Syftet med denna avhandling är att bidra till forskningen av befintliga TMD:er (på Engelska transition metal dichalcogenide-TMD) som visar laddningstäthetsvågor och supraledning vid låga temperaturer (som 2H-TaS2). 2H-TaS2 är också känt för att visa supraledning vid 2K. Dessutom kommer en betydande del av denna avhandling att ägnas åt analysen av den elektronstrukturen nära Ferminivån av Cu-interkalerad TiSe2 och speciellt dess laddningstäthets-beteende vid temperaturer under 200K. Medan de teoretiska modellerna överlåts till teoretikerna, är följande sidor tillägnad att ge ett kvalitativt perspektiv på materialen. Avhandlingen är uppdelad i fyra huvudavsnitt: grundläggande begrepp, experiment-ella tekniker, tidigare rön och dataanalys. Det första avsnittet syftar till att introducera de viktigaste relevanta begreppen för att spåra de många möjliga fenomen som händer i bulk-TMD, speciellt Fe-dopade TaS2 i 2H-fasen och Cu-interkalerade TiSe2 i 1T fas. Elektronisk dispersion i fasta ämnen kommer att diskuteras på ett inledande och fenomenologiskt sätt utan rigorösa härledningar och ska hjälpa läsaren att förstå kapitlen därefter. / Motivation: The family of transition metal dichalcogenides (TMDs) has captured the fascination of researchers worldwide due to their remarkable properties and vast potential for various applications. These 2D materials exhibit a wide range of electronic, optical, and mechanical characteristics, making them incredibly versatile. From semiconductors to superconductors, TMDs offer a rich playground for exploration in condensed matter physics and materials science. Their unique properties are paving the way for breakthroughs in electronics, optoelectronics, energy storage, and beyond. As we delve deeper into the world of TMDs, we uncover new opportunities to revolutionize technology and enhance our understanding of the fundamental principles governing the behavior of matter. Joining the journey of discovery within the TMD family promises exciting challenges and the potential to contribute to the forefront of scientific and technological advancement. The aim of this thesis is to add to the canon of existing TMDs that display charge density waves and superconductivity at low temperatures (like 2H-TaS2). 2H-TaS2 is also known to display superconductivity at 2K. Additionally, a substantial part of this thesis will be dedicated to the analysis of the electronic structure near the Fermi level of Cu-intercalated TiSe2 and especially its charge-density behaviour at temperatures below 200K. While the theoretical models are left to the theoreticians, the following pages are dedicated to giving a qualitative perspective on the materials. Thesis Outline: The primary goal of this thesis is to provide an introduction to both widely utilized and cutting-edge experimental setups employed by physicists worldwide. This will enable the acquisition of practical experience, facilitating the mastery of best practices and analysis techniques within the realm of experimental condensed matter physics. The thesis is split into four main sections: fundamental concepts, experimental techniques, previous findings and data analysis. The first section is occupied to introduce the main relevant concepts to trace the many possible phenomena happening in bulk TMDs, specifically Fe-doped TaS2 in the 2H phase and Cu-intercalated TiSe2 in the 1T phase. Subjects such as electronic dispersion in solids will be discussed in a rather introductory and phenomenological manner without rigorous derivations and shall aid the reader in understanding the chapters thereafter.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-517043 |
| Date | January 2023 |
| Creators | Gruber, Christian Stefan |
| Publisher | Uppsala universitet, Institutionen för fysik och astronomi |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | FYSAST |
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