Regensburg 2025 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: 2D Semiconductors and van der Waals Heterostructures II

HL 8.4: Vortrag

Montag, 17. März 2025, 15:45–16:00, H15

Biaxial Compressive Strain Tuning of Quantum Properties in 2D Materials — •Eudomar Rafael Henriquez Guerra^1,3, Lisa Almonte^1,3, Hao Li⁴, Daniel Elvira³, Reyes Calvo^1,2,3, and Andres Castellanos Gomez⁴ — ¹BCMaterials, Basque Center for Materials, Applications and Nanostructures — ²Ikerbasque, Basque Foundation for Science — ³Depto. de Física Aplicada, Instituto Universitario de Materiales, Universidad de Alicante — ⁴2D Foundry Group, Instituto de Ciencia de Materiales de Madrid, CSIC

This study investigates the impact of biaxial compressive strain on 2D materials at cryogenic temperatures, focusing on single-layer transition metal dichalcogenides (TMDs) and multilayered NbSe2. While tensile strain has been widely explored, compressive strain at low temperatures remains underexplored, despite its potential to significantly alter quantum properties such as magnetic and superconducting phase transitions. We show that biaxial compressive strain, induced by the thermal expansion mismatch between the polymer substrates and TMDs, leads to dramatic shifts in exciton energy and gauge factors, surpassing previous compressive strain effects. Moreover, we observe a consistent reduction in the superconducting critical temperature of NbSe2 flakes, with the most pronounced changes in thinner samples. Remarkably, this effect is still noticeable even for NbSe2 flakes as thick as 86 nm. These results highlight a powerful and cost-effective method for tuning phase transitions and other quantum phenomena in 2D materials at low temperatures.

Keywords: 2D Materials; Transition Metal Dichalcogenides; Strain Engineering; Superconductivity; Phase Transition