PhD: \;Carmen Gómez Carbonell
\nD irector:
\nICREA Prof. Sergio O. Valenzuela\, \;Group L eader of the Physics and Engineering of Nanodevices \;group at Institut Català de Nanociència i Nanotecnologia (ICN2)
\nShort Abstract: \;Intrinsic magnetic topological insu lators combine band topology with magnetic order\, offering access to phen omena such as the quantum anomalous Hall effect (QAHE). This thesis invest igates the molecular beam epitaxy (MBE) growth and characterisation of MnB i₂Te₄ and MnSb₂Te₄ thin films\, with emphasis on a digital alloy ( DA) growth strategy. The DA approach enabled the synthesis of both compoun ds\, as well as members of the (MnBi₂Te₄)ₘ(Bi₂Te₃)ₙ homologous family\, including MnBi₄Te₇ and MnBi₆Te₁₀. Compared with co-eva poration\, DA growth improved Mn incorporation and stoichiometry control\, leading to higher-quality films. Structural\, transport and electronic ch aracterisation confirmed the magnetic and topological nature of the films. Analysis combining HAADF-STEM imaging and multislice simulations revealed an antisite defect mechanism in MnBi₂Te₄ and MnSb₂Te₄\, involving Bi(Sb) occupation of Mn sites and excess Mn incorporation at Bi(Sb) sites . These results provide insights into growth and defect formation mechanis ms and establish a basis for optimisation of magnetic topological material s.
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DTSTART:20261029T103000 DTEND:20261029T225959 LOCATION:ICN2 Seminar Room CATEGORIES:ICN2 Theses Defence END:VEVENT END:VCALENDAR