy to image compressible and incompressible strips at the edge of a Hall bar in a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime. This method gives access to the complex local conductance, G _ts , between a sharp metallic tip scanned across the sample surface and ground, comprising the complex sample conductance. Near integer filling factors we observe a bright stripe along the sample edge in the imaginary part of G _ts . The simultaneously recorded real part exhibits a sharp peak at the boundary between the sample interior and the stripe observed in the imaginary part. The features are periodic in the inverse magnetic field and consistent with compressible and incompressible strips forming at the sample edge. For currents larger than the critical current of the QHE break-down the stripes vanish sharply and a homogeneous signal is recovered, similar to zero magnetic field. Our experiments directly illustrate the formation and a variety of properties of the conceptually important QHE edge states at the physical edge of a 2DEG. |
| first_indexed | 2024-03-12T16:52:00Z |
| format | Article |
| id | doaj.art-c9e8c4d4cf2d4ffa8da0268a969d6e79 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:52:00Z |
| publishDate | 2012-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-c9e8c4d4cf2d4ffa8da0268a969d6e792023-08-08T11:10:09ZengIOP PublishingNew Journal of Physics1367-26302012-01-0114808301510.1088/1367-2630/14/8/083015Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge stripsM E Suddards0A Baumgartner1M Henini2C J Mellor3School of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, UKSchool of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, UKSchool of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, UK; Nottingham Nanotechnology and Nanoscience Centre, University of Nottingham , Nottingham NG7 2RD, UKSchool of Physics and Astronomy, University of Nottingham , Nottingham NG7 2RD, UKWe use dynamic scanning capacitance microscopy to image compressible and incompressible strips at the edge of a Hall bar in a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime. This method gives access to the complex local conductance, G _ts , between a sharp metallic tip scanned across the sample surface and ground, comprising the complex sample conductance. Near integer filling factors we observe a bright stripe along the sample edge in the imaginary part of G _ts . The simultaneously recorded real part exhibits a sharp peak at the boundary between the sample interior and the stripe observed in the imaginary part. The features are periodic in the inverse magnetic field and consistent with compressible and incompressible strips forming at the sample edge. For currents larger than the critical current of the QHE break-down the stripes vanish sharply and a homogeneous signal is recovered, similar to zero magnetic field. Our experiments directly illustrate the formation and a variety of properties of the conceptually important QHE edge states at the physical edge of a 2DEG.https://doi.org/10.1088/1367-2630/14/8/083015 |
| spellingShingle | M E Suddards A Baumgartner M Henini C J Mellor Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips New Journal of Physics |
| title | Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips |
| title_full | Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips |
| title_fullStr | Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips |
| title_full_unstemmed | Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips |
| title_short | Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips |
| title_sort | scanning capacitance imaging of compressible and incompressible quantum hall effect edge strips |
| url | https://doi.org/10.1088/1367-2630/14/8/083015 |
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