David E. Graf
Tallahassee,USA
Overview
27
27
years of professional experience
Work History
Research Faculty III
NHMFL
09.2012 - Current
- Develop and advance experimental techniques with a focus on high pressure measurements at high magnetic fields to explore contemporary problems in condensed matter physics.
Post-doctoral Research Associate
NHMFL
08.2008 - 09.2011
- Three-year position conducting high pressure research using diamond anvil cells in pulsed fields.
- Studied the effects of pressure on the phases and Fermiology of depleted uranium and pnictides.
Jack Crow Research Fellowship
NHMFL
08.2005 - 07.2008
- Three-year fellowship granted through a competitive application process that allowed me to conduct research on low-dimensional molecular materials and advance NMR and high-pressure instrumentation.
National Science Foundation GK-12 Fellowship
FSU
09.2002 - 08.2005
- Three-year appointment for selected graduate students to assist local educators to improve science lessons.
- Co-taught with teachers in fifth and eighth grade classrooms, covering a wide range of science topics.
Graduate Research Assistant
FSU
08.1999 - 08.2005
Education
Doctor of Philosophy - Physics
Florida State University
Tallahassee, Florida06-2005
Master of Science - Physics
Florida State University
Tallahassee, Florida08-2001
Bachelor of Science - Physics
Buffalo State College
Buffalo, NY09-1998
Skills
- Experimental Techniques for high magnetic field research:
- Torque magnetometry with capacitance or piezo-resistive cantilevers
- Tunnel diode oscillator (TDO) skin depth measurements of metals to probe Shubnikov de Haas oscillations and magnetization measurements of spin systems
- High pressure measurements of routine bulk crystals, 2D heterostructures and spin lattice systems
- 2-axis rotation measurements allowing NHMFL users to orient their samples into any position with respect to the applied magnetic field
- Cryogenics – extensive use of variable temperature inserts and He3 systems
- Design, fabrication and troubleshooting for experimental probes and cryostats
- Eg, Created several probes for a Quantum Design - Physical Property Measurement System (PPMS) that is part of the DCFF This allows users to join conventional PPMS applications and DC Field techniques
- Machine shop – Level III NHMFL machinist - extensive lathe and mill work with metals and plastics producing high pressure cells and components
- Electronics – experience fabricating RF circuits for tunnel diode oscillator measurements and basic repair work of DC Field instrumentation
- Laboratory skills:
- Effective communicator between visiting users, technicians, and control room staff
- IGOR and Origin data analysis software
- AutoDesk Inventor and Fusion packages including generating code for 3D printing and computer numerical control (CNC) output
- Labview instrument programming, control, and data acquisition software
Affiliations
American Physical Society (20 years)
Recent relevant NHMFL publications
- Fermi surface transformation at the pseudogap critical point of a cuprate superconductor, Y.W. Fang, G. Grissonnanche, A. Legros, S. Verret, F. Laliberte, C. Collignon, A. Ataei, M. Dion, J.S. Zhou, D. Graf, M.J. Lawler, P.A. Goddard, L. Taillefer and B.J. Ramshaw, Nature Physics 18 558 (2022).
- Signatures of a Quantum Griffiths Phase Close to an Electronic Nematic Quantum Phase Transition, P. Reiss, D. Graf, A.A. Haghighirad, T. Vojta and A.I. Coldea, Physical Review Letters 127 246402 (2021).
- Scale-invariant magnetic anisotropy in RuCl3 at high magnetic fields, K.A. Modic, R.D. McDonald, J.P.C. Ruff, M.D. Bachmann, Y. Lai, J.C. Palmstrom, D. Graf, M.K. Chan, F.F. Balakirev, J.B. Betts, G.S. Boebinger, M. Schmidt, M.J. Lawler, D.A. Sokolov, P.J.W. Moll, B.J. Ramshaw and A. Shekhter, Nature Physics 17 240 (2021).
- Linear-in temperature resistivity from an isotropic Planckian scattering rate, G. Grissonnanche, Y. Fang, A. Legros, S. Verret, F. Laliberte, C. Collignon, J. Zhou, D.E. Graf, P. Goddard, L. Taillefer and B. Ramshaw, Nature 595 667 (2021).
- Signatures of bosonic Landau levels in a finite-momentum superconductor, A. Devarakonda, T. Suzuki, J. Zhu, D. Graf, M. Kriener, L. Fu, E. Kaxiras and J. G. Checkelsky, Nature 599 51 (2021).
- Tuning magnetic confinement of spin-triplet superconductivity, W.C. Lin, D.J. Campbell, S. Ran, L.L. Liu, H. Kim, A.H. Nevidomskyy, D. Graf, N.P. Butch and J. Paglione, Npj Quantum Materials 5 68 (2020).
- Tuning superconductivity in twisted bilayer graphene, M. Yankowitz, S. Chen, H. Polshyn, Y. Zhang, K. Watanabe, T. Taniguchi, D. Graf, A. F. Young and C.R. Dean, Science 363 1059 (2019).
- Switching 2D magnetic states via pressure tuning of layer stacking, T.C. Song, Z.Y. Fei, M. Yankowitz, Z. Lin, Q.N. Jiang, K. Hwangbo, Q. Zhang, B.S. Sun, T. Taniguchi, K. Watanabe, M.A. McGuire, D. Graf, T. Cao, J.H. Chu, D.H. Cobden, C.R. Dean, D. Xiao and X.D. Xu, Nature Materials 18 1298 (2019).
- Extreme magnetic field-boosted superconductivity, S. Ran, L.L. Liu, Y.S. Eo, D.J. Campbell, P.M. Neves, W.T. Fuhrman, S.R. Saha, C. Eckberg, H. Kim, D. Graf, F. Balakirev, J. Singleton, J. Paglione and N.P. Butch, Nature Physics 15 1250 (2019).
- Dynamic band-structure tuning of graphene moire superlattices with pressure, M. Yankowitz, J. Jung, E. Laksono, N. Leconte, B.L. Chittari, K. Watanabe, T. Taniguchi, S. Adam, D. Graf and C.R. Dean, Nature 557 404 (2018).
- Full publication list available: https://scholar.google.com/citations?user=uPYFOGUAAAAJ&hl=en&oi=ao
Timeline
Research Faculty III
NHMFL
09.2012 - Current
Post-doctoral Research Associate
NHMFL
08.2008 - 09.2011
Jack Crow Research Fellowship
NHMFL
08.2005 - 07.2008
National Science Foundation GK-12 Fellowship
FSU
09.2002 - 08.2005
Graduate Research Assistant
FSU
08.1999 - 08.2005
Master of Science - Physics
Florida State University
Bachelor of Science - Physics
Buffalo State College
Doctor of Philosophy - Physics
Florida State University