Conductance of tubular nanowires with disorder (2009)
Serra, Llorens, Choi, Mahn-Soo
We calculate the conductance of tubular-shaped nanowires having many potential scatterers at random positions. Our approach is based on the scattering matrix formalism and our results analyzed within...
Localized magnetic states in Rashba dots (2009)
Crisan, Mircea, Sanchez, David, Lopez, Rosa, Serra, Llorens, Grosu, Ioan
We study the formation of local moments in quantum dots arising in quasi-one dimensional electron wires due to localized spin-orbit (Rashba) interaction. Using an Anderson-like model to describe the...
Strongly modulated transmission of a spin-split quantum wire with local Rashba interaction (2007)
Sanchez, David, Serra, Llorens, Choi, Mahn-Soo
We investigate the transport properties of ballistic quantum wires in the presence of Zeeman spin splittings and a spatially inhomogeneous Rashba interaction. The Zeeman interaction is extended along...
Evanescent states in quantum wires with Rashba spin-orbit coupling (2007)
Serra, Llorens, Sanchez, David, Lopez, Rosa
We discuss the calculation of evanescent states in quasi-one-dimensional quantum wires in the presence of Rashba spin-orbit interaction. We suggest a computational algorithm devised for cases in...
From Coulomb blockade to the Kondo regime in a Rashba dot (2006)
Lopez, Rosa, Sanchez, David, Serra, Llorens
We investigate the electronic transport in a quantum wire with localized Rashba interaction. The Rashba field forms quasi-bound states which couple to the continuum states with an opposite spin...
Serra, Llorens, Sanchez, David
We analyze the linear conductance of a semiconductor quantum wire containing a region where a local Rashba spin-orbit interaction is present. We show that Fano lineshapes appear in the conductance...
Fano-Rashba effect in a quantum wire (2006)
Sanchez, David, Serra, Llorens
We predict the occurrence of Fano lineshapes in a semiconductor quantum wire with local spin-orbit (Rashba) coupling. We show that the Rashba interaction acts in a strictly one dimensional channel as...
Rashba interaction in quantum wires with in-plane magnetic fields (2005)
Serra, Llorens, Sanchez, David, Lopez, Rosa
We analyze the spectral and transport properties of ballistic quasi one-dimensional systems in the presence of spin-orbit coupling and in-plane agnetic fields. Our results demonstrate that Rashba...
Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots (2004)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens
The level splittings induced by a horizontal magnetic field in a parabolic two-dimensional quantum dot with spin-orbit interaction are obtained. Characteristic features induced by the spin-orbit...
Roto-vibrational spectrum and Wigner crystallization in two-electron parabolic quantum dots (2003)
Puente, Antonio, Serra, Llorens, Nazmitdinov, Rashid G.
We provide a quantitative determination of the crystallization onset for two electrons in a parabolic two-dimensional confinement. This system is shown to be well described by a roto-vibrational...
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens
Extending a previous work on spin precession in GaAs/AlGaAs quantum dots with spin-orbit coupling, we study the role of deformation in the external confinement. Small elliptical deformations are...
Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling (2003)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens
The influence of the Rashba spin-orbit coupling on the electron spin dynamics is investigated for a ballistic semiconductor quantum wire with a finite width. We monitor the spin evolution using the...
Symmetry breaking and the random-phase approximation in small quantum dots (2003)
Serra, Llorens, Nazmitdinov, Rashid G., Puente, A.
The random-phase approximation has been used to compute the properties of parabolic two-dimensional quantum dots beyond the mean-field approximation. Special emphasis is put on the ground state...
Spin-Orbit induced semiconductor spin guides (2002)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens
The tunability of the Rashba spin-orbit coupling allows to build semiconductor heterostructures with space modulated coupling intensities. We show that a wire-shaped spin-orbit modulation in a...
Electronic spin precession in semiconductor quantum dots with spin-orbit coupling (2002)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens, Lipparini, Enrico
The electronic spin precession in semiconductor dots is strongly affected by the spin-orbit coupling. We present a theory of the electronic spin resonance at low magnetic fields that predicts a...
Spin switching in semiconductor quantum dots through spin-orbit coupling (2002)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens, Lipparini, Enrico
The spin-orbit coupling influences the total spin of semiconductor quantum dots. We analyze the theoretical prediction for the combined effects of spin-orbit coupling, weak vertical magnetic fields...
Characterization of Bernstein modes in quantum dots (2002)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens, Gudmundsson, Vidar, Manolescu, Andrei
The dipole modes of non-parabolic quantum dots are studied by means of their current and density patterns as well as with their local absorption distribution. The anticrossing of the so-called...
Role of spin-orbit coupling in the far infrared absorption of lateral semiconductor dots (2002)
Valin-Rodriguez, Manuel, Puente, Antonio, Serra, Llorens
We investigate the relevance of the spin-orit coupling to the far-infrared absorption of two-dimensional semiconductor dots. Varying the strength of the Dresselhaus term, a mechanism feasible in...
Collective oscillations in quantum rings: a broken symmetry case (2000)
Valin-Rodriguez, M., Puente, Antonio, Serra, Llorens
We present calculations within density functional theory of the ground state and collective electronic oscillations in small two-dimensional quantum rings. No spatial symmetries are imposed to the...
Orbital current mode in elliptical quantum dots (1999)
Serra, Llorens, Puente, Antonio, Lipparini, Enrico
An orbital current mode peculiar to deformed quantum dots is theoretically investigated; first by using a simple model that allows to interpret analytically its main characteristics, and second, by...
Wave-vector dependence of spin and density multipole excitations in quantum dots (1999)
Barranco, Manuel, Colletti, Leonardo, Emperador, Agusti, Lipparini, Enrico, Pi, Marti, Serra, Llorens
We have employed time-dependent local-spin density functional theory to analyze the multipole spin and charge density excitations in GaAs-AlGaAs quantum dots. The on-plane transferred momentum degree...
Puente, Antonio, Serra, Llorens
We apply the time-dependent local-spin-density approximation as general theory to describe ground states and spin-density oscillations in the linear response regime of two-dimensional nanostructures...
Structure and far-infrared edge modes of quantum antidots at zero magnetic field (1998)
Emperador, Agusti, Pi, Marti, Barranco, Manuel, Lipparini, Enrico, Serra, Llorens
We have investigated edge modes of different multipolarity sustained by quantum antidots at zero magnetic field. The ground state of the antidot is described within a local density functional...
Current Density Functional approach to large quantum dots in intense magnetic fields (1997)
Pi, Marti, Barranco, Manuel, Emperador, Agusti, Lipparini, Enrico, Serra, Llorens
Within Current Density Functional Theory, we have studied a quantum dot made of 210 electrons confined in a disk geometry. The ground state of this large dot exhibits some features as a function of...