44 citations · 509 across the 27 of their papers we have counts for
20 papers · 1 filter
Thomson rings in a disk
M. Cerkaski, R. G. Nazmitdinov, A. Puente
We discuss the basic principles of a self-organization of a finite number of charged particles interacting via the 1/r Coulomb potential in a disk geometry. Our approach is based o…
Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra
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…
Quantum dots based on spin properties of semiconductor heterostructures
M. Valin-Rodriguez, A. Puente, L. Serra
The possibility of a novel type of semiconductor quantum dots obtained by spatially modulating the spin-orbit coupling intensity in III-V heterostructures is discussed. Using the e…
Roto-vibrational spectrum and Wigner crystallization in two-electron parabolic quantum dots
Antonio Puente, Llorens Serra, Rashid G. Nazmitdinov
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 ro…
Spin splitting and precession in quantum dots with spin-orbit coupling: the role of spatial deformation
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra
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 de…
Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra
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 ev…
Symmetry breaking and the random-phase approximation in small quantum dots
Llorens Serra, Rashid G. Nazmitdinov, A. Puente
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…
Spin-Orbit induced semiconductor spin guides
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra
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 mod…
Electronic spin precession in semiconductor quantum dots with spin-orbit coupling
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra +1
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 th…
Spin switching in semiconductor quantum dots through spin-orbit coupling
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra +1
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 vertica…
Characterization of Bernstein modes in quantum dots
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra +2
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 t…
Role of spin-orbit coupling in the far infrared absorption of lateral semiconductor dots
Manuel Valin-Rodriguez, Antonio Puente, Llorens Serra
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 mechani…
Far infrared absorption in triangular and square quantum dots: characterization of corner and side modes
Manuel Valín-Rodríguez, Antonio Puente, Llorenç Serra
The far-infrared absorption of triangular and square two-dimensional quantum dots is studied by means of time simulations of the density oscillations within the time-dependent loca…
Hartree-Fock dynamics in highly excited quantum dots
Antonio Puente, Llorenç Serra, Vidar Gudmundsson
Time-dependent Hartree-Fock theory is used to describe density oscillations of symmetry-unrestricted two-dimensional nanostructures. In the small amplitude limit the results reprod…
Magnetic dipole and electric quadrupole responses of elliptic quantum dots in magnetic fields
Enrico Lipparini, Llorenç Serra, Antonio Puente
The magnetic dipole (M1) and electric quadupole (E2) responses of two-dimensional quantum dots with an elliptic shape are theoretically investigated as a function of the dot deform…
Ground state and far-infrared absorption of two-electron rings in a magnetic field
Antonio Puente, Llorenç Serra
Motivated by recent experiments [A. Lorke {\em et al.}, Phys. Rev. Lett.\ {\bf 84}, 2223 (2000)] an analysis of the ground state and far-infrared absorption of two electrons confin…
Magnetic Thomas-Fermi-Weizsäcker model for quantum dots: a comparison with Kohn-Sham ground states
Llorenç Serra, Antonio Puente
The magnetic extension of the Thomas-Fermi-Weizsäcker kinetic energy is used within density-functional-theory to numerically obtain the ground state densities and energies of two-d…
A semiclassical approach to the ground state and density oscillations of quantum dots
A. Puente, M. Casas, Ll. Serra
A semiclassical Thomas-Fermi method, including a Weizsäcker gradient term, is implemented to describe ground states of two dimensional nanostructures of arbitrary shape. Time depen…
Orbital current mode in elliptical quantum dots
Llorens Serra, Antonio Puente, Enrico Lipparini
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 characteristic…
Oscillation modes of two-dimensional nanostructures within the time-dependent local-spin-density approximation
Antonio Puente, Llorens Serra
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-dimensio…