Van der Waals Heterostructures for New Quantum Materials

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Kartik_Ruhan_2025.pdf (6.87 MB)

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Perustieteiden korkeakoulu | Bachelor's thesis
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Date

2025-09-19

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Major/Subject

Quantum Technology

Mcode

SCI3103

Degree programme

Aalto Bachelor’s Programme in Science and Technology

Language

en

Pages

29

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Abstract

Two-dimensional (2D) thin film research is of growing interest and focus in the field of material physics. Transition metal dichalcogenides (TMDCs) are a group of 2D materials, with varying structural and electronical properties. TMDCs are of growing interest due to their diverse properties and microelectronic applications. This experiment studied two such TMDCs — WSe2 and TaSe2. The objective was to grow WSe2-TaSe2 heterostructures to study the intrinsic properties of TaSe2, which is a quantum spin liquid candidate. The TMDC thin films were grown through MBE in a UVH chamber, and their growth parameters optimised through SEM analysis of grown samples. Once SEM images showed promising triangular structures, WSe2 growth was verified through XPS. WSe2-TaSe2 heterostructures were subsequently grown and analysed through STM. The analysis found lateral and vertical heterostructure growth, and the phase of TaSe2 structures were characterised.

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Supervisor

Raasakka, Matti

Thesis advisor

Drost, Robert

Keywords

MBE, SEM, STM, TaSe2, van der Waals materials, WSe2

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https://urn.fi/URN:NBN:fi:aalto-202510218405

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[kand] Perustieteiden korkeakoulu / SCI