We report results on the control of barrier transparency in InAs/InP nanowire quantum dots via the electrostatic control of the device electron states. Recent works demonstrated that barrier transparency in this class of devices displays a general trend just depending on the total orbital energy of the trapped electrons. We show that a qualitatively different regime is observed at relatively low filling numbers, where tunneling rates are rather controlled by the axial configuration of the electron orbital. Transmission rates versus filling are further modified by acting on the radial configuration of the orbitals by means of electrostatic gating, and the barrier transparency for the various orbitals is found to evolve as expected from numerical simulations. The possibility to exploit this mechanism to achieve a controlled continuous tuning of the tunneling rate of an individual Coulomb blockade resonance is discussed.

Orbital Tuning of Tunnel Coupling in InAs/InP Nanowire Quantum Dots

Sadre Momtaz Z.
;
Demontis V.;Zannier V.;Ercolani D.;Rossella F.;Sorba L.;Beltram F.;Roddaro S.
2020

Abstract

We report results on the control of barrier transparency in InAs/InP nanowire quantum dots via the electrostatic control of the device electron states. Recent works demonstrated that barrier transparency in this class of devices displays a general trend just depending on the total orbital energy of the trapped electrons. We show that a qualitatively different regime is observed at relatively low filling numbers, where tunneling rates are rather controlled by the axial configuration of the electron orbital. Transmission rates versus filling are further modified by acting on the radial configuration of the orbitals by means of electrostatic gating, and the barrier transparency for the various orbitals is found to evolve as expected from numerical simulations. The possibility to exploit this mechanism to achieve a controlled continuous tuning of the tunneling rate of an individual Coulomb blockade resonance is discussed.
2020
Settore FIS/03 - Fisica della Materia
Settore FIS/01 - Fisica Sperimentale
Coulomb blockade; electron tunneling rate; InAs/InP; nanowire; quantum dot; tunnel barrier
File in questo prodotto:
File Dimensione Formato  
acs.nanolett.9b04850.pdf

accesso aperto

Descrizione: manuscript published
Tipologia: Published version
Licenza: Creative Commons
Dimensione 4.1 MB
Formato Adobe PDF
4.1 MB Adobe PDF
nl9b04850_si_001.pdf

accesso aperto

Descrizione: supplementary material published
Tipologia: Published version
Licenza: Creative Commons
Dimensione 10.75 MB
Formato Adobe PDF
10.75 MB Adobe PDF

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/11384/85469
Citazioni
  • ???jsp.display-item.citation.pmc??? 4
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 12
social impact