title: Longitudinal wave function control in single quantum dots with an applied magnetic field.
abstract: Controlling single-particle wave functions in single semiconductor quantum dots is in demand to implement solid-state quantum information processing and spintronics. Normally, particle wave functions can be tuned transversely by an perpendicular magnetic field. We report a longitudinal wave function control in single quantum dots with a magnetic field. For a pure InAs quantum dot with a shape of pyramid or truncated pyramid, the hole wave function always occupies the base because of the less confinement at base, which induces a permanent dipole oriented from base to apex. With applying magnetic field along the base-apex direction, the hole wave function shrinks in the base plane. Because of the linear changing of the confinement for hole wave function from base to apex, the center of effective mass moves up during shrinking process. Due to the uniform confine potential for electrons, the center of effective mass of electrons does not move much, which results in a permanent dipole moment change and an inverted electron-hole alignment along the magnetic field direction. Manipulating the wave function longitudinally not only provides an alternative way to control the charge distribution with magnetic field but also a new method to tune electron-hole interaction in single quantum dots.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Cao
authors.affiliation: 1] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China [2] Institute of Photo-electronic Thin Film Devices and Technology, Nankai University, Tianjin, 300071, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Tang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Yunan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Kangsheng
authors.initials: K
authors.lastname: Qiu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Min
authors.initials: M
authors.lastname: He
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Jin-An
authors.initials: JA
authors.lastname: Shi
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.affiliation: Hitachi Cambridge Laboratory, Cavendish Laboratory, Cambridge CB3 0HE, United Kingdom.
authors.forename: David A
authors.initials: DA
authors.lastname: Williams
authors.affiliation: Department of Physics, Fudan University, Shanghai, 200433, China.
authors.forename: Weidong
authors.initials: W
authors.lastname: Sheng
authors.affiliation: 1] Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing, China.
authors.forename: Kuijuan
authors.initials: K
authors.lastname: Jin
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
authors.forename: Xiulai
authors.initials: X
authors.lastname: Xu