Emerging nonequilibrium bound state in spin-current–local-spin scattering

Doğan, Fatih; Covaci, Lucian; Kim, Wonkee; Marsiglio, F.

doi:10.1103/physrevb.80.104434

Cited by 3 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[15] and worked through in considerable detail in Ref. [35], for example. In these examples the role of the barrier is played by stationary but dynamical spin degrees of freedom that interact with the incoming wave packet.…”

Section: Discussionmentioning

confidence: 99%

Scattering Problems via Real-time Wave Packet Scattering

Staelens,

Marsiglio

2021

Preprint

View full text Add to dashboard Cite

In this paper, we use a straightforward numerical method to solve scattering models in onedimensional lattices based on a tight-binding band structure. We do this by using the wave packet approach to scattering, which presents a more intuitive physical picture than the traditional plane wave approach. Moreover, a general matrix diagonalization method that is easily accessible to undergraduate students taking a first course in quantum mechanics is used. Beginning with a brief review of wave packet transport in the continuum limit, comparisons are made with its counterpart in a lattice. The numerical results obtained through the diagonalization method are then benchmarked against analytic results. The case of a resonant dimer is investigated in the lattice, and several resonant values of the mean wave packet momentum are identified. The transmission coefficients obtained for a plane wave incident on a step potential and rectangular barrier are compared by investigating an equivalent scenario in a lattice. Lastly, we present several short simulations of the scattering process which emphasize how a simple methodology can be used to visualize some remarkable phenomena.

show abstract

Section: Discussionmentioning

confidence: 99%

Scattering Problems via Real-time Wave Packet Scattering

Staelens,

Marsiglio

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…We start by considering that a single spin-unpolarized and right-propagating electron pulse is injected into the fermionic chain, from the left [59,61,62,87,88]. Such a situation can be experimentally realized [89] by applying a Lorentzian voltage pulse that excites a soliton-like quasiparticle-the so-called leviton [90]-of elementary charge ( Q = I (t ) dt = e ), out of the Fermi sea.…”

Section: A Unitary Time Evolution For An Injected Single-electron Pul...mentioning

confidence: 99%

Electron-mediated entanglement of two distant macroscopic ferromagnets within a nonequilibrium spintronic device

Suresh,

Soares,

Mondal

et al. 2024

Phys. Rev. A

View full text Add to dashboard Cite

we demonstrate that a current pulse can be harnessed to entangle quantum localized spins of two spatially separated ferromagnets (FMs) which are initially unentangled. The envisaged setup is composed of a spin-polarizer (FM p ) and a spin-analyzer (FM a ) FM layers separated by a normal metal (NM) spacer. The injection of a current pulse into the device leads to a time-dependent superposition of many-body states characterized by a high degree of entanglement between the spin degrees of freedom of the two distant FM layers. The nonequilibrium dynamics are due to the transfer of spin angular momentum from itinerant electrons to the localized spins via a quantum spin-torque mechanism that remains active even for collinear but antiparallel arrangements of the FM p and FM a magnetizations (a situation in which the conventional spin torque is absent). We quantify the mixed-state entanglement generated between the FM layers by tracking the time evolution of the full density matrix and analyzing the build-up of the mutual logarithmic negativity over time. The effect of decoherence and dissipation in the FM layers due to coupling to bosonic baths at finite temperature, the use of multielectron current pulses, and the dependence on the number of spins are also considered in an effort to ascertain the robustness of our predictions under realistic conditions. Finally, we propose a "current-pump-x-ray-probe" scheme, utilizing ultrafast x-ray spectroscopy, that can witness nonequilibrium and transient entanglement of the FM layers by extracting its time-dependent quantum Fisher information.

show abstract

Scattering problems via real-time wave packet scattering

Staelens

Marsiglio

2021

American Journal of Physics

View full text Add to dashboard Cite

[Media: see text] In this paper, we use a straightforward numerical method to solve scattering models in one-dimensional lattices based on a tight-binding band structure. We do this by using the wave packet approach to scattering, which presents a more intuitive physical picture than the traditional plane wave approach. Moreover, a general matrix diagonalization method that is easily accessible to undergraduate students taking a first course in quantum mechanics is used. Beginning with a brief review of wave packet transport in the continuum limit, comparisons are made with its counterpart in a lattice. The numerical results obtained through the diagonalization method are then benchmarked against analytic results. The case of a resonant dimer is investigated in the lattice, and several resonant values of the mean wave packet momentum are identified. The transmission coefficients obtained for a plane wave incident on a step potential and rectangular barrier are compared by investigating an equivalent scenario in a lattice. Finally, we present several short simulations of the scattering process, which emphasize how a simple methodology can be used to visualize some remarkable phenomena.

show abstract

Emerging nonequilibrium bound state in spin-current–local-spin scattering

Cited by 3 publications

References 37 publications

Scattering Problems via Real-time Wave Packet Scattering

Scattering Problems via Real-time Wave Packet Scattering

Electron-mediated entanglement of two distant macroscopic ferromagnets within a nonequilibrium spintronic device

Scattering problems via real-time wave packet scattering

Contact Info

Product

Resources

About