Related Experiment Video
Updated: Jun 27, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Stark Shift Reveals Stacking-Dependent Dipole Orientations of Excitons in ReS2
Shreya Paul1, Pritam Das1, Devarshi Chakrabarty1
1Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal 721302, India.
None:
The dipole moment and polarizability reveal important material properties of excitons in two-dimensional materials, which can be studied through the Stark shift. However, observing excitonic Stark shift requires a device design that enhances electric field coupling. Here, we demonstrate that a significant Stark shift in excitons can be observed in a back-gated field-effect transistor geometry with a specific layer stacking in rhenium disulfide (ReS2). Structural stacking provides exceptional control over the excitonic response in these few-layer devices. AB-stacked ReS2 shows the contribution of the linear and quadratic Stark shifts, approximately 13 meV, in the off-state of the transistor. In contrast, AA-stacked samples display negligible Stark shift, highlighting the stacking-dependent dipole moment of excitons in ReS2. Understanding the orientation of anisotropic excitons can be highly valuable for developing electronically tunable light-matter interactions and excitonic transport in optoelectronic devices.
Related Concept Videos
π Electron Effects on Chemical Shift: Overview
Resonance and Hybrid Structures
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
Inductive Effects on Chemical Shift: Overview
