PhD Student, Department of Physics and Astronomy BSc Physics, University of Illinois at Urbana–Champaign, 2017 Email: firstname.lastname@example.org Tyler Lindemann obtained his BS in Physics from the University of Illinois at Urbana–Champaign in 2017. He is currently a PhD student in the Department of Physics and Astronomy at Purdue University. He joined the Manfra group in […]
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PhD student, School of Electrical and Computer Engineering BSc Physics, Boston University, 2017 Email: email@example.com Sara Metti obtained her degree in physics at Boston University in 2017. She joined the Manfra group in June 2017, and she is studying InSb/GaAs heterostructues as part of Station Q Purdue. She is currently a graduate student in the […]
PhD student, Department of Physics and Astronomy BSc Physics, Auburn University (2014) Bachelor of Chemical Engineering, Auburn University (2014) Email: firstname.lastname@example.org James completed his B.Sc. in Physics and Bachelor of Chemical Engineering degrees at Auburn University. He joined the Manfra GaAs research group in May 2015, and is studying the fractional quantum Hall states in […]
Email: email@example.com Molly attends Purdue University and is pursuing a Bachelor’s Degree in Electrical Engineering with a minor in Physics. She joined the Manfra group in January of 2018
PhD student, Department of Physics and Astronomy BSc Physics, Peking University, China E-mail: firstname.lastname@example.org Tiantian Wang finished his undergraduate degree in physics at Peking University, China. He joined Prof. Manfra’s research group in July 2015, and is now working on the topological quantum computing project. He is currently a Ph.D. student in Department of Physics […]
The Manfra low temperature lab performs electrical characterization of two-dimensional electron gases in GaAs/AlGaAs heterostructures. The primary focus is on research related to the fractional quantum Hall effect (FQHE). Quick characterization of material and devices is performed with a home-made 4K dipper probe equipped with a 2 Tesla magnet while more complete measurements can be made at 300 mK in a Janis He3 cryostat equipped with a 9 Tesla superconducting magnet. Installation of an Oxford Kelvinox He3/He4 dilution refrigerator with a 15 Tesla magnet is also underway which will allow lower (T < 50 mK) temperature examination of FQHE states and measurement of their energy gaps.
The gallium nitride (GaN) MBE system is a Riber 32. The machine includes a load lock, a sample outgassing chamber, and a main growth chamber. In the main growth chamber the system is configured with 2 gallium sources, 2 aluminum sources, a nitrogen plasma source, an indium source as well as a source for silicon. It is equipped with in-situ diagnostics including a reflection high-energy electron diffraction (RHEED) gun for measuring sample surface evolution as well as a residual gas analyzer. Projects include the growth of AlGaN/GaN and AlInN/GaN heterostructures both on polar and non-polar GaN substrates for intersubband device applications. In addition this system has been used to produce the highest 2DEG mobility ever reported in an AlGaN/GaN heterostructure.
Our GaAs MBE is a Veeco Gen II system highly customized to improve overall vacuum quality and resulting crystal purity. Meticulous vacuum hygiene results in base pressure ~1x10-12 torr and all the effusion cells in our system are custom designed by our group in an effort to reduce the thermal load during growth. The lab also houses 2 ancillary vacuum chambers used for cleaning and characterization of components before loading into the MBE. One vacuum chamber has been specifically designed for gallium purification and mates with the MBE so that components can be transferred between chambers without exposure to air. This MBE system has recently produced 2DEGs with low temperature mobility in excess of 30x106cm2/Vs as well as 2DEGs exhibiting the highest excitation gap at ν=5/2 ever measured.
December 16, 2014 Prof. Manfra profiled in COS Insights Magazine. [COS Insights Magazine]
November 30, 2014 Baby girl Michelle born to Jiayi. Congratulations to Jiayi and her family.
Birck Nanotechnology Center
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Department of Physics and Astronomy
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