CNRS-CRHEA | Publications

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⋄ In-situ engineering hexagonal boron nitride in van der Waals heterostructures with selective SF6 etching

Hitesh Agarwal, Antoine Reserbat-Plantey, David Barcons Ruiz, Karuppasamy Pandian Soundarapandian, Geng Li, Vahagn Mkhitaryan, Johann Osmond, Helena Lozano, Kenji Watanabe, Takashi Taniguchi, Petr Stepanov, Frank Koppens and Roshan Krishna Kumar
Choisir un journal..., 1, 2515, (2025)

⋄ Single-photon detection enabled by negative differential conductivity in moiré superlattices

K. Nowakowski, H. Agarwal, S. Slizovskiy, R. Smeyers, X. Wang, Z. Zheng, J. Barrier, D. Barcons Ruiz, G. Li, R. Bertini, M. Ceccanti, I. Torre, B. Jorissen, A. Reserbat-Plantey, K. Watanabe, T. Taniguchi, L. Covaci, M. V. Milošević, V. Fal’ko, P. Jarillo-Herrero, R. K. Kumar, F. H. L. Koppens
Science, 389, 6760, (2025)
Abstract online (HAL) : click here...

⋄ Terahertz photocurrent probe of quantum geometry and interactions in magic-angle twisted bilayer graphene

Roshan Krishna Kumar 1,2 , Geng Li 1,19, Riccardo Bertini 1,19, Swati Chaudhary3,4,19, Krystian Nowakowski 1, Jeong Min Park 4, Sebastian Castilla 1, Zhen Zhan 5, Pierre A. Pantaleón 5, Hitesh Agarwal 1, Sergi Batlle-Porro 1, Eike Icking6,7, Matteo Ceccanti1, Antoine Reserbat-Plantey1,8, Giulia Piccinini1, Julien Barrier 1, Ekaterina Khestanova1, Takashi Taniguchi 9, Kenji Watanabe 10, Christoph Stampfer 6,7, Gil Refael11, Francisco Guinea 5,12, Pablo Jarillo-Herrero 4, Justin C. W. Song 13, Petr Stepanov 1,14,15, Cyprian Lewandowski 11,16,17 & Frank H. L. Koppens 1,18
N. Mat. Nature Materials, , , (2025)
Abstract online (HAL) : click here...

⋄ Electrical characteristics and trap signatures for Schottky barrier diodes on 4H-SiC, GaN-on-GaN, AlGaN/GaN epitaxial substrates

Shikha Kumari, Rashmi Singh, Shivam Kumar, N V L Narasimha Murty, Dominique Planson, Christophe Raynaud, Camille Sonneville, Hervé Morel, Luong Viet Phung, Thi Huong Ngo, Philippe De Mierry, Eric Frayssinet, Yvon Cordier, Hassan Maher, Raphael Sommet, Jean-Christophe Nallatamby and P Vigneshwara Raja
Semicond. Sci. Tech., 39, 065016 , (2024)

⋄ Ultra-broadband photoconductivity in twisted graphene heterostructures with large responsivity

H. Agarwal, K. Nowakowski, A. Forrer, A. Principi, R. Bertini, S. Batlle-Porro, A. Reserbat-Plantey, P. Prasad, L. Vistoli, K. Watanabe, T. Taniguchi, A. Bachtold, G. Scalari, R. Krishna Kumar, F. H. L. Koppens
Nat. Photonics, 17, 1047, (2023)
Abstract online (HAL) : click here...

⋄ Luminescence behavior of semipolar (10-11) InGaN/GaN “bow-tie” structures on patterned Si substrates