Related Experiment Video
Updated: Jan 15, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Temperature dependence of excitonic Hubbard U interaction in WS2/WSe2 moiré superlattices
Zihao Wang1,2, Haowen Xu2, Shihong Chen2
1School of Resources, Environment and Materials, Guangxi University, Guangxi, Nanning 530004, P.R. China. galaxy@gxu.edu.cn.
Abstract:
WS2/WSe2 moiré superlattices, formed with small twist angles, realize unique quantum phenomena such as the Hubbard effect due to periodic potential wells confining excitons. The Hubbard U interaction denotes the energy penalty for multiple excitons occupying a single well. However, most research focuses on low temperatures, neglecting thermal effects. Here, we systematically investigated temperature-dependent exciton dynamics using photoluminescence spectroscopy for precise structural and optical characterization. By controlling temperature (5-80 K), we observed a Hubbard U, with the IX2 peak red-shifting and vanishing at 78 K, indicating that temperature-induced thermal fluctuations disrupt exciton confinement and suppress the Hubbard effect. Our findings clarify the critical impact of temperature on exciton quantum states and inform the design of moiré superlattice-based quantum devices, thus advancing applications of two-dimensional materials in quantum technology.
Related Concept Videos
Atomic Spectroscopy: Effects of Temperature
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
Valence Bond Theory
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
According to Hooke's law, the vibrational frequency is directly proportional to...
UV–Vis Spectroscopy: Molecular Electronic Transitions
Van der Waals Interactions
Molecular Orbital Theory II

