Concordia University

http://www.concordia.ca/content/concordia/en/artsci/physics/research/champagne-research-group.html

Champagne Research Group

Nano-scale quantum electronics and mechanics

This is an image of an atomic mechanical breakjunction

Atomic scale Mechanical Breakjunction

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)
  • 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) Electronic and magnetic properties of Topological Insulators.

Representative publications

  1. 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

  2. S. Yigen, and A. R. Champagne, Wiedemann-Franz Relation and Thermal-transistor Effect in Suspended Graphene, Nano Letters, 14; 289 (2014). PDF Supplemental Online Information

  3. 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 Online Material

  4. J. O. Island, V. Tayari, A. C. McRae, and A. R. Champagne, Few-hundred GHz Carbon Nanotube NEMS, Nano Letters, 12; 4564 (2012) PDF Supporting Online Material

  5. 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

    Press coverage: featured in the Virtual Journal of Nanoscience and Technology

  6. 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 Online Material

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

  7. 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

  8. 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 B, 78; 205310(2008) PDF

    Press coverage: featured in Physics

  9. 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

  10. 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

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

  12. 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

Graduate students
This is an image of Serap Yigen

Serap Yigen, Ph.D.
E-mail: SerapYigen AT gmail.com
Electronic thermal conductivity in monolayer and bilayer graphene

This is an image of James Porter

James Porter, M. Sc.
E-mail: sflex59 AT hotmail.com
Electron transport in Bi2Se3 topological insulators

This is an image of Andrew McRae

Andrew McRae, Ph.D.
E-mail: andrew.c.mcrae AT gmail.com
Strain-engineering of electron transport in SWCNTs and graphene

This is an image of Marc Collette

Marc Collette, Ph.D.
E-mail: emc9396 AT gmail.com
Charge and thermal transport in defect-engineered silicon nanowires

Research Staff

Matthew Storms
E-mail: matthew.storms AT mail.mcgill.ca
High-Frequency electron transport in carbon NEMS

Undergraduate students

Patrick Janeiro, B.Sc.
E-mail: p.janeiro8 AT gmail.com
Development of a transfer and alignment method for two-dimensional crystals

Alumni

Vahid Tayari, Ph.D. (2014) - now, postdoc with T. Szkopek at McGill
Dhan Cardinal, B.Sc. (2013)
Colleen Kinross, Undergraduate, NSERC-USRA (2013)
Andrew McRae, M.Sc. (2013)
Dr. Ying Liu (2012)
Joshua Island, M.Sc.(2011) - now, PhD with H. van der Zant, TU Delft
Serap Yigen, M.Sc. (2010)
Adam Michaels, Undergraduate (2012)
Matthew Sarrasin, Undergraduate,PHYS 497 (2011)
James Porter, Undergraduate, NSERC-USRA and PHYS 497 (2011)
Roopak Singh, Undergraduate (2010)
Vincent Grenier, Undergraduate, SCOL 290 (2010)
Maryam Tabatabaei, Undergraduate (2009)

Champagne Group (Dec 2013)
This is an image of the Champagne Group
Champagne Group (August 2010)
This is an iamge of the Champagne Group
Our laboratory

Our laboratory in located in the basement of the Science Pavillion on the Loyola campus. It is a brand new 65 square-meter laboratory space with a low vibration floor, 5 meter high ceiling, sound proofed pump and service room, fume hood, gas (He, N, compressed air) and vacuum service all around the lab, as well as 2 electrical panels with isolated grounds. We have two low-temperature cryostats, a chemical vapor deposition growth chamber, and many other toys.

 

Lab2

North side of the lab.

Clean room facilities

We make use of a broad array of micro- and nano-fabrication tools at open access clean room facilities located at the Ecole Polytechnique and McGill University in Montreal

Nanoscience Group facilities

Our group is a member of the Nanoscience Group at Concordia which shares a large number of facilities

Instruments located in our lab
Cryogen-free He-3 top-loading VTI cryostat with 9 Tesla magnet
He3

Low-temperature cryostat (0.3 - 300 Kelvin). Allows a wide range of electron transport experiments in nanosystems as a function of temperature, electric and magnetic field.

Variable temperature cryostat (VTI)
VTI

Low-temperature cryostat (1.5 - 420 Kelvin). Allows a wide range of electron transport experiments in nanosystems as a function of temperature, electric and magnetic field.

Mechanical breakjunction cryostat (MBJ)
cryostat2

Low-temperature cryostat (4.2 - 300 Kelvin) equipped with a mechanical breakjunction assembly. Allows a wide range of electron transport experiments in nanosystems as a function of mechanical strain.

14 Tesla superconducting magnet
Magnet

14 Tesla magnet and its dewar which can be used with both cryostats (VTI and MBJ).

Electrical probe station
This is a photo of the Probe station

Five-probe probe station for sample characterization during microfabrication.

 

Thermal evaporator
This is a photo of theevaporator

Four-source thermal evaporator for thin film depostions.

Chemical vapor deposition system (CVD)
This is a photo of the CVD

Gas flowmeters and furnace making up the CVD. The CVD is used for the growth of single-wall carbon nanotubes (SWCNT) and microcrystals of topological insulators (Bi2Se3).

Helium leak detector and turbo-pumping station
This is a photo of a helium leak detector

High precision helium-3 and helium-4 leak detector equipped with a turbo-molecular pump. An additional high-volume turbo-pumping station is used for high vacuum pumping. Permits the operation and maintenance of helium-3 and helium-4 low-temperature cryostats.

Optical microscope
This is a photo of an optical microscope

High resolution Olympus BX51 optical microscope and XC-50 color digital camera system. Allows easy identification of graphene (carbon monolayer) crystals and characterization of micro-lithography.

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