# Postdoctoral Fellows ## expand\_more [### Chiara Cignarella ](/people/chiara-cignarella) Chiara investigates low-dimensional materials using density-functional-theory and machine-learned force fields, with a particular focus on vibrational properties. Her work at Harvard focuses on the corrugation of twisted bilayer graphene using machine... ![Chiara Cignarella](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/2026-06/Chiara.jpeg?h=35f6776a&itok=rh9BeT3h) [### Daniel T. Larson ](/people/daniel-t-larson) Research Scientist Daniel uses density functional theory and molecular dynamics simulations to support experimental studies of novel materials, particularly twisted moiré systems. Recent work has focused on first-principles studies of atomic and electronic properties of... ![D Larson](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/daniel.png?itok=Xcl84Cnk) [### Varun Shreyas ](/people/varun-shreyas) Short bio. person ## Alumni [### Mattia Angeli ](/people/mattia-angeli) [mangeli(at)g(dot)harvard(dot)edu](mailto:mangeli(at)g(dot)harvard(dot)edu)Postdoctoral Fellow Mattia's research is centered around the numerical simulation of complex systems using mathematical modeling, first-principle methods and machine learning algorithms. His recent research interests encompass the development and implementation of methods to... ![Mattia Angeli](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/mattia.jpg?itok=G8pdfvqF) [### Raagya Arora ](/people/raagya-arora)Postdoctoral Fellow The work in my PhD dissertation focussed on chalcogenide-based thermoelectric and topologically nontrivial materials . I studied materials with non-trivial electronic topology using first-principles calculations based on density functional theory (DFT)... ![Raagya Arora](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/raagya.jpg?itok=hlxQYyVl) [### Danny Bennett ](/people/danny-bennett) Postdoctoral Fellow Danny is interested in the electromechanical properties of two-dimensional materials. Specfically, he is interested in ferroelectricity, the switching of electric fields in a material, which are used in transistors and memory applications. He is also... ![Photo of Danny Bennett](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/dbennett.jpg?itok=N-NSST53) [### Vasily Bulatov ](/vasily-bulatov) Current Affiliation: Lawrence Livermore National Laboratory Senior Scientist ![bulatov-vasily.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/bulatov-vasily.jpg?itok=LvdOjJ8t) [### Anderson Silva Chaves ](/people/anderson-silva-chaves)Postdoctoral Fellow Anderson works on materials modeling from first-principles calculations. His recent research interest encompass development and implementation of methods for electron-boson interactions from first-principles. He developed the dual interpolation method... ![Anderson Chaves](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/anderson.jpg?itok=BBeY2Zvs) [### Wei Chen ](/wei-chen) [weichen(at)g.harvard.edu](mailto:weichen(at)g.harvard.edu)Postdoctoral Fellow Wei works on materials modeling of 2D structures and heterogeneous catalysis. His recent interests are alloy catalysts and pre-exponential factor estimation. ![wei_chen_web_1_1.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/wei_chen_web_1_1.jpg?itok=LH9zwFSF) [### Kyeongjae Cho ](/kyeongjae-cho) [kjcho\[at\]utdallas.edu](mailto:kjcho[at]utdallas.edu) Current Affiliation: University of Texas, Dallas Professor, Materials Science Owner, Nanostellar Inc ![cho-kj-web.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/cho-kj-web_1.jpg?itok=yZpjaN7F) [### Marcus Elstner ](/marcus-elstner) Current Affiliation: University of Karlsruhe Professor, Department of Theoretical Chemical Biology. ![marcus_elstner.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/marcus_elstner.jpg?itok=y8vUbPPU) [### Ioanna Fampiou ](/people/ioanna-fampiou) [fampiou\[at\]fas.harvard.edu](mailto:fampiou[at]fas.harvard.edu) Ioanna is an instructor at Villanova University. She was a post-doctoral fellow at Harvard University under the direction of Prof. Efthimios Kaxiras. She joined the group in 2016. She received her PhD in Mechanical Engineering in 2014 from University of... ![Ioanna Fampiou](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/ioanna_fampiou.jpg?itok=1nDT1EUB) [### Maria Fyta ](/maria-fyta) Current Affiliation: University of Stuttgart Junior Professor Institute for Computational Physics [http://www.icp.uni-stuttgart.de/~icp/Main\_Page](http://www.icp.uni-stuttgart.de/~icp/Main_Page) ![maria-fyta.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/maria-fyta.jpg?itok=Fib5Vk9p) [### Oscar Granas ](/Oscar-granas) Current affiliation Current position: Senior Researcher, Docent Oscar's research interest is primarily the dynamics of electronic and magnetic excitations in solids and nano systems. He develops time-dependent den sity functional theory and extensions... ![oscar_granas_2.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/oscar_granas_2.jpg?itok=c6WJSmhj) [### Dennis Huang ](/people/dennis-huang)Ph.D 2016 ![dennis_huang.jpg](/sites/g/files/omnuum11321/files/styles/hwp_4_5__690x865/public/efthimios_kaxiras/files/dennis_huang.jpg?itok=65JOW1p1) Show morerefresh