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Champagne Research Group

Atomic scale mechanical breakjunction Atomic scale mechanical breakjunction.

Nano-scale quantum electronics and mechanics

We specialize in:

  • Experimental nano-scale and mesoscopic physics,
  • Electron transport and heat transport in carbon, metallic and semiconducting systems,
  • Nano-resonators and sensors (NEMS) and
  • Quantum mechanics of strongly correlated electron systems.

Part of the widespread interest in nanometer-sized systems is motivated by their capability to combine and hybridize mechanical and electronic properties of materials at the nanoscale. The long term goals of our research are to understand at a fundamental level, and harness into applications, the interplays of structure, electronic degrees of freedom, and correlated electronic phases in nano and mesoscopic systems.

Four specific projects on which we are currently working are:

  1. Quantum electronic properties of nanosystems under strain;
  2. Heat transport in graphene (relativistic-like electrons);
  3. Nano-electro-mechanical sensors (NEMS) based on carbon nanotubes and graphene;
  4. Charge transport in defect-engineered silicon nanowires (Si-NWs).

  1. I. G. Rebollo, F. C. Rodrigues-Machado, W. Wright, G. J. Melin, A. R. Champagne, Thin-suspended 2D Heterostructures: Facile, Versatile, and Deterministic Transfer Assembly. arXiv preprint arXiv:2011.14166 (2020).

  2. A. C. McRae, G. Wei, and A. R. Champagne, Graphene Quantum Strain Transistors. Phys. Rev. Applied 11, 054019 (2019). PDFSupplemental material 1Supplemental material 2.

  3. A. C. McRae, V. Tayari, J. M. Porter, and A R. Champagne, Giant electron-hole transport asymmetry in ultra-short quantum transistors, Nature Communications 8, 15491 (2017). PDF Supplementary information

  4. V. Tayari, A. C. McRae, S. Yigen, J. O. Island, J. M. Porter, and A. R. Champagne, Tailoring 10 nm Scale Suspended Graphene Junctions and Quantum Dots, Nano Letters, 15; 114 (2015). PDF

  5. S. Yigen, and A. R. Champagne, Wiedemann-Franz Relation and Thermal-transistor Effect in Suspended Graphene, Nano Letters, 14; 289 (2014). PDF Supporting information

  6. S. Yigen, V. Tayari, J. O. Island, J. M. Porter, and A. R. Champagne, Electronic thermal conductivity measurements in intrinsic graphene, Physical Review B, 87; 241411(R) (2013) PDF Supplemental material

  7. J. O. Island, V. Tayari, A. C. McRae, and A. R. Champagne, Few-Hundred GHz Carbon Nanotube Nanoelectromechanical Systems (NEMS), Nano Letters, 12; 4564 (2012) PDF Supporting information

  8. J. O. Island, V. Tayari, S. Yigen, A. C. McRae, and A. R. Champagne, Ultra-short suspended single-wall carbon nanotube transistors, Applied Physics Letters, 99; 243106 (2011) PDF

  9. J. J. Parks, A. R. Champagne, T. A. Costi, W. W. Shum, A. N. Pasupathy, E. Neuscamman, S. Flores-Torres, P. S. Cornaglia, A. A. Aligia, C. A. Balseiro, G. K.-L. Chan, H. D. Abruña, and D. C. Ralph, Mechanical control of spin states in spin-1 molecules and the underscreened Kondo effect, Science, 328; 1370 (2010) PDF Supporting material

    Press coverage: featured in Science and Nature Nanotechnology and many other press releases.

  10. A. R. Champagne, A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer and K. W. West, Charge Imbalance and Bilayer Two-Dimensional Electron Systems at νT=1, Physical Review B78; 205310 (2008) PDF

    Press coverage: featured in Physics

  11. A. D. K. Finck, A. R. Champagne, J. P. Eisenstein, L. N. Pfeiffer and K. W. West, Area Dependence of Interlayer Tunneling in Strongly Correlated Bilayer Two-Dimensional Electron Systems at νT=1, Physical Review B, 78; 075302 (2008) PDF

    Press coverage: featured in Physics

  12. A. R. Champagne, J. P. Eisenstein, L. N. Pfeiffer and K. W. West, Evidence for a Finite-Temperature Phase Transition in a Bilayer Quantum Hall System, Physical Review Letters, 100; 096801 (2008) PDF

  13. J. J. Parks, A. R. Champagne, G. R. Hutchison, S. Flores-Torres, H. D. Abruna and D. C. Ralph, Tuning the Kondo Effect with a Mechanically Controllable Break Junction, Physical Review Letters, 99; 026601 (2007) PDF

    Press coverage: featured in Nature Nanotechnology

  14. A. R. Champagne, A. N. Pasupathy and D. C. Ralph, Mechanically Adjustable and Electrically Gated Single-Molecule Transistors, Nano Letters, 5; 305 (2005) PDF

  15. A. R. Champagne, A. J. Couture, F. Kuemmeth and D. C. Ralph, Nanometer-Scale Scanning Sensors Fabricated Using Stencil Lithography, Applied Physics Letters, 82; 1111 (2003) PDF

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