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Papers¶
2026
S. M. Ribet, M. Danaie, W. P. M. de Kleijne, A. R. C. McCray, F. Allars, C. S. Allen, C. Ophus, G. Varnavides, “Real-space overlap is not enough: ambiguity in nanobeam iterative ptychography,” arXiv, 2608.30359, 2026.
M. Palos, L. Spillane, G. Topore, Y. Li, D. Pesquera, C. Ophus, S. M. Ribet, M. S. Conroy, “Programmable Beam Control for Electron Energy-Loss Spectroscopy and Ptychography,” Microsc. Microanal., 32(4), 2026.
G. Varnavides, W. P. M. de Kleijne, S. M. Ribet, “The ABCs of phase retrieval: Connecting the acronyms of scanning transmission electron microscopy,” MRS Bulletin, 51, 2026.
M. K. Wall, A. J. Pattison, E. S. Barnard, S. M. Ribet, P. Ercius, “TEM Agent: enhancing transmission electron microscopy with modern AI tools,” npj Comput. Mater., 2026.
S. Lee, S. M. Ribet, A. R. C. McCray, A. Barnum, J. A. Dionne, and C. Ophus, “Unsupervised clustering algorithm for efficient processing of 4D-STEM and 5D-STEM data,” Microsc. Microanal., 32(3), 2026.
D. Lee, S. Oaks-Leaf, H. Ma, J. He, Z. Wang, Y. Shi, E. Ahn, K. C. Bustillo, C. Song, S. M. Ribet, R. Dhall, C. Ophus, M. Asta, J. Yang, Y. Xia, D. T. Limmer, H. Zheng, “Nanocrystal geometry governs phase transformation pathways in palladium hydride,” ACS Nano, 20(21), 2026.
E. K. Neidhart, S. M. Ribet, T. A. Lee, L. Kearney, K. C. Bustillo, E. A. Dailing, M. Hua, C. Ophus, S. N. Fricke, A.-Y. Song, J. A. Reimer, E. J. Alexanian, J. M. Atkin, B. A. Helms, F. A. Leibfarth, “Polyolefin blends with co-continuous architectures enabled by dynamic covalent crosslinking,” Sci. Adv., 12(20), 2026.
G. Varnavides, J. M. Bekkevold, S. M. Ribet, M. C. Scott, L. Jones, C. Ophus, “Beyond contrast transfer: spectral SNR as a dose-aware metric for STEM phase retrieval,” Microsc. Microanal., 32(2), 2026.
G. Varnavides, J. M. Bekkevold, S. M. Ribet, M. C. Scott, L. Jones, C. Ophus, “Relaxing direct ptychography sampling requirements via parallax imaging insights,” Microsc. Microanal., 32(2), 2026.
T. Kochetkova, S. M. Ribet, L. M. Vogl, D. Casari, R. Dhall, P. K. Zysset, A. M. Minor, P. Schweizer, “Structural and Mechanical Analysis of Individual Mineralized Collagen Fibrils Using In Situ Transmission Electron Microscopy,” ACS Nano, 20(12), 2026.
H. P. Bhusal, K. Tanaka, S. Zeltmann, C. Hanley, C. Ophus, K. C. Bustillo, S. M. Ribet, C. Gonzalez, B. Zhen, J. Ciston, Z. Ge, J. C. Lashley, A. K. Zettl, J. Velasco, Jr., W. Chen, and A. Yan, “Identifying Strain Stacking Boundaries between Multiphase Domains in Atomically Thin Two-Dimensional Magnets,” ACS Nano, 20(11), 2026.
Y. Liu, Z. Li, D. Sarkar, S. M. Ribet, H. Zhao, H. Xie, P. Yanda, J. Li, J. Dong, A. Yan, C. Shekhar, Q. Yan, G. J. Snyder, M. A. Grayson, C. Felser, R. dos Reis, C. Wolverton, M. G. Kanatzidis, and V. P. Dravid, “Structural Heterogeneity in Medium-Entropy AgMnSbPbTe4 for Glassy Thermal Transport and High Thermoelectric Performance,” JACS, 148(2), 2026.
E. D. I. Tillotson, W. Thornley, W. Talbott, A. S. Eggeman, D. Kriuchkova, S. Sullivan-Allsop, M. Smith, X. Liu, A. Slattery, P. L. Yap, D. Losic, Z. Xu, H. Wang, J. Ciston, A. Rakowski, S. M. Ribet, B. H. Savitzky, M. E. Schuster, C. S. Allen, D. Douglas-Henry, V. Nicolosi, A. Herzing, J. O’Connell, E. J. Olivier, J. Neethling, Y. Zou, E. C. Duran, R. Cai, D. Ngo, R. Gorbachev, J. Haas, M. Schlegel, J. C. Meyer, A. Centeno, A. Pesquera, A. Zurutuza, S. Kang, J. Park, I. Erofeev, U. Mirsaidov, C. Ophus, C. Rentenberger, T. Waitz, J. Kotakoski, A. Roy, R. Arenal, A. Pollard and S. Haigh, “A large interlaboratory electron diffraction study of monolayer graphene,” 2D Mater., 13, 025007, 2026.
D. O. Byrne, S. M. Ribet, D. Kepaptsoglou, Q. M. Ramasse, C. Ophus, F. I. Allen, “Fabrication and characterization of boron-terminated tetravacancies in monolayer hBN using STEM, EELS and electron ptychography,” Ultramicroscopy, 282, 114305, 2026.
2025
A. R. C. McCray, S. M. Ribet, G. Varnavides, C. Ophus, “Deep generative priors for robust and efficient electron ptychography,” arXiv, 2511.07795, 2025.
A. T. Hoang, T. Neilson, K. Xu, Y. Yang, S. M. Ribet, T. Peña, T. D’Acunto, Y. Suh Song, A. E. O. Persson, W. Millsaps, C. Ophus, M. R. Rosenberger, E. Pop, A. J. Mannix, “High-current p-type transistors from precursor-engineered synthetic monolayer WSe2,” arXiv, 2509.07299, 2025.
J. M. Bekkevold, S. M. Ribet, M. C. Scott, L. Jones, C. Ophus, G. Varnavides, “Evaluating the transfer of information in phase retrieval STEM techniques,” Elemental Microscopy, 2025.
C. Ophus, S. M. Ribet, G. Varnavides, J. Madsen, T. Susi, “A practical guide to scanning and transmission electron microscopy simulations,” Elemental Microscopy, 2025.
J. Lee, S. W. Song, M. G. Cho, G. Varnavides, S. M. Ribet, C. Ophus, M. C. Scott, M. L. Whittaker, “PhaseT3M: 3D imaging at 1.6 Å resolution via electron cryo-tomography with nonlinear phase retrieval,” Nat. Commun., 17(690), 2025.
E. W. C. Terzoudis-Lumsden, A. Sadri, M. Weyland, L. Bourgeois, S. M. Ribet, G. Varnavides, C. Ophus, T. C. Petersen, S. D. Findlay, “Quantitative structure determination from experimental four-dimensional scanning transmission electron microscopy via the scattering matrix,” Microsc. Microanal., 31(6), 2025.
S. M. Ribet*, R. Dhall*, C. Ophus, K. C. Bustillo, “Multi-angle precession electron diffraction (MAPED): a versatile approach to 4D-STEM precession,” Microsc. Microanal., 31(6), 2025.
A. J. Pattison, S. M. Ribet, M. M. Noack, G. Varnavides, K. Park, E. Kirkland, J. Park, C. Ophus, P. Ercius, “BEACON — automated aberration correction for scanning transmission electron microscopy using bayesian optimization,” npj Comput. Mater., 11(274), 2025.
E. R. Kennedy*, S. M. Ribet*, I. S. Winter, C. A. Kohnert, Y. Wang, K. C. Bustillo, C. Ophus, B. K. Derby, “Mapping strain and structural heterogeneities around bubbles in amorphous ionically conductive Bi2O3,” Materials & Design, 256, 114282, 2025.
D. O. Byrne, S. M. Ribet, C. Bustillo, C. Ophus, F. I. Allen, “Neutral but impactful: Gallium cluster-induced nanopores from beam-blanked gallium ion sources,” Microsc. Microanal., 31(4), 2025.
A. Scheid, Q. Song, S. M. Ribet, C. Ophus, Y. E. Suyolcu, D. G. Schlom, T. Heil, P. A. van Aken, “Atomic-Scale Mechanisms of Nucleation and Stabilization in CuCrO2 and CuFeO2 Delafossite Thin Films on Al2O3,” Adv. Mater. Interfaces, 2500218, 2025.
A. R. C. McCray, S. M. Ribet, G. Varnavides, C. Ophus, “Accelerating iterative ptychography with an integrated neural network,” J. Microsc., 2025.
S. Husremović, O. Gonzalez, B. H. Goodge, L. S. Xie, Z. Kong, W. Zhang, S. H. Ryu, S. M. Ribet, S. S. Fender, K. C. Bustillo, C. Song, J. Ciston, T. Taniguchi, K. Watanabe, C. Ophus, C. Jozwiak, A. Bostwick, E. Rotenberg, D. K. Bediako, “Tailored topotactic chemistry unlocks heterostructures of magnetic intercalation compounds,” Nat. Commun., 16(1208), 2025.
S. S. Welborn, C. Harris, S. M. Ribet, G. Varnavides, C. Ophus, B. Enders, P. Ercius, “Streaming large-scale electron microscopy data to a supercomputing facility,” Microsc. Microanal., 31(1), 2025. 2024
G. Varnavides, S. M. Ribet, C. Ophus, “Tilt-Corrected BF-STEM,” Elemental Microscopy, 2024.
E. Kennedy, J. Valdez, Y. Wang, S. M. Ribet, K. Sickafus, C. Kreller, B. Uberuaga, B. Derby, “Insights into defect kinetics, mass transport, and electronic structure from spectrum effects in ion-irradiated Bi2O3,” J. Mater. Chem. A, 12(31445), 2024.
S. P. Gleason, A. Rakowski, S. M. Ribet, S. E. Zeltmann, B. H. Savitzky, M. Henderson, J. Ciston, C. Ophus, “Random forest prediction of crystal structure from electron diffraction patterns incorporating multiple scattering,” Phys. Rev. Mater., 8(093802), 2024.
B. Küçükoğlu, I. Mohammed, R. C. Guerrero-Ferreira, S. M. Ribet, G. Varnavides, M. L. Leidl, K. Lau, S. Nazarov, A. Myasnikov, M. Kube, J. Radecke, C. Sachse, K. Müller-Caspary, C. Ophus, H. Stahlberg, “Low-dose cryo-electron ptychography of proteins at sub-nanometer resolution,” Nat. Commun., 15(8062), 2024.
S. M. Ribet, G. Varnavides, C. C. S. Pedroso, B. E. Cohen, P. Ercius, M. C. Scott, C. Ophus, “Uncovering the three-dimensional structure of upconverting core-shell nanoparticles with multislice electron ptychography,” Appl. Phys. Lett., 124(240601), 2024 (featured article).
C. G. Torres-Castanedo, D. P. Goronzy, T. Pham, A. McFadden, N. Materise, P. M. Das, M. Cheng, D. Lebedev, S. M. Ribet, M. J. Walker, D. A. Garcia-Wetten, C. J. Kopas, J. Marshall, E. Lachman, N. Zhelev, J. A. Sauls, J. Y. Mutus, C. R. H. McRae, V. P. Dravid, M. J. Bedzyk, M. C. Hersam, “Formation and microwave losses of hydrides in superconducting niobium thin films resulting from fluoride chemical processing,” Adv. Funct. Mater., 2401365, 2024.
K. Koo, Z. Li, Y. Liu, S. M. Ribet, X. Fu, Y. Jia, X. Chen, G. Shekhawat, P. J. M. Smeets, R. Dos Reis, J. Park, J. M. Yuk, X. Hu, V. P. Dravid, “Ultrathin silicon nitride microchip for in-situ/operando microscopy with high spatial resolution and spectral visibility,” Sci. Adv., 10(3), 2024.
2023
G. Varnavides*, S. M. Ribet*, S. E. Zeltmann, Y. Yu, B. Savitzky, V. P. Dravid, M. C. Scott, C. Ophus, “Iterative phase retrieval algorithms for scanning transmission electron microscopy,” arXiv, 2309.05250, 2023.
S. M. Ribet, S. E. Zeltmann, K. C. Bustillo, R. Dhall, P. Denes, A. M. Minor, R. dos Reis, V. P. Dravid, C. Ophus, “Design of electrostatic aberration correctors for scanning transmission electron microscopy,” Microsc. Microanal., 29(6), 1950–1960, 2023.
S. M. Ribet, C. Ophus, R. Dos Reis, V. P. Dravid, “Defect contrast with 4D-STEM: Understanding crystalline order with virtual detectors and beam modification,” Microsc. Microanal., 29(3), 1087–1095, 2023.
S. Husremović, B. H. Goodge, M. P. Erodici, K. Inzani, A. Mier, S. M. Ribet, K. C. Bustillo, T. Taniguchi, K. Watanabe, C. Ophus, S. M. Griffin, D. K. Bediako, “Encoding multistate charge order and chirality in endotaxial heterostructures,” Nat. Commun., 14(6031), 2023.
B. Shindel, S. M. Ribet, C. Harms, V. Nandwana, V. P. Dravid, “Nano-SCHeMe: Nanomaterial sponge coatings for heavy metals, an environmental remediation platform,” ACS EST Water, 3(8), 2120–2129, 2023.
Y. Liu, H. Xie, Z. Li, Y. Zhang, C. D. Malliakas, M. A. Malki, S. M. Ribet, S. Hao, T. Pham, Y. Wang, X. Hu, R. Dos Reis, G. J. Snyder, C. Uher, C. Wolverton, M. G. Kanatzidis, V. P. Dravid, “Unraveling the role of entropy in thermoelectrics: Entropy-stabilized quintuple rock salt PbGeSnCdxTe3+x,” JACS, 145(15), 8677–8688, 2023.
M. Cheng, A. K. Iyer, A. P. Douvalis, S. M. Ribet, M. G. Kanatzidis, V. P. Dravid, “Cation segregation in alloyed thiophosphates Fe2-xCoxP2S6,” Chem. Mater., 35(3), 1458–1465, 2023.
2022
A. A. Murthy, P. M. Das, S. M. Ribet, C. Kopas, J. Lee, M. J. Reagor, L. Zhou, M. J. Kramer, M. C. Hersam, M. Checchin, A. Grasselino, R. Dos Reis, V. P. Dravid, A. Romanenko, “Developing a chemical and structural understanding of the surface oxide in a niobium superconducting qubit,” ACS Nano, 16(10), 17257–17262, 2022.
K. A. Parker, S. M. Ribet, B. R. Kimmel, R. Dos Reis, M. Mrksich, V. P. Dravid, “Scanning transmission electron microscopy in a scanning electron microscope for the high-throughput imaging of biological assemblies,” Biomacromolecules, 23(8), 3235–3242, 2022.
K. Koo*, S. M. Ribet*, C. Zhang, P. J. M. Smeets, R. Dos Reis, X. Hu, V. P. Dravid, “Effects of the encapsulation membrane in operando scanning transmission electron microscopy,” Nano Lett., 22(10), 4137–4144, 2022.
2021
S. M. Ribet, B. Shindel, R. Dos Reis, V. Nandwana, V. P. Dravid, “Phosphate elimination and recovery lightweight (PEARL) membrane: A sustainable environmental remediation approach,” PNAS, 118(23), 2021.
S. M. Ribet*, A. A. Murthy*, E. W. Roth, R. Dos Reis, V. P. Dravid, “Making the most of your electrons: Challenges and opportunities in characterizing hybrid interfaces with STEM,” Mater. Today, 50, 100–115, 2021 (invited review).
A. A. Murthy, S. M. Ribet, T. K. Stanev, P. Liu, T. Taniguchi, N. P. Stern, R. Dos Reis, V. P. Dravid, “Spatial Mapping of Electrostatic Fields in 2D Heterostructures,” Nano Lett., 21(17), 7131–7137, 2021.
K. He, K. Kim, C. J. Villa, S. M. Ribet, P. J. M. Smeets, R. dos Reis, P. W. Voorhees, X. Hu, V. P. Dravid, “Degeneration behavior of Cu nanowires under carbon dioxide environment: An in situ/operando study,” Nano Lett., 21(16), 6813–6819, 2021.
2020
V. Nandwana, S. M. Ribet, R. Dos Reis, Y. Kuang, Y. More, V. P. Dravid, “OHM Sponge: A Versatile, Efficient, and Ecofriendly Environmental Remediation Platform,” Ind. Eng. Chem. Res., 59(23), 10945–10954, 2020.
Patents¶
2025
S. M. Ribet, V. Nandwana, V. P. Dravid, “Magnetic Nanoparticle Coated Porous Membrane for Recovery of Contaminants,” U.S. Patent 12,390,790 B2, awarded August 19, 2025.
- Ribet, S. M., Danaie, M., de Kleijne, W. P. M., McCray, A. R. C., Allars, F., Allen, C. S., Ophus, C., & Varnavides, G. (2026). Real-space overlap is not enough: ambiguity in nanobeam iterative ptychography. arXiv. 10.48550/ARXIV.2608.30359
- Palos, M., Spillane, L., Topore, G., Li, Y., Pesquera, D., Ophus, C., Ribet, S. M., & Conroy, M. S. (2026). Programable Beam Control for Electron Energy-Loss Spectroscopy and Ptychography. Microscopy and Microanalysis, 32(4). 10.1093/mam/ozag080
- Wall, M. K., Pattison, A. J., Barnard, E. S., Ribet, S. M., & Ercius, P. (2026). TEM Agent: enhancing transmission electron microscopy with modern AI tools. Npj Computational Materials, 12(1). 10.1038/s41524-026-02103-z
- Lee, D., Oaks-Leaf, S., Ma, H., He, J., Wang, Z., Shi, Y., Ahn, E., Bustillo, K. C., Song, C., Ribet, S. M., Dhall, R., Ophus, C., Asta, M., Yang, J., Xia, Y., Limmer, D. T., & Zheng, H. (2026). Nanocrystal Geometry Governs Phase Transformation Pathways in Palladium Hydride. ACS Nano, 20(21), 15266–15278. 10.1021/acsnano.6c01302
- Neidhart, E. K., Ribet, S. M., Lee, T. A., Kearney, L., Bustillo, K. C., Dailing, E. A., Hua, M., Ophus, C., Fricke, S. N., Song, A.-Y., Reimer, J. A., Alexanian, E. J., Atkin, J. M., Helms, B. A., & Leibfarth, F. A. (2026). Polyolefin blends with co-continuous architectures enabled by dynamic covalent crosslinking. Science Advances, 12(20). 10.1126/sciadv.aee2328
- Kochetkova, T., Ribet, S. M., Vogl, L. M., Casari, D., Dhall, R., Zysset, P. K., Minor, A. M., & Schweizer, P. (2026). Structural and Mechanical Analysis of Individual Mineralized Collagen Fibrils Using In Situ Transmission Electron Microscopy. ACS Nano, 20(12), 10127–10137. 10.1021/acsnano.6c00964
- Bhusal, H. P., Tanaka, K., Zeltmann, S., Hanley, C., Ophus, C., Bustillo, K. C., Ribet, S. M., Gonzalez, C. A., Zhen, B., Ciston, J., Ge, Z., Lashley, J. C., Zettl, A. K., Velasco Jr, J., Chen, W., & Yan, A. (2026). Identifying Strain Stacking Boundaries between Multiphase Domains in Atomically Thin Two-Dimensional Magnets. ACS Nano, 20(11), 9079–9089. 10.1021/acsnano.5c14666
- Liu, Y., Li, Z., Sarkar, D., Ribet, S. M., Zhao, H., Xie, H., Yanda, P., Li, J., Dong, J., Yan, A., Shekhar, C., Yan, Q., Snyder, G. J., Grayson, M. A., Felser, C., dos Reis, R., Wolverton, C., Kanatzidis, M. G., & Dravid, V. P. (2026). Structural Heterogeneity in Medium-Entropy AgMnSbPbTe 4 for Glassy Thermal Transport and High Thermoelectric Performance. Journal of the American Chemical Society, 148(2), 2456–2470. 10.1021/jacs.5c17198
- Tillotson, E., Thornley, W., Talbott, W., Eggeman, A. S., Kriuchkova, D., Sullivan-Allsop, S., Smith, M., Liu, X., Slattery, A., Yap, P. L., Losic, D., Xu, Z., Wang, H., Ciston, J., Rakowski, A., Ribet, S. M., Savitzky, B. H., Schuster, M. E., Allen, C. S., … Haigh, S. J. (2026). A large interlaboratory electron diffraction study of monolayer graphene. 2D Materials, 13(2), 025007. 10.1088/2053-1583/ae2ca1
- Byrne, D. O., Ribet, S. M., Kepaptsoglou, D., Ramasse, Q. M., Ophus, C., & Allen, F. I. (2026). Fabrication and characterization of boron-terminated tetravacancies in monolayer hBN using STEM, EELS and electron ptychography. Ultramicroscopy, 282, 114305. 10.1016/j.ultramic.2025.114305
- McCray, A. R. C., Ribet, S. M., Varnavides, G., & Ophus, C. (2025). Deep generative priors for robust and efficient electron ptychography. arXiv. 10.48550/ARXIV.2511.07795
- Hoang, A. T., Neilson, K., Xu, K., Yang, Y., Ribet, S. M., Peña, T., D’Acunto, G., Song, Y. S., Persson, A. E. O., Millsaps, W., Ophus, C., Rosenberger, M. R., Pop, E., & Mannix, A. J. (2025). High-current p-type transistors from precursor-engineered synthetic monolayer WSe₂. arXiv. 10.48550/ARXIV.2509.07299
- Lee, J., Song, S. W., Cho, M. G., Varnavides, G., Ribet, S. M., Ophus, C., Scott, M. C., & Whittaker, M. L. (2025). PhaseT3M: 3D imaging at 1.6 Å resolution via electron cryo-tomography with nonlinear phase retrieval. Nature Communications, 17(1). 10.1038/s41467-025-67303-5
- Terzoudis-Lumsden, E. W. C., Sadri, A., Weyland, M., Bourgeois, L., Ribet, S. M., Varnavides, G., Ophus, C., Petersen, T. C., & Findlay, S. D. (2025). Quantitative Structure Determination from Experimental Four-Dimensional Scanning Transmission Electron Microscopy via the Scattering Matrix. Microscopy and Microanalysis, 31(6). 10.1093/mam/ozaf119