Feenstra Group (Carnegie Mellon University)
Semiconductor Surfaces & Interfaces

This Web page contains links to activities in the research group of Prof. Randall Feenstra in the Physics Department at Carnegie Mellon University.

• Past Group Members (with links to a few Ph.D. theses):

  • Ashutosh (former graduate student, now at Intel, Oregon)
  • Huajie Chen (former graduate student, now at IBM, East Fishkill)
  • Costel Constantin (former postdoc, now at James Madison University)
  • Sergio de la Barrera (former graduate student, now at University of Toronto)
  • Yang Dong (former graduate student, now at Western Digital, Fremont, California)
  • Roberto Duca (former visiting research scientist, now at Infineon, Germany)
  • Patrick Fisher (former postdoc, now at Nokomis Inc., Pittsburgh)
  • Sandeep Gaan (former graduate student, now at Global Foundaries); Gaan Ph.D. thesis , Chapter 3 of Gaan Ph.D. thesis
  • Rachel Goldman (former postdoc, now at University of Michigan)
  • Bruno Grandidier (former postdoc, now at ISEN, Lille, France)
  • Guowei He (former graduate student, now at CGG, Houston)
  • Nobuyuki Ishida (former visiting research scientist, now at National Institute for Materials Science, Japan)
  • Chae-Deok Lee (former research scientist, now at LG Electronics, Korea)
  • Jun Li (former graduate student, now at Google)
  • Luxmi (former graduate student, now at Intel)
  • Patrick Mende (former graduate student, now at Expedia Group, Seattle); Mende Ph.D. thesis
  • Shu Nie (former graduate student, now at Sandia National Lab, California)
  • Art Smith (former postdoc, now at Ohio University)
  • Hugh McKay (former graduate student, now at IMRA America, Michigan)
  • Vidhya Ramachandran (former graduate student, now at Apple)
  • Wattaka Sitaputra (former postdoc, now employed in Thailand)
  • Nishtha Srivastava (former graduate student, now at Intel)
  • Dacen Waters (former graduate student, now at University of Denver)
  • Wei Yan (former postdoc, now at Beijing Normal University, China)

• Group Photos:

  • 2002
  • 2008
  • 2014
  • 2015

• Description of Research Activities (Past and Present)

  • Scanning Tunneling Microscopy
  • Molecular Beam Epitaxy
  • Epitaxial Graphene on SiC
  • Low-Energy Electron Microscopy
  • Two-dimensional Materials

• Posted Software

  • SEMITIP, VERSION 1. A Poisson solver to evaluate the potential distribution around a probe tip in proximity to a semiconductor surface.
  • SEMITIP, VERSION 2. Incorporates a number of improvements, and in particular permits the inclusion of a distribution of surface states.
  • SEMITIP, VERSION 3. Incorporates a new coordinate system in the vacuum, for better convergence in certain types of problems.
  • SEMITIP, VERSION 4. Allows computation of tunnel current, in addition to the potential distribution.
  • SEMITIP, VERSION 5. Permits self-consistent computations, important for situations of accumulation or inversion.
  • SEMITIP, VERSION 6. Permits computations for various dimensionalities, geometries, and types of tunnel current evaluation.
  • WaveTrans. Permits construction of real-space wavefunctions based on the WAVECAR output from VASP, the Vienna Ab-initio Simulation Package.

• Picture Gallery

  • Dislocation intersecting the surface of GaN(0001), illustrating spiral growth mode. Image appeared on the cover of the 14 August 1998 issue of Science. (Same image in blue or red.) Original version of image appeared in J. Vac. Sci. Technol.
  • Surface domain boundary on Si(111)2x1.
  • STM image of the GaAs(110) surface. Gallium atoms (empty states) are pictured in green, and arsenic atoms (filled states) are shown in red.
  • Defect on GaAs(110). GaAs(110) #1. GaAs(110) #2.
  • Si(111)5x5 #1. Si(111)5x5 #2. Si(111)5x5 #3. Si(111)5x5 #4. Si(111)7x7.

• Publications

  Preprints of all of the group's publications.
  Google scholar list of publications and citations.

• Carnegie Mellon Physics Department

  Departmental WWW page and information server

• Acknowledgements

  We are grateful to the National Science Foundation, the Office of Naval Research, the Air Force Office of Scientific Research, and the SRC/DARPA STARnet program for supporting the research activities described above.