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Preparation and Characterization of Van der Waals HeterostructuresCoy Diaz, Horacio 28 June 2016 (has links)
In this dissertation different van der Waals heterostructures such as graphene-MoS2 and MoTe2-MoS2 were prepared and characterized. In the first heterostructure, polycrystalline graphene was synthesized by chemical vapor deposition and transferred on top of MoS2 single crystal. In the second heterostructure, MoTe2 monolayers were deposited on MoS2 by molecular beam epitaxy.
Characterization of graphene-MoS2 heterostructures was conducted by spin and angle resolve spectroscopy which showed that the electronic structure of the bulk MoS2 and graphene in this van der Waals heterostructures is modified. For MoS2 underneath the graphene, a band structure renormalization and spin polarization are observed. The band structure of MoS2 is modified because the graphene induces screening which shifts the Г-point ~150 meV to lower binding compared to the sample without graphene. The spin polarization is explained by the dipole arising from band bending which breaks the symmetry at the MoS2 surface. For graphene, the band structure at lower binding energy shows that the Dirac cone remains intact with no significant doping. Instead, away from the Fermi level the formation of several gaps in the pi-band due to hybridization with states from the MoS2 is observed.
For the heterostructures made depositing monolayer of MoTe2 on MoS2, the morphology, structure and electronic structure were studied. Two dimensional growth is observed under tellurium rich growth conditions and a substrate temperature of 200 °C but formation of a complete monolayer was not achieved. The obtained MoTe2 monolayer shows a high density of the mirror-twins grain boundaries arranged in a pseudo periodic wagon wheel pattern with a periodicity of ~2.6 nm. These grain boundary are formed due to Te-deficiency during the growth. The defect states from these domain boundary pin the Fermi level in MoTe2 and thus determine the band alignment in the MoTe2-MoS2 heterostructures.
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"Till man och kvinna skapade han dem" : Relationen mellan kvinnan och mannen i Första Mosebok, Första Korintierbrevet samt Andra Klemensbrevet: En jämförelse utifrån feministisk och ideologisk teori.Rudolfsson, Camilla January 2024 (has links)
The purpose of this paper is to investigate and compare how the relationship between woman and man is expressed in Genesis, First Corinthians and Second Clement based on a feminist and ideological theory. This paper argues that the relationship between woman and man in all three texts (Gen, 1 Cor and 2 Clem) is equal. It is described that both Eve/woman and Adam/man are created by God, they must unite and become one, and they are in a mutual dependence on each other and God. Through a feminist and ideological theory, the creation story can contribute to understanding 1 Cor in a way where the woman is equal to the man. When the three texts are presented next to each other (heading 2.1.8), their similarities emerge clearly, and both 1 Cor and 2 Clem have eschatological undertones and explain above all that the female and the male belong together. My interpretation is that both 1 Cor and 2 Clem wants to correct incorrect hierarchies that arose in their contemporaries based on using the non-hierarchical order of the creation story to highlight how the relationship between women and men is actually intended. Interpreting the creation of Eve based on Adam's need for her means that Eve and thus the woman is Adam's equal helper. There is nothing in the text to suggest that women should be seen as subordinate to men. The point of the whole pericope is that Eve (created from Adam's bones and flesh) and Adam through marriage and sexual union will become one. What Paul expresses in 1 Cor 11:11-12 appears to be an explanation for the theological meaning of the verses of the creation story. "For just as the woman is from the man, so also the man through the woman and all are from God." Although Eve was created from man, Adam was the one who benefited from Eve's creation. He needed her both as a partner and companion and also as an enabler for humans to reproduce. Exactly how the verses in 2 Clem should be interpreted is unclear among the scholars presented in this paper. But on the other hand, the text expresses that the relationship between woman and man is, and should be, completely equal. The pericope explains how the Lord's kingdom will come when humans actively act according to the message of the text. There is no sign whatsoever of any kind of hierarchy between women and men.
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