Postdoctoral Research Fellow, Miller Institute for Basic Research in Science, University of California, Berkeley
3028 College Ave, Berkeley 94705 CA | +1(857)272-6992 | gvarnavides@berkeley.edu | gvarnavides.com | @_gvarnavides
2017-2022 Ph.D., Materials Science and Engineering , Massachusetts Institute of Technology and Harvard University, Cambridge, MA, USA.
- Co-advisors: Prof. P. Narang (Harvard) and Prof. P. Anikeeva (MIT).
- Thesis: Electron Hydrodynamics in Crystalline Solids.
2013-2017 B.S., Materials Science and Engineering , Massachusetts Institute of Technology, Cambridge, MA, USA.
B.S., Civil and Environmental Engineering , Massachusetts Institute of Technology, Cambridge, MA, USA.
2022 Outstanding Ph.D. Thesis Research Award, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
Miller Institute Postdoctoral Fellow 2022-2025 (awarded and accepted), Miller Institute for Basic Research in Science, University of California, Berkeley
Heising-Simons Postdoctoral Fellow 2022-2024 (awarded), Kavli Energy NanoScience Institute, University of California, Berkeley
Kavli Institute at Cornell Postdoctoral Fellow 2022-2024 (awarded), Kavli Institute at Cornell, Cornell University
2021 Materials Research Society Graduate Student Gold Award, MRS Fall 2021 Meeting.
John Wulff Award for Excellence in Teaching an Undergraduate Subject, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
2020 Hugh Hampton Young Fellow, Massachusetts Institute of Technology.
2019 Best Paper Award for Second or First Year Student, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
2017
Piper Presidential Graduate Fellow, Massachusetts Institute of Technology.
Horace A. Lubin Award for Outstanding Service to the DMSE Community, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
Juan Hermosilla Prize for exceptional talent and potential at the intersection of mechanics, materials & structures, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology.
2016 Julian Szekely Award for the Outstanding Junior, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
Undergraduate Student Teaching Award in Teaching an Undergraduate Subject, Department of Materials Science and Engineering, Massachusetts Institute of Technology.
2023
Dose-Efficient Single-Particle Analysis: Joint Ptychographic Tomography and Tilt-Corrected Bright Field STEM, Chan Zuckerberg Institute for Advanced Biological Imaging (CZII), Redwood City, CA, USA.
Joint Ptychographic Tomography: From Magnetic Vector Potentials to Single Particle Analysis, Rosalind Franklin Insitute (RFI) and Electron Physical Science Imaging Centre (ePSIC), Harwell, Oxfordshire, UK.
Inverse Scattering Problems in S/TEM Using Electron Ptychography: From Three-Dimensions to Magnetic Vector Potentials to Biological Samples, University of Vienna, Physics, Virtual Seminar.
Atomic Resolution Imaging of Anti-Ferromagnetism Using Electron Ptychography, Korean Insitute of Energy Technology (KENTECH), Institute for Environmental and Climate Technology, Naju, South Korea.
Exotic Current Densities and How to (Computationally) Image Them, Massachusetts Institute of Technology (MIT), Materials Science and Engineering, Boston, MA, USA.
2022
Electron Hydrodynamics in Crystalline Solids: Spatially-Resolved Transport Framework, University of California Berkeley (UCB), Physics, Berkeley, CA, USA.
Electron Hydrodynamics in Crystalline Solids: Experimental Observations and Spatially-Resolved Transport Framework, University of California Los Angeles (UCLA), Physics, Los Angeles, CA, USA.
Nanoscale Imaging of Non-uniform Current Densities in Anisotropic Electron Fluids, Lawrence Berkeley National Laboratory (LBNL), Molecular Foundry, Berkeley, CA, USA.
Electron Hydrodynamics in Crystalline Solids: Microscopic Origins, Mesoscopic Size Effects, and Macroscopic Observables, Max Planck Institute (MPI), Chemical Physics of Solids, Virtual Seminar.
Electron Hydrodynamics in Crystalline Solids: Microscopic Origins, Mesoscopic Size Effects, and Macroscopic Observables, Northwestern University (NU), Materials Science and Engineering, Evanston, IL, USA.
2021
Imaging anisotropic electron fluids with high spatial resolution, Cornell University, Kavli Institute at Cornell, Virtual Seminar.
For a complete list of publications, please see my Google Scholar profile. *Denotes equal contribution.
1. G. Varnavides, S.M. Ribet, R. Yalisove, J.E. Moore, C. Ophus, M.C. Scott, Atomic Resolution Imaging of Anti-Ferromagnetism Using Electron Ptychography.
2. G. Varnavides, A.S. Jermyn, P. Anikeeva, P. Narang, SpaRTaNS: Spatially Resolved Transport of Nonequilibrium Species.
3. G. Varnavides*, S.M. Ribet*, S.E. Zeltmann, Y. Yu, B.H. Savitzky, V.P. Dravid, M.C. Scott, C. Ophus, Iterative Phase Retrieval Algorithms for Scanning Transmission Electron Microscopy, arXiv:2309.05250 (2023), Submitted.
4. G. Varnavides*, A.S. Jermyn*, P. Anikeeva, P. Narang, Probing carrier interactions using electron hydrodynamics, arXiv:2204.06004 (2022), Submitted.
2023
5. G. Varnavides, A. Yacoby, C. Felser, P. Narang, Charge Transport and Hydrodynamics in Materials, Nat Rev Mater 8, 726-741 (2023).
2022
6. R.A. Kowalski, J.R. Nolen, G. Varnavides, S.M. Silva, J.E. Allen, C.J. Ciccarino, D.M. Juraschek, S. Law, P. Narang, J.D. Caldwell, Mid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2, Adv Optical Mater 10, 2200933 (2022).
7. Y. Wang*, G. Varnavides*, P. Anikeeva, J. Gooth, C. Felser, P. Narang, Generalized design principles for hydrodynamic electron transpor in anisotropic metals, Phys Rev Materials 6, 083802 (2022).
8. L. Y. Maeng, D. Rosenfeld, G. J. Simandl, F. Koehler, A. W. Senko, J. Moon, G. Varnavides, M. F. Murillo, A. E. Reimer, A. Wald, P. Anikeeva, A. S. Widge, Probing Neuro-Endocrine Interactions Through Wireless Magnetothermal Stimulation of Peripheral Organs, Frontiers in Neuroscience, 949 (2022).
9. G. Varnavides*, Y. Wang*, P. J.W. Moll, P. Anikeeva, P. Narang, Mesoscopic finite-size effects of unconventional electron transport in PdCoO2, Phys Rev Materials, 6, 045002 (2022).
2021
10. C. A. Garcia, D. M. Nenno, G. Varnavides, P. Narang, Anisotropic phonon-mediated electronic transport in chiral Weyl semimetals, Phys Rev Materials, 5, L091202 (2021).
11. U. Vool*, A. Hamo*, G. Varnavides*, Y. Wang*, T. X. Zhou, N. Kumar, Y. Dovzhenko, Z. Qiu, C. A. Garcia, A. T. Pierce, J. Gooth, P. Anikeeva, C. Felser, P. Narang, A. Yacoby, Imaging phonon-mediated hydrodynamic flow in WTe2, Nat Phys, 1745-2481 (2021).
12. X. Tian*, X. Yan*, G. Varnavides*, Y. Yuan, D. S. Kim, C. J. Ciccarino, P. Anikeeva, M.-Y. Li, L.-J. Li, P. Narang, X. Pan, J. Miao, Capturing 3D atomic defects and phonon localization at the 2D heterostructure interface, Sci Adv, 7: eabi6699 (2021).
13. M. R. van Delft, Y. Wang, C. Putzke, J. Oswald, G. Varnavides, C. A. C. Garcia, C. Guo, H. Schmid, V. Suss, H. Borrmann, J. Diaz, Y. Sun, C. Felser, B. Gotsmann, P. Narang, P. J.W. Moll, Sondheimer oscillations as a probe of non-ohmic flow in WP2 crystals, Nat Commun 12, 4799 (2021).
14. J. Park*, F. Koehler*, G. Varnavides, M.-J. Antonini, and P. Anikeeva , Influence of Magnetic Fields on Electrochemical Reactions of Redox Cofactor Solutions. Angew. Chem. Int. Ed.. (2021).
15. G. Varnavides, A. Mortensen, W.C. Carter, Simulating Infiltration as a Sequence of Pinning and De-pinning Processes, Acta Materialia 210, 116831 (2021).
16. K. Reidy*, G. Varnavides*, J.D. Thomsen, A. Kumar, T. Pham, A. M. Blackburn, P. Anikeeva, P. Narang, J. M. LeBeau, F. M. Ross, Direct imaging and electronic structure modulation of moiré superlattices at the 2D/3D interface, Nat Commun 12, 1290 (2021).
2020
17. G. Varnavides*, A. S. Jermyn*, P. Anikeeva, P. Narang, Electron hydrodynamics in anisotropic materials, Nat Commun 11, 4710 (2020).
18. D. Gregurec, A. W. Senko, A. Chuvilin, P. D. Reddy, A. Sankararaman, D. Rosenfeld, P.-H. Chiang, F. Garcia, I. Tefel, G. Varnavides, E. Ciocan, P. Anikeeva, Magnetic Vortex Nanodiscs Enable Remote Magnetomechanical Neural Stimulation, ACS nano 14, 7 (2020).
19. P. Periwal, J. D. Thomsen, K. Reidy, G. Varnavides, D. N. Zakharov, L. Gignac, M. C. Reuter, T. J. Booth, S. Hofmann, F. M. Ross, Catalytically mediated epitaxy of 3D semiconductors on van der Waals substrates, Applied Physics Reviews 7, 031402 (2020).
20. J. Moon, M. G. Christiansen, S. Rao, C. Marcus, D. C. Bono, D. Rosenfeld, D. Gregurec, G. Varnavides, P.-H. Chiang, S. Park, P. Anikeeva, Magnetothermal Multiplexing for Selective Remote Control of Cell Signaling, Advanced Functional Materials 30, 36 (2020).
21. D. Rosenfeld, A. W. Senko, J. Moon, I. Yick, G. Varnavides, D. Gregurec, F. Koehler, P.-H. Chiang, M. Christiansen, L. Y. Maeng, A. S. Widge, P. Anikeeva, Transgene-free remote magnetothermal regulation of adrenal hormones, Science advances 6, 15 (2020).
2019
22. G. Varnavides, A. S. Jermyn, P. Anikeeva, P. Narang, Nonequilibrium phonon transport across nanoscale interfaces, Phys Rev B, 100, 115402 (2019).
23. S. Rao, R. Chen, A. A. LaRocca, M. G. Christiansen, A. W. Senko, C. H. Shi, P.-H. Chiang, G. Varnavides, J. Xue, Y. Zhou, S. Park, R. Ding, J. Moon, G. Feng, P. Anikeeva, Remotely controlled chemomagnetic modulation of targeted neural circuits, Nat Nanotechnol 14, 967 (2019).
24. M. Kanik*, S. Orguc*, G. Varnavides, J. Kim, T. Benavides, D. Gonzalez, T. Akintilo, C. C. Tasan, A. P. Chandrakasan, Y. Fink, P. Anikeeva, Strain-programmable fiber-based artificial muscle, Science 365, 6449 (2019).
25. J. Vukajlovic-Plestina, W.Kim, L. Ghisalberti, G. Varnavides, G. Tutuncuoglu, H. Potts, M. Friedl, L. Guniat, W.C. Carter, V.G. Dubrovskii, A. Fontcuberta i Morral, Fundamental aspects to localize self-catalyzed III-V nanowires on silicon, Nat Commun 10, 869 (2019).
2023
26. G. Varnavides, S.M. Ribet, R. Yalisove, J.E. Moore, C. Ophus, M.C. Scott, Simultaneous Electrostatic and Magnetic Vector Potential Phase Retrieval Using Electron Ptychography, Microsc Microanal 29, 278-279 (2023).
27. S.M. Ribet, S.E. Zeltmann, G. Varnavides, R. Dos Reis, V.P. Dravid, C. Ophus, Phase Diversity in Ptychographic Reconstructions with a Programmable Phase Plate, Microsc Microanal 29, 296-297 (2023).
28. B.H. Savitzky, A. Rakowski, A. Bruefach, S.M. Ribet, G. Varnavides, S.E. Zeltmann, T. Mishra, M.C. Scott, A.M. Minor, C. Ophus, Architecture, Development Cycle, and Governance Considerations in Co-created Research Sofware: the Example of py4DSTEM and Analysis of 4D-STEM Data, Microsc Microanal 29, 339-341 (2023).
2020
29. X. Chen, G. Varnavides, P. Anikeeva, J. LeBeau, Quantitative Analysis of Correlated Atomic Displacements via Diffuse Electron Scattering, Microsc Microanal 26, 718-720 (2020).
30. K. Reidy, G. Varnavides, J.D. Thomsen, A. Blackburn, T. Pham, A. Kumar, J. LeBeau, F.M. Ross, Forbidden Reflection Moiré Patterns in Metal-2D Material Interfaces, Microsc Microanal 26, 860-863 (2020).
2023
Simultaneous Electrostatic and Magnetic Vector Potential Phase Retrieval Using Electron Ptychography, Microscopy and Microanalysis (M&M) 2023, Minneapolis, MN, USA.
Three-Dimensional Imaging of Anti-Ferromagnetism with Atomic Resolution Using Electron Ptychography, International Microscopy Congress (IMC) 2023, Busan, South Korea.
Three-Dimensional Inverse Scattering Problems Using Electron Ptychography: Atomic-Scale Imaging of Magnetization and Thermal Diffuse Scattering, Materials Research Society (MRS) Fall 2023, Boston, MA, USA.
2022
Investigating the Role of Microscopic Interactions in Electron Hydrodynamics, Materials Research Society (MRS) Spring 2022, Honolulu, HI, USA.
SpaRTaNS: Spatially Resolved Transport of Non-equilibrium Species, American Physical Society (APS) March 2022 Meeting, Chicago, IL, USA.
2021
Electron Hydrodynamics: Microscopic Origins and Effects of Macroscale Geometries, Materials Research Society (MRS) Spring 2021, Virtual Conference.
Electron Hydrodynamics: Microscopic Origins, American Physical Society (APS) March 2021 Meeting, Virtual Conference.
2020
Temperature-Resolved Observations and Predictions of Phonon-Mediated Hydrodynamic Flow of Electrons in WTe2, Materials Research Society (MRS) Fall 2020, Virtual Conference.
Teaching Materials Science Using the Wolfram Language, Wolfram Technology Conference 2020, Virtual Conference.
2019
Crystal Symmetry and Electron Hydrodynamics: A Group Theory Approach, Materials Research Society (MRS) Fall 2019 Meeting, Boston, MA, USA.
Spatially-Resolved Non-equilibrium Phonon Transport Across Nanoscale Interfaces, American Physical Society (APS) March Meeting 2019, Boston, MA, USA.
2018
Ab initio Predictions of Spatially-Resolved Non-equilibrium Coherent Transport Phenomena, Materials Research Society (MRS) Fall 2018 Meeting, Boston, MA, USA.
Non-Equilibrium Phonon Transport Across Semi-Coherent Interfaces, 16th International Conference on Phonon Scattering in Condensed Matter, Nanjing, China.
2017
(De)Generative Art, Wolfram Technology Conference 2017, Champaign, IL, USA.
2016
Capillarity in Pressure Infiltration Part I & II: Experiment and Modelling, Materials Science & Technology (MS&T16), Salt Lake City, UT, USA.
2021 Finite-size Effects of Electron Transport in Anisotropic Quasi-Two Dimensional Metals, Materials Research Society (MRS) Fall 2021 Meeting, Boston, MA, USA.
2017
Darcy-Brinkman Multiscale Modelling Applied on the Mosul Dam, New England Mechanics 2017 Workshop, Cambridge, MA, USA.
2016
Simulating Capillarity in Metal Infiltration, Materials Science & Technology (MS&16), Salt Lake City, UT, USA.
2022 Instructor-G, Department of Materials Science and Engineering, Cambridge, MA, USA
- Mathematics and Computational Thinking for Materials Scientists and Engineers I (3.029)
2020 Graduate Teaching Assistant, Department of Materials Science and Engineering, Cambridge, MA, USA
2016-2017 Undergraduate Teaching Assistant,Department of Materials Science and Engineering, Cambridge, MA, USA
2017-2022 Generative Art Workshop, 4-day IAP workshop, Massachusetts Institute of Technology, Cambridge, MA, USA.
Co-taught with Emma Vargo, Amina Matt, Jovana Andrejevic, and Nina Andrejevic.
2022-present Teaching multiple short courses to 9th grade Physics and 11th grade Engineering Honors students at the El-Cerrito high school.
2019-2021 Graduate Materials Council (GMC) officer on the Departmental Committee on Graduate Studies (DCGS).
2015-2021 Teen Counselor and Teen Advisor for Camp Kesem, a student-run organization helping children through and beyond a parent’s cancer.
2022-present Microscopy Society of America (MSA).
2018-present Materials Research Society (MRS).
American Physical Society (APS).
2017-present Tau Beta Pi (ΤΒΠ) - Engineering Honor Society Member.
Chi Epsilon (ΧΕ) - Civil Engineering Honor Society Member.
Last updated: November 2023