Spin-filtered edge states in graphene

Spin–orbit coupling changes graphene, in principle, into a two-dimensional topological insulator, also known as quantum spin Hall insulator. One of the expected consequences is the existence of spin-filtered edge states that carry dissipationless spin currents and undergo no backscattering in the presence of non-magnetic disorder, leading to quantization of conductance. Whereas, due to the small size of spin–orbit coupling in graphene, the experimental observation of these remarkable predictions is unlikely, the theoretical understanding of these spin-filtered states is shedding light on the electronic properties of edge states in other two-dimensional quantum spin Hall insulators. Here we review the effect of a variety of perturbations, like curvature, disorder, edge reconstruction, edge crystallographic orientation, and Coulomb interactions on the electronic properties of these spin filtered states.

Exponential decay of spin-spin correlation between distant defect states produced by contour hydrogenation of polycyclic aromatic hydrocarbon molecules

The first few low-lying spin states of alternant polycyclic aromatic hydrocarbon (PAH) molecules of several shapes showing defect states induced by contour hydrogenation have been studied both by ab initio methods and by a precise numerical solution of Pariser-Parr-Pople (PPP) interacting model. In accordance with Lieb's theorem, the ground state shows a spin multiplicity equal to one for balanced molecules, and it gets larger values for imbalanced molecules (that is, when the number of π electrons on both subsets is not equal). Furthermore, we find a systematic decrease of the singlet-triplet splitting as a function of the distance between defects, regardless of whether the ground state is singlet or triplet. For example, a splitting smaller than 0.001 eV is obtained for a medium size C46H28 PAH molecule (di-hydrogenated [11]phenacene) showing a singlet ground state. We conclude that π electrons unbound by lattice defects tend to remain localized and unpaired even when long-range Coulomb interaction is taken into account. Therefore they show a biradical character (polyradical character for more than two defects) and should be studied as two or more local doublets. The implications for electron transport are potentially important since these unpaired electrons can trap traveling electrons or simply flip their spin at a very small energy cost.

Transport across two interacting quantum dots: Bulk Kondo, Kondo box, and molecular regimes

We analyze the transport properties of a double quantum dot device with both dots coupled to perfect conducting leads and to a finite chain of N noninteracting sites connecting both of them. The interdot chain strongly influences the transport across the system and the local density of states of the dots. We study the case of a small number of sites, so that Kondo box effects are present, varying the coupling between the dots and the chain. For odd N and small coupling between the interdot chain and the dots, a state with two coexisting Kondo regimes develops: the bulk Kondo due to the quantum dots connected to leads and the one produced by the screening of the quantum dot spins by the spin in the finite chain at the Fermi level. As the coupling to the interdot chain increases, there is a crossover to a molecular Kondo effect, due to the screening of the molecule (formed by the finite chain and the quantum dots) spin by the leads. For even N the two Kondo temperatures regime does not develop and the physics is dominated by the usual competition between Kondo and antiferromagnetism between the quantum dots. We finally study how the transport properties are affected as N is increased. For the study we used exact multiconfigurational Lanczos calculations and finite-U slave-boson mean-field theory at T=0. The results obtained with both methods describe qualitatively and also quantitatively the same physics.

Contribution to Real-Time Estimation of Crop Phenological States in a Dynamical Framework Based on NDVI Time Series: Data Fusion With SAR and Temperature

In this study, a methodology based in a dynamical framework is proposed to incorporate additional sources of information to normalized difference vegetation index (NDVI) time series of agricultural observations for a phenological state estimation application. The proposed implementation is based on the particle filter (PF) scheme that is able to integrate multiple sources of data. Moreover, the dynamics-led design is able to conduct real-time (online) estimations, i.e., without requiring to wait until the end of the campaign. The evaluation of the algorithm is performed by estimating the phenological states over a set of rice fields in Seville (SW, Spain). A Landsat-5/7 NDVI series of images is complemented with two distinct sources of information: SAR images from the TerraSAR-X satellite and air temperature information from a ground-based station. An improvement in the overall estimation accuracy is obtained, especially when the time series of NDVI data is incomplete. Evaluations on the sensitivity to different development intervals and on the mitigation of discontinuities of the time series are also addressed in this work, demonstrating the benefits of this data fusion approach based on the dynamic systems.

The woman who toils: being the experiences of two gentlewomen as factory girls

by Mrs. John Van Vorst and Marie Van Vorst.

THE DARK PERSONALITY AND JOB SUCCESS IN THE UNITED STATES ARMY: USE OF INTERPERSONAL MANIPULATION IN THE WORKPLACE

This dissertation relates job desires and outcomes to the Dark Personality (Psychopathy, Machiavellianism, Narcissism, Low Agreeableness, Low Honesty-Humility) in the United States Army. It purports that individuals high on the Dark Personality desire more power, money, and status, and that they obtain jobs that afford them these luxuries by using manipulation at work. Two pilot studies used samples of United States Army members to create and test index variables: Dark Personality, Total Manipulation in the workplace, Desire for Job Success, and Total Job Success in the Army. Individual personality traits, manipulation tactics, and job desires were examined in secondary analyses. Using a sample of 468 United States Army Members, central analyses indicated that Army members high on the Dark Personality desired Job Success. Likewise, army members higher on the Dark Personality used more Manipulation tactics at work, including the egregious tactics. Yet, using more Manipulation tactics at work predicted lower levels of Job Success in the Army. Most manipulation tactics had a negative impact on Job Success, with the exception of soft tactics like Reason and Responsibility Invocation. Together, these results indicate that selective use of soft manipulation predicted Job Success, but use of more manipulation tactics predicted less Job Success in the Army. Curvilinear results indicated that being either very low or very high on the Dark Personality predicted more Job Success in the Army, whereas having intermediate levels of the Dark Personality predicted less Job Success. Finally, possessing the Dark Personality and using more Manipulation tactics at work, together, predicted less Job Success in the Army. Collectively, the results indicate that army members with intermediate levels of the Dark Personality want more powerful and high paying jobs, yet their strategy of manipulating their coworkers to move up the job ladder does not result in higher ranking, higher paying Army positions. However, Army members highest on the Dark Personality achieved job success, defying the maladaptive influence that antisocial personality traits and manipulative behaviour had on job success for most Army members. Therefore, this dissertation indicates that successful corporate scoundrels exist in the Army, but there are few of them.

Two decades on from the break-up of Czechoslovakia: Departures, diversions and destinations. CEPS Commentary, 7 March 2013

Twenty years after the split of Czechoslovakia, expert analysts from the Czech Republic, Slovakia and the UK shed light on the political geography of this part of Central Europe in an extended three-part Commentary. The end points in the Euro-Atlantic integration processes of the successor states may be similar, argue the authors, but the journeys have been very different. Recent experience would suggest that in terms of EU politics, the Slovaks will be rather passive whilst the Czechs might be a little more troublesome. On the domestic front, the political discourse and competition in both states will largely revolve around the question of competence and corruption.

The New EU Foreign Policy Architecture: Reviewing the first two years of the EEAS. CEPS Paperbacks. February 2013

This CEPS book examines two interrelated questions: 1) How has the European External Action Service (EEAS) functioned in the EU institutional architecture in the first two years of its existence? 2) What improvements can be made through the 2013 review and the 2014 revision of the EEAS’ mandate? The study contributes to the current debate through an in-depth examination of the EEAS’ relations with the EU member states, the European Commission, the European Parliament and its Delegations. The analysis is complemented by in-depth interviews conducted with senior officials from the relevant institutions. The authors put forward specific recommendations, organised around three basic roles that the EEAS plays in the EU’s external relations: a) leader, b) coordinator and c) information hub.

Labour Supply Curves for EU Member and Candidate States: An applied general equilibrium analysis. Factor Markets Working Paper No. 26, June 2012

This paper introduces a more sophisticated modelling of the labour market functioning of the European member and candidate states through the introduction of labour supply curves in an applied general equilibrium model. A labour supply curve offers a middle way in labour supply modelling, sitting between the two commonly adopted extremes of spare capacity and full employment. The first part of the paper outlines the theoretical foundation of the labour supply curve. Real world data is then used to derive labour supply curves for each member state, along with Croatia and Turkey. Finally, the impact of the newly specified labour markets on the results of an illustrative scenario involving reform of the common agricultural policy is explored. The results of computable general equilibrium analysis with the labour supply curve confirm the theoretical expectation that modelling the labour supply through an upwards-sloping curve produces results that lie between the extremes of spare capacity of the labour factor and fully employed labour. This specification captures a greater degree of heterogeneity in the labour markets of the member and candidate states, allowing for a more nuanced modelling of the effects of policy reform, including welfare effects.

The Impact of CAP Payments on the Exodus of Labour from Agriculture in Selected EU Member States. Factor Markets Working Document No. 66, August 2013

This paper examines the determinants of exit from agriculture under the implementation of CAP payments in four selected EU countries (France, Hungary, Italy and Poland) in the period 2005-08. The study employs micro-data from the European Union Labour Force Survey and regional data from the Farm Accountancy Data Network. We differentiate among the different measures of farm payments, looking at the individual impact of Pillar 1 instruments, i.e. coupled and decoupled payments, and at those in Pillar 2, targeted at rural development. The main results suggest that total subsidies at the regional level are negatively associated with the out-farm migration of agricultural workers in the two New member states, Hungary and Poland, so that the CAP would seem to hinder the exit of labour from agriculture. Conversely, the non-significant results for the ‘old’ member states may be interpreted as the result of opposing effects of coupled payments and rural development support. The diverse impact of CAP on the likelihood of leaving agriculture in the four countries reflects the heterogeneity across European member states, due to different market and production structures, which does not allow a common and simple generalisation of the effect of the CAP on labour allocation.

Does All Fit One Size? An evaluation of the ECB policy response to changing economic conditions in the Euro area member states. ACES Cases No. 2008.1

This paper empirically investigates the extent to which the European Central Bank has responded to evolving economic conditions in its member states as opposed to the euro area as a whole. Based on a forward-looking Taylor rule-type policy reaction function, we conduct counterfactual exercises that compare the monetary policy behavior of the ECB with two alternative hypothetical scenarios: (1) were the euro member states to make individual policy decisions, and (2) were the ECB to respond to the economic conditions of individual members. The results reflect the extent of heterogeneity among the national economies in the monetary union and indicate that the ECB's monetary policy rates have been particularly close to the "counterfactual" interest rates of its largest euro members, as well as of countries with similar economic conditions, which includes Germany, Austria, Belgium and France.

Is the EU’s Governance ‘Good’?: An assessment of EU governance in its partnership with ACP States. IES WORKING PAPER 1/2010

This paper examines both the processes and outcomes of governance in the context of the EU’s relationship with ACP States within the period of the Cotonou Agreement (CA). It discusses and assesses a variety of governance mechanisms, including the European Commission’s use of the governance concept, EPAs, manifestations of partner preferences, the EDF, the revision of the CA, and Fisheries Partnership Agreements. Specific examples of the wielding of each mechanism are assessed based upon two criteria: a) the extent to which the wielding of the mechanism by the EU is a manifestation of “good governance”, and b) the extent to which the EU’s wielding of the mechanism has resulted, or is likely to result, in the sustainable development of and reduction of poverty in ACP countries. The examples are chosen to illustrate contradictions between rhetoric and practice and the consequential negative (actual and potential) impact upon development in ACP States. The final section offers suggestions for improving the EU’s governance processes and their outcomes for development.

Progress on the “Juncker Plan” continues – but are Member States behind it? EPC Commentary, 18 March 2015

Introduction. The draft regulation on the Juncker Investment Plan was presented by the European Commission in January and has been discussed by the Ecofin Council on 10 March. This leaves sufficient time for the European Parliament to express its views and to make the Plan operational by the summer, as aimed for by President Juncker. But while governments agreed swiftly, ministers did not decide on two issues that are of importance: the eligibility of projects that have benefited from the Connecting Europe Facility (CEF) and the Horizon 2020 programmes and the contributions of the national promotional banks (NPBs) to the investment plan. This commentary argues that the foreseeable engagement of NPBs remains unsatisfactory.

Puerto Rico and Greece: A Tale of two defaults in a monetary union. CEPS High-Level Brief. 18 June 2015, Update 30 June 2015

It is widely argued that the problems of Greece in the eurozone derive not only from mistakes made by successive Greek governments, but from deep-seated problems with the design of the euro area. The euro area is judged to be incomplete because it does not have any fiscal shock absorbers, nor a federal transfer system, and, according to many, it has imposed senseless austerity on the country. The US, by contrast, is often held up as an example of a complete monetary union in this type of problem could not arise. However, the working of the US is much less perfect than it appears from afar. The ‘genuine’ economic and monetary union, which undoubtedly exists in the US, also has problems in dealing with low-performing states in terms of productivity and governance. Puerto Rico exemplifies these difficulties and shows that in such an integrated area similar problems, including a fiscal crisis can arise. Both Puerto Rico and Greece are very special and extreme cases within their respective unions, but the strength of a system can be measured by how it deals with these cases.

Solidarity and asylum seekers: member states agreed to disagree. EPC Commentary, 29 June 2015

At the June 2015 European Council, European leaders were meant to come to an agreement in order to help Italy and Greece cope with the increasing number of migrants and asylum seekers arriving on their shores. They were invited to give their agreement on a proposal from the European Commission to set up a mandatory relocation scheme, i.e. a scheme defining the precise number of asylum seekers that should be relocated to each member state over the next two years.