| EPSRC Reference: |
EP/P510221/1 |
| Title: |
Industrial feasibility test of a graphene-enabled turnkey quantum resistance system |
| Principal Investigator: |
Falko, Professor V |
| Other Investigators: |
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| Department: |
Physics and Astronomy |
| Organisation: |
University of Manchester, The |
| Scheme: |
Technology Programme |
| Starts: |
01 June 2016 |
Ends: |
31 May 2017 |
Value (£): |
73,209
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| EPSRC Research Topic Classifications: |
| Instrumentation Eng. & Dev. |
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| EPSRC Industrial Sector Classifications: |
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Summary on Grant Application Form |
Benchmark: The minimum requirement for primary resistance metrology is to measure the quantum Hall resistance to better than 1 part per billion (or 1 nanoOhm/Ohm). When using traditional GaAs/AlGaAs heterostructues or Si MOSFETs this requires a measurement current of at least 25 microamps through the device without breakdown of the quantum Hall effect. To achieve this the temperature must be below 1 kelvin and the magnetic field around 10 tesla or higher to achieve robust Landau quantisation.
Benefit of graphene: Graphene improves on this in several ways: firstly the Landau quantisation is intrinsically much stronger (factor of 5 at 10 T). Secondly, because of the specific phonon spectrum and electron-phonon coupling strength the relaxation of hot carriers in graphene is 10 times faster than in GaAs, resulting in a much larger breakdown current. The combination of these two unique graphene properties mean that a superior quantum Hall resistance can be constructed. However, so far these effects have been demonstrated in academic research and the advanced laboratory conditions at the National Physical Laboratory.
Targetted improvement: The challenge of this project to take these results forwards and make these measurements routine in a simple turn-key cryogen-free magneto-transport system. Specifically the project needs to address the noise levels produced in cryogen-free pulse-tube coolers, the control of the charge carrier density and homogeneity at very low carrier densities, and ability to perform ppb-level measurements outside metrology laboratory.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.man.ac.uk |