Xin Lu

(presenting on September 24, 2025)

Probing the Excitonic and Phononic Properties of Two-Dimensional Layered Materials

Abstract

In this talk, I will introduce our recent experimental studies on the excitonic and phononic properties of two-dimensional (2D) layered materials by using our home-built Photoluminescence (PL) and Raman spectroscopies. To begin with, I will present our work on Raman spectroscopy of 2D MoS2 on Ti3C2 MXene, where we probed the substrate effect from Ti3C2 MXene by monitoring the fingerprint Raman peaks from MoS2.1 Followed by the undergraduate research work, I will show our temperature-dependent Raman spectroscopic study on the quasi-one-dimensional layered material, ZrS3.2 Different from MoS2, ZrS3 is highly anisotropic, which gives rise to distinct temperature-dependent features among the lattice vibrational modes. Finally, I will present our work on the excitonic properties from monolayer WSe2, which includes tuning the charged localized excitons by using a piezoelectric relaxor ferroelectric substrate3 and electric control of the out-of-plane orientated “dark exciton”4.
1. E. Pollack, Q. Zhou, E. Loni, K. Agbakansi, A. Majed, F. Wang, A. Soleymani, M. Busse, M. Naguib and X. Lu. Raman Spectroscopy of 2D MoS2 on Ti3C2 MXene: the Substrate Effect. Nanoscale Adv. 7, 3456, 2025.
2. Q. Zhou, F. Wang, A. Soleymani and X. Lu. Temperature-Dependent Raman Spectroscopy of Quasi-One-Dimensional ZrS3 Nanoflakes. J. Phys. Chem. C 129, 11468, 2025.
3. Q. Zhou, F. Wang, A. Soleymani, K. Watanabe, T. Taniguchi, J. Wei and X. Lu. Enhanced Polarizability and Tunable Diamagnetic Shifts from Charged Localized Emitters in WSe2 on a Relaxor Ferroelectric. Under Review.
4. A. Soleymani, Q. Zhou and X. Lu. In preparation.

Speaker Bio

Dr. Xin Lu obtained her bachelor’s degree in materials physics from Wuhan University in 2012, and her PhD in applied physics from Nanyang Technological University in 2017. Prior to joining Tulane as an Assistant Professor, Dr. Lu was a postdoc researcher in the department of physics at Emory University, where she worked on localized excitons and exciton-exciton interaction in 2D layered materials. Dr. Lu’s current group at Tulane focuses on the excitonic and phononic properties in 2D materials.