title: Tunable Esaki Effect in Catalyst-Free InAs/GaSb Core-Shell Nanowires.
abstract: We demonstrate tunable bistability and a strong negative differential resistance in InAs/GaSb core-shell nanowire devices embedding a radial broken-gap heterojunction. Nanostructures have been grown using a catalyst-free synthesis on a Si substrate. Current-voltage characteristics display a top peak-to-valley ratio of 4.8 at 4.2 K and 2.2 at room temperature. The Esaki effect can be modulated-or even completely quenched-by field effect, by controlling the band bending profile along the azimuthal angle of the radial heterostructure. Hysteretic behavior is also observed in the presence of a suitable resistive load. Our results indicate that high-quality broken-gap devices can be obtained using Au-free growth.
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Rocci
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Rossella
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: U P
authors.initials: UP
authors.lastname: Gomes
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Zannier
authors.affiliation: IMEM-CNR ,Parco Area delle Scienze 37/A, I-43010 Parma, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Rossi
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Ercolani
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Sorba
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Beltram
authors.affiliation: NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12, I-56127 Pisa, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Roddaro