Dissipative dynamics of spins in quantum dots

We present a theory for the dissipation of electronic spins trapped in quantum dots due to their coupling to the host lattice acoustic phonon modes. Based on the theory of dissipative two level systems for the spin dynamics, we derive a relation between the spin dissipative bath, the electron confinement, and the electron-phonon interaction. We find that there is an energy scale, typically smaller than the electronic lateral confinement energy, which sets the boundary between different dissipative regimes .Comment: 4 pages, 2 eps figure

HIGHAM, Nicholas ; RYAN, Martin. The Anglo-Saxon World. New Haven : Yale University Press, 2013.

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Alfred o Grande e a linhagem sagrada de Wessex : a construção de um mito de origem na Inglaterra anglo-saxônica

No final do século IX, as ações tomadas pelo rei Alfred, o Grande, foram decisivas para a sobrevivência da Inglaterra anglo-saxônica contra os vikings. Seu resgate cultural iria mudar a sociedade anglo-saxônica, reforçando as defesas do reino, a política e possibilitar a unificação da Inglaterra em meados do século X sob o governo do rei Athelstan. Entretanto, a razão principal para este resgate não era cultural, mas espiritual. Para esta tarefa, inspirado por obras como a Historia Ecclesiastica de Beda, um mito de origem foi forjado. Um mito que dizia que os anglo-saxões eram os herdeiros espirituais dos hebreus do Velho Testamento. E seus reis seriam descendentes de uma linhagem sagrada de um misterioso quarto filho de Noé. Neste artigo iremos analisar os elementos desse mito, como se deu sua construção e sua importância para o período alfrediano.In the end of 9th century, the actions taken by King Alfred the Great were decisive for the survival of the Anglo-Saxon England against the Vikings. His cultural revival would change the Anglo-Saxon society, reinforcing the defenses of the kingdom, the politics and enable the unification of England in the mid-10th century under king Athelstan's reign. However, the main reason behind this revival was not cultural but a spiritual. For this task, inspired by the works like Bede's Historia Ecclesiastica, a myth of origins was forged. A myth that said the Anglo-Saxons were the spiritual heirs of the Hebrews of Old Testament. And their kings would be descendent of a holy lineage of a mysterious forth son of Noah. In this article we will analyze the elements of this myth, how was its construction and its importance for the Alfredian period

Administrative and organizational capacities of civil society in EU Cohesion Policy

Administrative capacities are among the crucial factors influencing success in European Union (EU) Cohesion Policy absorption. The current research concentrates on the public sector, while administrative capacities in other stakeholders are omitted. Our research focuses on whether local stakeholders from civil society have sufficient capacities to contribute effectively and efficiently to EU Cohesion Policy implementation. We performed our research on 57 integrated urban development plans in Czechia and Portugal and conducted 33 interviews with local entities. The results indicate a different level of capacity not only between the public and civil society organizations but also within civil society.info:eu-repo/semantics/acceptedVersio

Condensation of Vortex-Strings: Effective Potential Contribution Through Dual Actions

Topological excitations are believed to play an important role in different areas of physics. For example, one case of topical interest is the use of dual models of quantum cromodynamics to understand properties of its vacuum and confinement through the condensation of magnetic monopoles and vortices. Other applications are related to the role of these topological excitations, nonhomogeneous solutions of the field equations, in phase transitions associated to spontaneous symmetry breaking in gauge theories, whose study is of importance in phase transitions in the early universe, for instance. Here we show a derivation of a model dual to the scalar Abelian Higgs model where its topological excitations, namely vortex-strings, become manifest and can be treated in a quantum field theory way. The derivation of the nontrivial contribution of these vacuum excitations to phase transitions and its analogy with superconductivity is then made possible and they are studied here.Comment: 7 pages. Based on a talk given by R. O. Ramos at the Infrared QCD in Rio conference, Rio de Janeiro, Brazil, June 5-9, 200