Contact

  • Academic
    psarkar2@stanford.edu
    University - Student Department: Materials Science and Engineering Position: Graduate
    University - Student Department: Materials Science and Engineering Position: Graduate

Additional Info

All Publications

  • Atomic-Scale Moiré and Electronic Structure Analysis of Twisted Epitaxial MoS2-Au-MoS2 Heterostructures. Nano letters Cui, Y., Xu, K., Ren, P., Yuan, L., Czaja, P., Barnum, A., Sarkar, P., Altman, A., Bustillo, K., Kundu, S., Ramdas, A., Wang, X., Wan, G., Wang, Y., Wang, J., Song, C., Lim, C., Zheng, Q., Yao, H., Heinz, T., Hwang, H. Y., Majumdar, A., Dionne, J. A., Ophus, C., da Jornada, F. H., Sinclair, R., Cui, Y. 2026

    Abstract

    Twisted epitaxy enables precise orientation control of nanostructures confined within van der Waals (vdW) gaps. Here, we investigate the moiré and electronic structure of a representative twisted epitaxial system, where Au nanodiscs are grown inside twisted bilayer MoS2 with a 6° interlayer twist, inducing a 3° symmetrical misalignment of Au relative to each MoS2 layer (MoS2-Au-MoS2). Using multislice electron ptychography (MEP), we resolve the three-dimensional "moiré-of-moirés" structure of MoS2-Au-MoS2 with atomic resolution. Electron energy loss spectroscopy (EELS) shows that MoS2 encapsulation significantly reduces the plasmon energy of Au nanodiscs compared with their unencapsulated counterparts. Furthermore, first-principles calculations reveal that Au insertion alters the electronic band alignment near the Fermi level of bilayer MoS2. Our results introduce a twisted MoS2-Au-MoS2 heterostructure as a structurally and electronically rich material system and establish twisted epitaxy as a new strategy for moiré engineering and the synthesis of 2D-confined materials with tunable optoelectronic properties.

    View details for DOI 10.1021/acs.nanolett.5c04205

    View details for PubMedID 41705938

  • TEM-STEM Studies of Twisted Epitaxial Ag Nanodisks Encapsulated Between Misoriented MoS2 Bilayers Microscopy and Microanalysis Czaja, P., Cui, Y., Sarkar, P., Cui, Y., Sinclair, R. 2025; 31 (Supplement)

    View details for DOI 10.1093/mam/ozaf048.633

  • Synthesis of Au/Si hybrid nanostructures with tuned optical properties via ultra-short laser pulses for in-Situ nanostructures generation (ULPING) OPTICAL MATERIALS Jamwal, N., Sarkar, P., Kiani, A. 2023; 142

    View details for DOI 10.1016/j.optmat.2023.114095

    View details for Web of Science ID 001031932900001

https://orcid.org/0000-0002-6046-2843