When a local and attractive potential is quenched in a nanowire, the spectrum changes its topology from a purely continuum to a continuum and discrete portion. We show that, under appropriate conditions, this quench leads to stable coherent oscillations in the observables’ time evolution. In particular, we demonstrate that ballistic nanowires with spin-orbit coupling (SOC) exposed to a uniform magnetic field are especially suitable to observe this effect. Indeed, while in ordinary nanowires the effect occurs only if the strength U0 of the attractive potential is sufficiently strong, even a weak value of U0 is sufficient in SOC nanowires. Furthermore, in these systems coherent oscillations in the spin sector can be generated and controlled electrically by quenching the gate voltage acting on the charge sector. We interpret the origin of this phenomenon, analyze the effect of variation of the chemical potential and the switching time of the quenched attractive potential, and address possible implementation schemes.

Coherent charge and spin oscillations induced by local quenches in nanowires with spin-orbit coupling / Cavaliere, F.; Ziani, N. T.; Dolcini, F.; Sassetti, M.; Rossi, F.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - STAMPA. - 100:15(2019), p. 155306. [10.1103/PhysRevB.100.155306]

Coherent charge and spin oscillations induced by local quenches in nanowires with spin-orbit coupling

Dolcini F.;Rossi F.
2019

Abstract

When a local and attractive potential is quenched in a nanowire, the spectrum changes its topology from a purely continuum to a continuum and discrete portion. We show that, under appropriate conditions, this quench leads to stable coherent oscillations in the observables’ time evolution. In particular, we demonstrate that ballistic nanowires with spin-orbit coupling (SOC) exposed to a uniform magnetic field are especially suitable to observe this effect. Indeed, while in ordinary nanowires the effect occurs only if the strength U0 of the attractive potential is sufficiently strong, even a weak value of U0 is sufficient in SOC nanowires. Furthermore, in these systems coherent oscillations in the spin sector can be generated and controlled electrically by quenching the gate voltage acting on the charge sector. We interpret the origin of this phenomenon, analyze the effect of variation of the chemical potential and the switching time of the quenched attractive potential, and address possible implementation schemes.
File in questo prodotto:
File Dimensione Formato  
Cavaliere-Traverso-Dolcini-Sassetti-Rossi_PRB_100_155306_2019 (Coherent acharge and spin oscillations induced by local quenches in nanowires with spin-orbit coupling).pdf

accesso aperto

Descrizione: Cavaliere-Traverso-Dolcini-Sassetti-Rossi_PRB_100_155306_2019
Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: PUBBLICO - Tutti i diritti riservati
Dimensione 1.26 MB
Formato Adobe PDF
1.26 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2765936
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo