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100 papers · 1 filter
Quantum thermodynamic uncertainty relation and macroscopic superconducting coherence
Franco Mayo, Nahual Sobrino, Rosario Fazio +2
Stability and efficiency are mutually exclusive in a thermodynamic process, e.g. in a thermal machine. Any effort to reduce the fluctuations of a certain output quantity is necessa…
Oxygen vacancy dynamics in Pt/TiOx/TaOy/Pt memristors: exchange with the environment and internal electromigration
Rodrigo Leal Martir, María José Sánchez, Myriam Aguirre +6
Memristors are expected to be one of the key building blocks for the development of new bio-inspired nanoelectronics. Memristive effects in transition metal oxides are usually link…
Challenges on Optical Printing of Colloidal Nanoparticles
Ianina L. Violi, Luciana P. Martinez, Mariano Barella +14
While colloidal chemistry provides ways to obtain a great variety of nanoparticles, with different shapes, sizes, material composition, and surface functions, their controlled depo…
Driven Liouville-von Neumann Equation for Quantum Transport and Multiple-Probe Green's Functions
Francisco Ramírez, Daniel Dundas, Cristián G. Sánchez +2
The so called Driven Liouville-von Neumann equation is a dynamical formulation to simulate a voltage bias across a molecular system and to model a time-dependent current in a grand…
Analytical solution of narrow quantum rings with general Rashba and Dresselhaus spin-orbit couplings
J. M. Lía, P. I. Tamborenea
We solve analytically the energy eigenvalue problem of narrow semiconductor quantum rings with a general spin-orbit term that includes as a special case the Rashba and Dresselhaus…
Spin dynamics of hot excitons in diluted magnetic semiconductors with spin-orbit interaction
Florian Ungar, Pablo Ignacio Tamborenea, Vollrath Martin Axt
We explore the impact of a Rashba-type spin-orbit interaction in the conduction band on the spin dynamics of hot excitons in diluted magnetic semiconductor quantum wells. In materi…
Exact analytical solution of a time-reversal-invariant topological superconducting wire
Armando A. Aligia, Alberto Camjayi
We consider a model proposed before for a time-reversal-invariant topological superconductor (TRITOPS) which contains a hopping term , a chemical potential , an extended -…
Catalogue of Andreev spectra and Josephson effects in structures with time-reversal-invariant topological superconductor wires
Liliana Arrachea, Alberto Camjayi, Armando A. Aligia +1
We study all the possible different two terminal configurations of Josephson junctions containing wires of time-reversal invariant topological superconductors (TRITOPS) and ordinar…
Topological quantum friction
M. Belén Farias, Wilton J. M. Kort-Kamp, Diego A. R. Dalvit
We develop the theory of quantum friction in two-dimensional topological materials. The quantum drag force on a metallic nanoparticle moving above such systems is sensitive to the…
Magnetic-optical transitions induced by twisted light in quantum dots
G. F. Quinteiro, D. E. Reiter, T. Kuhn
It has been theoretically predicted that light carrying orbital angular momentum, or twisted light, can be tuned to have a strong magnetic-field component at optical frequencies. W…
Spin-relaxation time in the impurity band of wurtzite semiconductors
Pablo I. Tamborenea, Thomas Wellens, Dietmar Weinmann +1
The spin-relaxation time for electrons in the impurity band of semiconductors with wurtzite crystal structure is determined. The effective Dresselhaus spin-orbit interaction Hamilt…
Kondo behavior and conductance through impurities in gold chains doped with oxygen
M. A. Barral, S. Di Napoli, G. Blesio +4
Combining ab initio calculations and effective models derived from them, we discuss the electronic structure of oxygen doped gold chains when one Au atom is replaced by any transit…
Fractional spin and Josephson effect in time-reversal-invariant topological superconductors
Alberto Camjayi, Liliana Arrachea, Armando Aligia +1
Time reversal invariant topological superconducting (TRITOPS) wires are known to host a fractional spin hbar/4 at their ends. We investigate how this fractional spin affects the Jo…
Time resolved heat exchange in driven quantum systems
Maria Florencia Ludovico, Jong Soo Lim, Michael Moskalets +2
We study time-dependent heat transport in systems composed of a resonant level periodically forced with an external power source and coupled to a fermionic continuum. This simple m…
Influence of non-magnetic impurity scattering on the spin dynamics in diluted magnetic semiconductors
Moritz Cygorek, Florian Ungar, Pablo Ignacio Tamborenea +1
The doping of semiconductors with magnetic impurities gives rise not only to a spin-spin interaction between quasi-free carriers and magnetic impurities, but also to a local spin-i…
Transport in quantum spin Hall edges in contact to a quantum dot
Bruno Rizzo, Alberto Camjayi, Liliana Arrachea
We study the transport mechanisms taking place in a quantum spin Hall bar with an embedded quantum dot, where electrons localize and experience Coulomb interaction U as well as spi…
Dynamics of energy transport and entropy production in ac-driven quantum electron systems
Maria Florencia Ludovico, Michael Moskalets, David Sanchez +1
We analyze the time-resolved energy transport and the entropy production in ac-driven quantum coherent electron systems coupled to multiple reservoirs at finite temperature. At slo…
Carrier-impurity spin transfer dynamics in paramagnetic II-VI diluted magnetic semiconductors in the presence of a wave-vector-dependent magnetic field
Moritz Cygorek, Pablo Ignacio Tamborenea, Vollrath Martin Axt
Quantum kinetic equations of motion for carrier and impurity spins in paramagnetic II-VI diluted magnetic semiconductors in a -dependent effective magnetic field are de…
Spin density wave instabilities in the NbS2 monolayer
F. Güller, V. L. Vildosola, A. M. Llois
In the present work, we study the magnetic properties of the NbS2 monolayer by first-principles calculations. The transition metal dichalcogenides (TMDC) are a family of laminar ma…
Relaxation and coherent oscillations in the spin dynamics of II-VI diluted magnetic quantum wells
Florian Ungar, Moritz Cygorek, Pablo I. Tamborenea +1
We study theoretically the ultrafast spin dynamics of II-VI diluted magnetic quantum wells in the presence of spin-orbit interaction. We extend a recent study where it was shown th…
Non-perturbative Correlation Effects in Diluted Magnetic Semiconductors
Moritz Cygorek, Pablo Ignacio Tamborenea, Vollrath Martin Axt
The effects of carrier-impurity correlations due to a Kondo-like spin-spin interaction in diluted magnetic semiconductors are investigated. These correlations are not only responsi…
Nanomagnet coupled to quantum spin Hall edge: An adiabatic quantum motor
Liliana Arrachea, Felix von Oppen
The precessing magnetization of a magnetic islands coupled to a quantum spin Hall edge pumps charge along the edge. Conversely, a bias voltage applied to the edge makes the magneti…
Adiabatic response and quantum thermoelectrics for ac driven quantum systems
Maria Florencia Ludovico, Francesca Battista, Felix von Oppen +1
We generalize the theory of thermoelectrics to include coherent electron systems under adiabatic ac driving, accounting for quantum pumping of charge and heat as well as the associ…
Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors
M. Cygorek, P. I. Tamborenea, V. M. Axt
We study the spin dynamics of carriers due to the Rashba interaction in semiconductor quantum disks and wells after excitation with light with orbital angular momentum. We find tha…