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See detailLa transplantation de la société par actions simplifiée (SAS) dans le droit des sociétés luxembourgeois
Prüm, André UL

in Mélanges en l'honneur de Jean-Jacques Daigre (2017)

Detailed reference viewed: 135 (4 UL)
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See detailTransport and Logistics in City Regions: Driving Forces for Counterurbanization? Investigations on the Postmodern Urban Landscape
Hesse, Markus UL

in Black, William; Nijkamp, Peter (Eds.) Social Change and Sustainable Transport (2002)

Detailed reference viewed: 36 (0 UL)
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See detailTransport and thermodynamics in driven quantum systems
Haughian, Patrick UL

Doctoral thesis (2018)

This thesis studies the nonequilibrium properties of quantum dots with regard to electrical conduction as well as thermodynamics. The work documented here shows how these properties behave under the ... [more ▼]

This thesis studies the nonequilibrium properties of quantum dots with regard to electrical conduction as well as thermodynamics. The work documented here shows how these properties behave under the influence of time-dependent drive protocols, pursuing two main lines of inquiry. The first concerns the interplay between nanomechanics and drive: In nanomechanical systems with strong coupling between the charge and vibrational sectors, conductance is strongly suppressed, an effect known as Franck-Condon blockade. Using a model Hamiltonian for a molecular quantum dot coupled to a pair of leads, it is shown here that this blockade can be exponentially lifted by resonantly driving the dot. Moreover, a multi-drive protocol is proposed for such a system to facilitate charge pumping that enjoys the same exponential amplification. The second line of inquiry moves beyond charge transport, examining the thermodynamics of a driven quantum dot coupled to a lead. Taking a Green's function approach, it is found that the laws of thermodynamics can be formulated for arbitrary dot-lead coupling strength in the presence of dot and coupling drive, as long as the drive protocol only exhibits mild non-adiabaticity. Finally, the effects of initial states are studied in this situation, proving that the integrated work production in the long-time limit conforms to the second law of thermodynamics for a wide class of initial states and arbitrary drive and coupling strength. [less ▲]

Detailed reference viewed: 149 (31 UL)
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See detailTransport Characteristics of Granular Matter on a Forward Acting Grate
Peters, Bernhard UL; Dzuigys, A.

in COST Action MP1305 Flowing Matter (2014)

Detailed reference viewed: 13 (0 UL)
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See detailThe Transport Geography of Logistics and Freight Distribution.
Hesse, Markus UL; Rodrigue, Jean-Paul

in Journal of Transport Geography (2004), 12(2), 171-184

Detailed reference viewed: 321 (3 UL)
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See detailTransport in molecular states language: Generalized quantum master equation approach
Esposito, Massimiliano UL; Galperin, Michael

in Physical Review B (2009), 79(20),

Detailed reference viewed: 61 (0 UL)
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See detailLe transport national sans ... boussole! La Cour de Justice sur le temps de repos hebdomadaire normal
Ratti, Luca UL

in Revue Pratique de Droit Social (2019)

Detailed reference viewed: 42 (8 UL)
See detailTransport properties as a tool to study universal features of quench-induced dynamics in 1D systems
Calzona, Alessio UL; Gambetta, Filippo Maria; Cavaliere, Fabio et al

Poster (2017, August 14)

Detailed reference viewed: 37 (2 UL)
See detailTransport Properties as a Tool to Study Universal Quench-induced Dynamics in 1D Systems
Calzona, Alessio UL; Gambetta, Filippo Maria; Carrega, Matteo et al

Scientific Conference (2017, August 07)

The study of the relaxation process that follows a quantum quench in 1D systems still represents an open research field. Here we consider a sudden change of the interparticle interaction and we identify a ... [more ▼]

The study of the relaxation process that follows a quantum quench in 1D systems still represents an open research field. Here we consider a sudden change of the interparticle interaction and we identify a peculiar correlator of the system whose behavior is directly and deeply affected by the quench-induced dynamics. Interestingly, it features a universal power-law decay in time. Unfortunately, such a universal decay, although present, turns out to be subleading in intrinsic properties of the system such as the non- equilibrium spectral function. We thus consider a tunnel coupling of the system with a biased tip in order to be able to study also transport properties, namely the charge and energy current flowing from the tip to the system after the quench. In these quantities the universal power-law emerges clearly, especially if one focuses on energy current and its fractionalization into a right- and left- moving components. In particular, we show that the presence of a transient in the energy fractionalization ratio is a direct hallmark of the quench-induced relaxation. Within the setup we have considered, time-dependent transport properties are thus promoted to useful and promising tools to access the mechanisms at the base of the out-of- equilibrium dynamics following quantum quench. [less ▲]

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See detailTransport properties of a superconducting single-electron transistor coupled to a nanomechanical oscillator
Koerting, V.; Schmidt, Thomas UL; Doiron, C. B. et al

in Phys. Rev. B (2009), 79

We investigate a superconducting single-electron transistor capacitively coupled to a nanomechanical oscillator and focus on the double Josephson quasiparticle resonance. The existence of two coherent ... [more ▼]

We investigate a superconducting single-electron transistor capacitively coupled to a nanomechanical oscillator and focus on the double Josephson quasiparticle resonance. The existence of two coherent Cooper-pair tunneling events is shown to lead to pronounced back action effects. Measuring the current and the shot noise provides a direct way of gaining information on the state of the oscillator. In addition to an analytical discussion of the linear-response regime, we discuss and compare results of higher-order approximation schemes and a fully numerical solution. We find that cooling of the mechanical resonator is possible and that there are driven and bistable oscillator states at low couplings. Finally, we also discuss the frequency dependence of the charge noise and the current noise of the superconducting single electron transistor. [less ▲]

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See detailTransport properties of double quantum dots with electron-phonon coupling
Walter, Stefan; Trauzettel, Björn; Schmidt, Thomas UL

in Phys. Rev. B (2013), 88

We study transport through a double quantum dot system in which each quantum dot is coupled to a phonon mode. Such a system can be realized, e.g., using a suspended carbon nanotube. We find that the ... [more ▼]

We study transport through a double quantum dot system in which each quantum dot is coupled to a phonon mode. Such a system can be realized, e.g., using a suspended carbon nanotube. We find that the interplay between strong electron-phonon coupling and interdot tunneling can lead to a negative differential conductance at bias voltages exceeding the phonon frequency. Various transport properties are discussed, and we explain the physics of the occurrence of negative differential conductance in this system. [less ▲]

Detailed reference viewed: 59 (0 UL)
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See detailTransport properties of Majorana bound states networks in the Coulomb blockade regime
Ekström, Carl Johan Ingvar UL; Recher, Patrik; Schmidt, Thomas UL

E-print/Working paper (2019)

Topologically protected qubits based on nanostructures hosting Majorana bound states (MBSs) hold great promise for fault-tolerant quantum computing. We study the transport properties of nanowire networks ... [more ▼]

Topologically protected qubits based on nanostructures hosting Majorana bound states (MBSs) hold great promise for fault-tolerant quantum computing. We study the transport properties of nanowire networks hosting MBSs with a focus on the effects of the charging energy and the overlap between neighboring MBSs in short mesoscopic samples. In particular, we investigate structures hosting four MBSs such as T-junctions and Majorana boxes. Using a master equation in the Markovian approximation, we discuss the leading transport processes mediated by the MBSs. Single-electron tunneling and processes involving creation and annihilation of Cooper pairs dominate in the sequential tunneling limit. In the cotunneling regime the charge in the MBSs network is fixed and transport is governed by transitions via virtual intermediate states. Our results show that four-terminal measurements in the T-junction and Majorana box geometries can be useful tools for the characterization of the properties of MBSs with finite overlaps and charging energy. [less ▲]

Detailed reference viewed: 33 (1 UL)
See detailTransport Strategy, Policy and Institutions
Hesse, Markus UL

in Journal of Transport Geography (2006), 14

Detailed reference viewed: 71 (0 UL)
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See detailTransport through a quantum spin Hall antidot as a spectroscopic probe of spin textures
Rod, Alexia UL; Dolcetto, Giacomo UL; Rachel, Stephan et al

in Physical Review B (2016), 94

We investigate electron transport through an antidot embedded in a narrow strip of two-dimensional topological insulator. We focus on the most generic and experimentally relevant case with broken axial ... [more ▼]

We investigate electron transport through an antidot embedded in a narrow strip of two-dimensional topological insulator. We focus on the most generic and experimentally relevant case with broken axial spin symmetry. Spin-non-conservation allows additional scattering processes which change the transport properties profoundly. We start from an analytical model for noninteracting transport, which we also compare with a numerical tight-binding simulation. We then extend this model by including Coulomb repulsion on the antidot, and we study the transport in the Coulomb-blockade limit. We investigate sequential tunneling and cotunneling regimes, and we find that the current-voltage characteristic allows a spectroscopic measurement of the edge-state spin textures. [less ▲]

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See detailTransport through open quantum dots: Making semiclassics quantitative
Brezinova, Iva; Wirtz, Ludger UL; Rotter, Stefan et al

in Physical Review. B, Condensed Matter and Materials Physics (2010), 81(12),

We investigate electron transport through clean open quantum dots (quantum billiards). We present a semiclassical theory that allows to accurately reproduce quantum-transport calculations. Quantitative ... [more ▼]

We investigate electron transport through clean open quantum dots (quantum billiards). We present a semiclassical theory that allows to accurately reproduce quantum-transport calculations. Quantitative agreement is reached for individual energy-dependent and magnetic field dependent elements of the scattering matrix. Two key ingredients are essential: (i) inclusion of pseudopaths which have the topology of linked classical paths resulting from diffraction in addition to classical paths and (ii) a high-level approximation to diffractive scattering. Within this framework of the pseudopath semiclassical approximation (PSCA), typical shortcomings of semiclassical theories such as violation of the anticorrelation between reflection and transmission and the overestimation of conductance fluctuations are overcome. Beyond its predictive capabilities the PSCA provides deeper insights into the quantum-to-classical crossover. [less ▲]

Detailed reference viewed: 98 (1 UL)
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See detailTransport, geography and the ‘new’ mobilities
Shaw, Jon; Hesse, Markus UL

in Transactions of the Institute of British Geographers (2010), 35(3), 305-312

Detailed reference viewed: 205 (3 UL)
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See detailTransportation, freight rates, and economic geography
Behrens, Kristian; Picard, Pierre M. UL

in Journal of International Economics (2011), 85(2), 280-291

We investigate the role of competitive transport markets in shaping the location of economic activity and the pattern of trade. In our model, carriers supply transport services for shipping manufactured ... [more ▼]

We investigate the role of competitive transport markets in shaping the location of economic activity and the pattern of trade. In our model, carriers supply transport services for shipping manufactured goods, and freight rates are set to clear transport markets. Each carrier must commit to the maximum capacity for a round-trip and thus faces a logistics problem as there are opportunity costs of returning empty. These costs increase the freight rates charged to firms located in regions that are net exporters of manufactured goods. Since demand for transport services depends on the spatial distribution of economic activity, the concentration of production in one region raises freight rates to serve foreign markets from there, thus working against specialization and the agglomeration of firms. Consequently, a more even spatial distribution of firms and production prevails at equilibrium when freight rates are endogenously determined than when they are assumed to be exogenous as in the literature. [less ▲]

Detailed reference viewed: 109 (6 UL)
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See detailTransportation-cost inequalities on path spaces over manifolds carrying geometric flows
Cheng, Li Juan UL

in Bulletin des Sciences Mathématiques (2016), 140(5), 541-561

Let Lt:=Δt+ZtLt:=Δt+Zt for a C1,1C1,1-vector field Z on a differential manifold M possibly with a boundary ∂M , where ΔtΔt is the Laplacian operator induced by a time dependent metric gtgt differentiable ... [more ▼]

Let Lt:=Δt+ZtLt:=Δt+Zt for a C1,1C1,1-vector field Z on a differential manifold M possibly with a boundary ∂M , where ΔtΔt is the Laplacian operator induced by a time dependent metric gtgt differentiable in t∈[0,Tc)t∈[0,Tc). In this article, by constructing suitable coupling, transportation-cost inequalities on the path space of the (reflecting if ∂M≠∅∂M≠∅) diffusion process generated by LtLt are proved to be equivalent to a new curvature lower bound condition and the convexity of the geometric flow (i.e., the boundary keeps convex). Some of them are further extended to non-convex flows by using conformal changes of the flows. As an application, these results are applied to the Ricci flow with the umbilic boundary. [less ▲]

Detailed reference viewed: 138 (27 UL)
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See detailTransposition de la directive AIFM : dépositaires de fonds d'investissement alternatifs (FIA)
Riassetto, Isabelle UL

in Revue de Droit Bancaire et Financier (2013)

Detailed reference viewed: 117 (9 UL)