Siddharth Maddali

Computational physicist with a specialization in X-ray and optical imaging and microscopy for condensed matter and materials systems.

Fremont, California, United States of America

Research Expertise

Computational microscopy
Fourier/physical optics
signal processing
physics
HPC
Electrical and Electronic Engineering
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Biochemistry
Atomic and Molecular Physics, and Optics
Instrumentation
Radiation
Nuclear and High Energy Physics
Computational Mathematics
Mechanics of Materials
Inorganic Chemistry
Modeling and Simulation
Computer Science Applications
Metals and Alloys
Ceramics and Composites
Polymers and Plastics
Mechanical Engineering

About

Computational materials, imaging and microscopy scientist with **8 years combined experience** in industry and national laboratories. Expert in physics-based imaging and characterization with X-rays and optical probes, high-performance computing for light-matter interaction and materials data analysis. Experienced in machine learning for materials discovery. Previous experience at the National Energy Technology Laboratory, Argonne National Laboratory and KLA Corporation. <br>

Publications

Using automatic differentiation as a general framework for ptychographic reconstruction

Optics Express / Jun 19, 2019

Kandel, S., Maddali, S., Allain, M., Hruszkewycz, S. O., Jacobsen, C., & Nashed, Y. S. G. (2019). Using automatic differentiation as a general framework for ptychographic reconstruction. Optics Express, 27(13), 18653. https://doi.org/10.1364/oe.27.018653

Comparison between diffraction contrast tomography and high-energy diffraction microscopy on a slightly deformed aluminium alloy

IUCrJ / Jan 01, 2016

Renversade, L., Quey, R., Ludwig, W., Menasche, D., Maddali, S., Suter, R. M., & Borbély, A. (2016). Comparison between diffraction contrast tomography and high-energy diffraction microscopy on a slightly deformed aluminium alloy. IUCrJ, 3(1), 32–42. https://doi.org/10.1107/s2052252515019995

Strain Mapping of CdTe Grains in Photovoltaic Devices

IEEE Journal of Photovoltaics / Nov 01, 2019

Calvo-Almazan, I., Huang, X., Yan, H., Nazaretski, E., Chu, Y. S., Hruszkewycz, S. O., Stuckelberger, M. E., Ulvestad, A. P., Colegrove, E., Ablekim, T., Holt, M. V., Hill, M. O., Maddali, S., Lauhon, L. J., & Bertoni, M. I. (2019). Strain Mapping of CdTe Grains in Photovoltaic Devices. IEEE Journal of Photovoltaics, 9(6), 1790–1799. https://doi.org/10.1109/jphotov.2019.2942487

Multimodal X-ray imaging of grain-level properties and performance in a polycrystalline solar cell

Journal of Synchrotron Radiation / May 14, 2019

Ulvestad, A., Hruszkewycz, S. O., Holt, M. V., Hill, M. O., Calvo-Almazán, I., Maddali, S., Huang, X., Yan, H., Nazaretski, E., Chu, Y. S., Lauhon, L. J., Rodkey, N., Bertoni, M. I., & Stuckelberger, M. E. (2019). Multimodal X-ray imaging of grain-level properties and performance in a polycrystalline solar cell. Journal of Synchrotron Radiation, 26(4), 1316–1321. https://doi.org/10.1107/s1600577519003606

Strain annealing of SiC nanoparticles revealed through Bragg coherent diffraction imaging for quantum technologies

Physical Review Materials / Aug 02, 2018

Hruszkewycz, S. O., Maddali, S., Anderson, C. P., Cha, W., Miao, K. C., Highland, M. J., Ulvestad, A., Awschalom, D. D., & Heremans, F. J. (2018). Strain annealing of SiC nanoparticles revealed through Bragg coherent diffraction imaging for quantum technologies. Physical Review Materials, 2(8). https://doi.org/10.1103/physrevmaterials.2.086001

Phase retrieval for Bragg coherent diffraction imaging at high x-ray energies

Physical Review A / May 23, 2019

Maddali, S., Allain, M., Cha, W., Harder, R., Park, J.-S., Kenesei, P., Almer, J., Nashed, Y., & Hruszkewycz, S. O. (2019). Phase retrieval for Bragg coherent diffraction imaging at high x-ray energies. Physical Review A, 99(5). https://doi.org/10.1103/physreva.99.053838

General approaches for shear-correcting coordinate transformations in Bragg coherent diffraction imaging. Part II

Journal of Applied Crystallography / Mar 06, 2020

Li, P., Maddali, S., Pateras, A., Calvo-Almazan, I., Hruszkewycz, S. O., Cha, W., Chamard, V., & Allain, M. (2020). General approaches for shear-correcting coordinate transformations in Bragg coherent diffraction imaging. Part II. Journal of Applied Crystallography, 53(2), 404–418. https://doi.org/10.1107/s1600576720001375

General approaches for shear-correcting coordinate transformations in Bragg coherent diffraction imaging. Part I

Journal of Applied Crystallography / Mar 06, 2020

Maddali, S., Li, P., Pateras, A., Timbie, D., Delegan, N., Crook, A. L., Lee, H., Calvo-Almazan, I., Sheyfer, D., Cha, W., Heremans, F. J., Awschalom, D. D., Chamard, V., Allain, M., & Hruszkewycz, S. O. (2020). General approaches for shear-correcting coordinate transformations in Bragg coherent diffraction imaging. Part I. Journal of Applied Crystallography, 53(2), 393–403. https://doi.org/10.1107/s1600576720001363

Importance of outliers: A three-dimensional study of coarsening in α -phase iron

Physical Review Materials / Jun 27, 2019

Shen, Y.-F., Maddali, S., Menasche, D., Bhattacharya, A., Rohrer, G. S., & Suter, R. M. (2019). Importance of outliers: A three-dimensional study of coarsening in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> -phase iron. Physical Review Materials, 3(6). https://doi.org/10.1103/physrevmaterials.3.063611

High-Energy Coherent X-Ray Diffraction Microscopy of Polycrystal Grains: Steps Toward a Multiscale Approach

Physical Review Applied / Aug 27, 2020

Maddali, S., Park, J.-S., Sharma, H., Shastri, S., Kenesei, P., Almer, J., Harder, R., Highland, M. J., Nashed, Y., & Hruszkewycz, S. O. (2020). High-Energy Coherent X-Ray Diffraction Microscopy of Polycrystal Grains: Steps Toward a Multiscale Approach. Physical Review Applied, 14(2). https://doi.org/10.1103/physrevapplied.14.024085

Efficient ptychographic phase retrieval via a matrix-free Levenberg-Marquardt algorithm

Optics Express / Jul 07, 2021

Kandel, S., Maddali, S., Nashed, Y. S. G., Hruszkewycz, S. O., Jacobsen, C., & Allain, M. (2021). Efficient ptychographic phase retrieval via a matrix-free Levenberg-Marquardt algorithm. Optics Express, 29(15), 23019. https://doi.org/10.1364/oe.422768

9Cr steel visualization and predictive modeling

Computational Materials Science / Oct 01, 2019

Krishnamurthy, N., Maddali, S., Hawk, J. A., & Romanov, V. N. (2019). 9Cr steel visualization and predictive modeling. Computational Materials Science, 168, 268–279. https://doi.org/10.1016/j.commatsci.2019.03.015

Topology-faithful nonparametric estimation and tracking of bulk interface networks

Computational Materials Science / Dec 01, 2016

Maddali, S., Ta’asan, S., & Suter, R. M. (2016). Topology-faithful nonparametric estimation and tracking of bulk interface networks. Computational Materials Science, 125, 328–340. https://doi.org/10.1016/j.commatsci.2016.08.021

Experimental demonstration of coupled multi-peak Bragg coherent diffraction imaging with genetic algorithms

Physical Review B / Jun 01, 2021

Wilkin, M. J., Maddali, S., Hruszkewycz, S. O., Pateras, A., Sandberg, R. L., Harder, R., Cha, W., Suter, R. M., & Rollett, A. D. (2021). Experimental demonstration of coupled multi-peak Bragg coherent diffraction imaging with genetic algorithms. Physical Review B, 103(21). https://doi.org/10.1103/physrevb.103.214103

Nuclear chemistry research of high-energy nuclear reactions at Carnegie-Mellon University, 1961--1977. Summary report. [Summaries of research activities at Carnegie-Mellon University]

Nov 01, 1977

Caretto, A. A. Jr. (1977). Nuclear chemistry research of high-energy nuclear reactions at Carnegie-Mellon University, 1961--1977. Summary report. [Summaries of research activities at Carnegie-Mellon University]. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/5086119

3D Bragg Coherent Diffraction Imaging of Extended Nanowires: Defect Formation in Highly Strained InGaAs Quantum Wells

ACS Nano / Nov 15, 2022

Hill, M. O., Schmiedeke, P., Huang, C., Maddali, S., Hu, X., Hruszkewycz, S. O., Finley, J. J., Koblmüller, G., & Lauhon, L. J. (2022). 3D Bragg Coherent Diffraction Imaging of Extended Nanowires: Defect Formation in Highly Strained InGaAs Quantum Wells. ACS Nano, 16(12), 20281–20293. https://doi.org/10.1021/acsnano.2c06071

Grain boundary migration in polycrystalline α-Fe

Acta Materialia / Jan 01, 2024

Xu, Z., Shen, Y.-F., Naghibzadeh, S. K., Peng, X., Muralikrishnan, V., Maddali, S., Menasche, D., Krause, A. R., Dayal, K., Suter, R. M., & Rohrer, G. S. (2024). Grain boundary migration in polycrystalline α-Fe. Acta Materialia, 264, 119541. https://doi.org/10.1016/j.actamat.2023.119541

Sub-pixel high-resolution imaging of high-energy x-rays inspired by sub-wavelength optical imaging

Optics Express / Oct 11, 2021

Bertaux, N., Allain, M., Weizeorick, J., Park, J.-S., Kenesei, P., Shastri, S. D., Almer, J., Highland, M. J., Maddali, S., & Hruszkewycz, S. O. (2021). Sub-pixel high-resolution imaging of high-energy x-rays inspired by sub-wavelength optical imaging. Optics Express, 29(22), 35003. https://doi.org/10.1364/oe.438945

Enhancing the Use of Coals by Reburning-Sorbent Injection

Jan 31, 2001

(2001). Enhancing the Use of Coals by Reburning-Sorbent Injection. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/774068

Dark field X-ray microscopy below liquid-helium temperature: The case of NaMnO2

Materials Characterization / Oct 01, 2023

Plumb, J., Poudyal, I., Dally, R. L., Daly, S., Wilson, S. D., & Islam, Z. (2023). Dark field X-ray microscopy below liquid-helium temperature: The case of NaMnO2. Materials Characterization, 204, 113174. https://doi.org/10.1016/j.matchar.2023.113174

Time-resolved Dark-field X-ray Microscopy

Jul 07, 2022

Poudyal, I., Qiao, Z., Armstrong, M., & Islam, Z. (2022). Time-resolved Dark-field X-ray Microscopy. https://doi.org/10.26226/m.62a9d1ee9deaf4fdb6b3fde8

Laboratory Testing of the Boundary Layer Momentum Transfer Rotational Filter Systems, NETL-Innovatech, Inc., CRADA 98-F026, Final Report

Aug 22, 2000

(2000). Laboratory Testing of the Boundary Layer Momentum Transfer Rotational Filter Systems, NETL-Innovatech, Inc., CRADA 98-F026, Final Report. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/774788

Concurrent multi-peak Bragg coherent x-ray diffraction imaging of 3D nanocrystal lattice displacement via global optimization

npj Computational Materials / May 23, 2023

Maddali, S., Frazer, T. D., Delegan, N., Harmon, K. J., Sullivan, S. E., Allain, M., Cha, W., Dibos, A., Poudyal, I., Kandel, S., Nashed, Y. S. G., Heremans, F. J., You, H., Cao, Y., & Hruszkewycz, S. O. (2023). Concurrent multi-peak Bragg coherent x-ray diffraction imaging of 3D nanocrystal lattice displacement via global optimization. Npj Computational Materials, 9(1). https://doi.org/10.1038/s41524-023-01022-7

Detector Tilt Considerations in Bragg Coherent Diffraction Imaging: A Simulation Study

Crystals / Dec 17, 2020

Maddali, S., Allain, M., Li, P., Chamard, V., & Hruszkewycz, S. O. (2020). Detector Tilt Considerations in Bragg Coherent Diffraction Imaging: A Simulation Study. Crystals, 10(12), 1150. https://doi.org/10.3390/cryst10121150

The Effect of Intensity Fluctuations on Sequential X-ray Photon Correlation Spectroscopy at the X-ray Free Electron Laser Facilities

Crystals / Dec 04, 2020

Cao, Y., Sheyfer, D., Jiang, Z., Maddali, S., You, H., Wang, B.-X., Ye, Z.-G., Dufresne, E. M., Zhou, H., Stephenson, G. B., & Hruszkewycz, S. O. (2020). The Effect of Intensity Fluctuations on Sequential X-ray Photon Correlation Spectroscopy at the X-ray Free Electron Laser Facilities. Crystals, 10(12), 1109. https://doi.org/10.3390/cryst10121109

Impact and mitigation of angular uncertainties in Bragg coherent x-ray diffraction imaging

Scientific Reports / Apr 23, 2019

Calvo-Almazán, I., Allain, M., Maddali, S., Chamard, V., & Hruszkewycz, S. O. (2019). Impact and mitigation of angular uncertainties in Bragg coherent x-ray diffraction imaging. Scientific Reports, 9(1). https://doi.org/10.1038/s41598-019-42797-4

Sparse recovery of undersampled intensity patterns for coherent diffraction imaging at high X-ray energies

Scientific Reports / Mar 21, 2018

Maddali, S., Calvo-Almazan, I., Almer, J., Kenesei, P., Park, J.-S., Harder, R., Nashed, Y., & Hruszkewycz, S. O. (2018). Sparse recovery of undersampled intensity patterns for coherent diffraction imaging at high X-ray energies. Scientific Reports, 8(1). https://doi.org/10.1038/s41598-018-23040-y

Data Analytics for Alloy Qualification

Mar 20, 2018

Krishnamurthy, N., Maddali, S., Verma, A., Bruckman, L., Carter, J., French, R., Romanov, V., & Hawk, J. (2018). Data Analytics for Alloy Qualification. Office of Scientific and Technical Information (OSTI). https://doi.org/10.2172/1456238

In-situ synchrotron x-ray studies of the microstructure and stability of In2O3 epitaxial films

Applied Physics Letters / Oct 16, 2017

Highland, M. J., Hruszkewycz, S. O., Fong, D. D., Thompson, C., Fuoss, P. H., Calvo-Almazan, I., Maddali, S., Ulvestad, A., Nazaretski, E., Huang, X., Yan, H., Chu, Y. S., Zhou, H., Baldo, P. M., & Eastman, J. A. (2017). In-situ synchrotron x-ray studies of the microstructure and stability of In2O3 epitaxial films. Applied Physics Letters, 111(16). https://doi.org/10.1063/1.4997773

Education

Carnegie Mellon University

PhD, Physics / May, 2016

Pittsburgh, Pennsylvania, United States of America

Carnegie Mellon University

MS, Physics / May, 2011

Pittsburgh, Pennsylvania, United States of America

Indian Institute of Technology Madras

M.Sc, Physics / May, 2009

Chennai

Bangalore University

B.Sc, Physics, mathematics electronics / June, 2007

Bengaluru

Experience

KLA (United States)

Research Scientist / November, 2022Present

Sensitivity enhancement of optical inspection of semiconductor wafers

Argonne National Laboratory

Staff Scientist / October, 2019September, 2022

(1) Imaging: Inverse problems for 3D nanoscale materials imaging using coherent X-ray probes. (2) Time-resolved studies: Signal processing methods for XPCS at free electron laser facilities. (3) Experiments: POCs & demonstrations for the above at APS/future APS-U instruments. (4) Fundraising: Research grants (LDRD, DoE), APS, ESRF user-time proposals. (5) Dissemination/Outreach: Publications, peer review, editorship, conferences, tech reports. (6) Mentoring/Organization: Postdocs, students (unofficial), workshop planning/chairing.

Post-doctoral researcher / January, 2017September, 2019

National Energy Technology Laboratory

Postdoctoral Fellow / May, 2016November, 2016

Machine learning -driven materials discovery of steel alloys for optimized power plant components

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