Valovi gustoće naboja nekad i danas

master's thesis

• Title (english): Charge density waves in the past and nowadays
• Author: Miha Španić
• Mentor: Danko Radić (mentor)
• Committee member: Danko Radić (predsjednik povjerenstva)
• Committee member: Ivan Kupčić (član povjerenstva)
• Committee member: Maja Planinić (član povjerenstva)
• Committee member: Zoran Rukelj (član povjerenstva)
• Committee member: Karolina Matejak Cvenić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Physics); Zagreb
• Defense date and country: 2024-07-09, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract

U ovom diplomskom radu proučavao sam povijesni pregled područja fizike valova gustoće naboja. Od prvog predvidanja R. Peierlsa još tridesetih godina prošlog stoljeća, preko prvih eksperimentalnih dokaza u visokoanizotropnim materijalima tzv. kvazi-1D metalnim sustavima pa do danas aktualnih opažanja valova gustoće naboja, katkad nazivanim i “nabojnim prugama,” u visokotemperaturno supravodljivim kupratima (npr. LSCO, YBCO, CaC6) i dihalkogenidima prijelaznih metala (npr. TiSe2). Takoder sam proučio teorijske modele koji objašnjavaju fenomen. Od prvog teorijskog modela Peierlsove nestabilnosti za 1D metalne sustave, preko modela ugnje ždenja visoko anizotropne Fermijeve plohe za realne kvazi-1D sustave, pa do niza predloženih modela u pokušaju razumijevanja slojastih kvazi-2D sustava, s približno izotropnom Fermijevom plohom, koji potpuno odstupaju od modela temeljenog na njihovom ugnježdenju i koje do danas ne razumijemo u potpunosti.

Abstract (english)

In this thesis, I studied the historical overview of charge density waves field of physics. From R. Peierls’ first prediction of the phenomenon back in the thirties of the last century, through the first experimental evidence in so-called quasi-1D metal systems highly anisotropic materials to the current observations of charge density waves, sometimes referred to as “charge stripes,” in high-temperature superconducting cuprates (e.g. LSCO, YBCO, CaC6) and transition metal dichalcogenides (e.g. TiSe2). I also studied theoretical models that explain the phenomenon. From Peierls’first theoretical model of instability for 1D metal systems, through the nesting model of the highly anisotropic Fermi surface for real quasi-1D systems, to a series of proposed models attempting to understand layered quasi-2D systems with an approximately isotropic Fermi surface, which deviate entirely from the model based on their nesting and are still not fully understood to this day.

• Keywords: val gustoće naboja (CDW); nabojne pruge; nabojno uređenje; ugnježđenje Fermijeve plohe; elektron-fonon vezanje
• Keywords (english): charge density waves (CDW); charge stripes; charge ordering; Fermi surface nesting; electron-phonon coupling
• Language: croatian
• URN:NBN: urn:nbn:hr:217:196524
• Study programme: Title: The University Integrated Undergraduate and Graduate Programme in Physics Education; specializations in: Physics Education; Course: Physics Education; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: sveučilišni magistar edukacije fizike (sveučilišni magistar edukacije fizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-26 10:27:11