Email: alexey@nus.edu.sg
Current Research
Van der Waals (vdW) heterostructures have become one of the fastest growing research themes in modern condensed matter physics. Following the discovery of graphene, researchers have mastered the exfoliation of hundreds of layered materials up to the single atomic layer limit. These materials can be stacked together like Lego blocks (Nature 499, 419-425 (2013)) giving birth to the new artificial materials: vdW heterostructures. Their properties can be tuned by combining different materials, changing the number of layers, or adjusting the crystallographic alignment between different layers (twist angle). Recently, our group has made several breakthroughs in this field.
First, we have pioneered non-linear electron transport in twisted heterostructures (A. I. Berdyugin, et al, Science 375, 430-433 (2022)), which resulted in the discovery of a novel current propagation regime which is accompanied by the Schwinger particle-antiparticle production. Such non-linear electron transport is an essential property of semiconductors and is important for the functionality of many modern electronic devices. Currently, our group continues this line of research with a focus on other quantum vdW materials.
Another line of research is dedicated to unusual properties of Fermi liquid and Dirac (electron-hole) plasma, including quantum critical scattering, electron hydrodynamic (A. I. Berdyugin et. al., Science 364, 162-165 (2019)), and the giant magnetoresistance effect (N. Xin, … and A. I. Berdyugin, Nature 616, 270-274 (2023)) recently discovered in high-quality graphene heterostructures at elevated temperatures (>200K). Such research direction presents clear parallels with magnetoresistance transport in strange metals and Weyl semimetals and offers interesting opportunities to explore unusual physics in quantum-critical 2D systems. Our group will continue to study such quantum effects close to room temperature, thanks to unique opportunities brought by VdW heterostructures .
Selected Publications
- Giant magnetoresistance of Dirac plasma in high-mobility graphene. Na Xin, J. Lourembam, P. Kumaravadivel, A. E. Kazantsev, Zefei Wu, Ciaran Mullan, Julien Barrier, A. A. Geim, I. V. Grigorieva, A. Mishchenko, A. Principi, V. I. Fal’ko, L. A. Ponomarenko, A. K. Geim & Alexey I. Berdyugin, Nature, 616, 270-274 (2023)
- Out-of-equilibrium criticalities in graphene superlattices, A. I. Berdyugin, Na Xin, Haoyang Gao, Sergey Slizovskiy, Zhiyu Dong, Shubhadeep Bhattacharjee, P. Kumaravadivel, Shuigang Xu, L. A. Ponomarenko, Matthew Holwill, D. A. Bandurin, Minsoo Kim, Yang Cao, M. T. Greenaway, K. S. Novoselov, I. V. Grigorieva, K. Watanabe, T. Taniguchi, V. I. Fal’ko, L. S. Levitov, R. Krishan Kumar, A. K. Geim, Science 375, 430-433 (2022)
- Measuring Hall viscosity in graphene’s electron fluid, A. I. Berdyugin, S. G. Xu, F. M. D. Pelegrino, R. Krishan Kumar, A. Principi, I. Torre, M. Ben Shalom, T. Taniguchi, K. Watanabe, I. V. Grigorieva, M. Polini, A. K. Geim, D. A. Bandurin, Science 364, 162–165 (2019)
- Minibands in twisted bilayer graphene probed by magnetic focusing, A. I. Berdyugin, B. Tsim, P. Kumaravadivel, S. G. Xu, A. Ceferino, A. Knothe, R. Krishna Kumar, T. Taniguchi, K. Watanabe, A. K. Geim, I. V. Grigorieva, V. I. Fal’ko, Science Advances, 6, eaay7838 (2020)
- Long-range ballistic transport of Brown-Zak fermions in graphen superlattices, Julien Barrier, Piranavan Kumaravadivel, R. Krishna Kumar, L. A. Ponomarenko, Na Xin, Matthew Holwill, Ciaran Mullan, Minsoo Kim, R. V. Gorbachev, M. D. Tompson, J. R. Prance, T. Taniguchi, K. Watanabe, I. V. Grigorieva, K. S. Novoselov, A. Mishchenko, V. I. Fal’ko, A. K. Geim, A. I. Berdyugin, Nature Communications, 11, 5756 (2020). 2020 Top 50 Physics Articles in Nature Communication.
- Giant oscillations in a triangular network of one-dimensional states in marginally twisted graphene, S. G. Xu*, A. I. Berdyugin*, P. Kumaravadivel, F. Guinea, R. Krishna Kumar, D. A. Bandurin, S. V. Morozov, W. Kuang, S. Liu, J. H. Edgar, I. V. Grigorieva, V. I. Fal’ko, M. Kim, A. K. Geim, Nature Communications 10, 4008 (2019) Editors’ Highlight
Affiliations & Links
- Presidential Young Professor (PYP)
- Assistant Professor at MSE NUS
- Research Group