title: Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling.
abstract: Evidence is presented for the finite wave vector crossing of the two lowest one-dimensional spin-split subbands in quantum point contacts fabricated from two-dimensional hole gases with strong spin-orbit interaction. This phenomenon offers an elegant explanation for the anomalous sign of the spin polarization filtered by a point contact, as observed in magnetic focusing experiments. Anticrossing is introduced by a magnetic field parallel to the channel or an asymmetric potential transverse to it. Controlling the magnitude of the spin splitting affords a novel mechanism for inverting the sign of the spin polarization.
authors.affiliation: Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Stefano
authors.initials: S
authors.lastname: Chesi
authors.forename: Gabriele F
authors.initials: GF
authors.lastname: Giuliani
authors.forename: L P
authors.initials: LP
authors.lastname: Rokhinson
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West