TITLE

Singlet-triplet transition in a few-electron lateral In0.75Ga0.25As/In0.75Al0.25As quantum dot

AUTHOR(S)
Deon, F.; Pellegrini, V.; Carillo, F.; Giazotto, F.; Biasiol, G.; Sorba, L.; Beltram, F.
PUB. DATE
April 2010
SOURCE
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p142107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The magnetic-field evolution of Coulomb blockade peaks in lateral In0.75Ga0.25As/In0.75Al0.25As quantum dots in the few-electron regime is reported. Quantum dots are defined by gates evaporated onto a 60-nm-thick hydrogen silsesquioxane insulating film. A gyromagnetic factor g*≈4.4 is measured via zero-bias spin spectroscopy and a transition from singlet to triplet spin configuration is found at an in-plane magnetic field B=0.7 T. This observation opens the way to the manipulation of singlet and triplet states at moderate fields and its relevance for quantum information applications will be discussed.
ACCESSION #
49071250

 

Related Articles

  • Spin-dependent conductance in FM/quantum-dot/FM tunneling system. Qin, L.; Guo, Y. // European Physical Journal B -- Condensed Matter;Aug2007, Vol. 58 Issue 4, p395 

    We present a theoretical study of the spin-dependent conductance spectra in a FM/semiconductor quantum-dot (QD)/FM system. Both the Rashba spin-orbit (SO) coupling in the QD and spin-flip scattering caused by magnetic barrier impurities are taken into account. It is found that in the...

  • Spin phases and currents in ring shaped one-dimensional quantum dot arrays. Bellucci, S.; Onorato, P. // Journal of Applied Physics;Apr2010, Vol. 107 Issue 7, p073703 

    The electronic states of an array of Nd quantum dots (QDs) patterned in an isolated quantum ring are calculated. An external magnetic field B perpendicular to the ring’s plane is considered. The single particle spectra show the presence of an insulating pseudoband which can be totally...

  • Parallel spin filling and energy spectroscopy in few-electron Si metal-on-semiconductor-based quantum dots. Xiao, M.; House, M. G.; Jiang, H. W. // Applied Physics Letters;7/19/2010, Vol. 97 Issue 3, p032103 

    We report the spin filling pattern in the few electron limit of silicon metal-on-semiconductor based quantum dots (QDs). Magnetic field dependence of Coulomb oscillation peaks showed filling of parallel spins for the last few electrons. This implies the existence of a large spin exchange energy...

  • Electron and Hole States in Vertically Coupled Self-Assembled InGaAs Quantum Dots. Korkusinski, M.; Sheng, W.; Hawrylak, P.; Wasilewski, Z.; Ortner, G.; Bayer, M.; Babinski, A.; Potemski, M. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p685 

    We report results of theoretical and experimental study of optical properties of vertically coupled self-assembled InGaAs quantum dots. The theoretical calculations include atomistic tight-binding model in the effective-bond-orbital approximation coupled with Peierls substitution to include the...

  • Crossing Effects in Resonant Magnetotransport Through Quantum Dot Arrays. Burdov, V. A.; Nlikhaylova, N. A. // Journal of Superconductivity & Novel Magnetism;Feb2007, Vol. 20 Issue 2, p187 

    Resonant electron tunneling through the heterolayer containing quantum dot array has been investigated theoretically in an ultrahigh magnetic field, which is normal to the layer. It has been shown that tile heterolayer transparency undergoes the crossing effect under the varying of the gate...

  • Geometric Phase of Quantum Dots in the Time-Dependent Isotropic Magnetic Field. Zhao-Xian Yu; Zhi-Yong Jiao // International Journal of Theoretical Physics;Mar2010, Vol. 49 Issue 3, p652 

    By using of the invariant theory, we have studied the geometric phase of quantum dots in the time-dependent isotropic magnetic field, the dynamical and geometric phases are given, respectively.

  • Ultrafast optical spin echo in a single quantum dot. Press, David; De Greve, Kristiaan; McMahon, Peter L.; Ladd, Thaddeus D.; Friess, Benedikt; Schneider, Christian; Kamp, Martin; Höfling, Sven; Forchel, Alfred; Yamamoto, Yoshihisa // Nature Photonics;Jun2010, Vol. 4 Issue 6, p367 

    Many proposed photonic quantum networks rely on matter qubits to serve as memory elements. The spin of a single electron confined in a semiconductor quantum dot forms a promising matter qubit that may be interfaced with a photonic network. Ultrafast optical spin control allows gate operations to...

  • Propagation of electron waves in InAs/AlGaSb. Maemoto, Toshihiko; Koyama, Masatoshi; Nakashima, Atsushi; Nakai, Masato; Sasa, Shigehiko; Bird, J. P.; Inoue, Masataka // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p817 

    We report on magneto-transport characteristics of InAs/AlGaSb quantum open dot and anti-dot structures. Aperiodic oscillations have been observed at low magnetic fields in addition to the Shubnikov-de-Haas oscillations measured at 4.2K. The characteristics are due to the ballistic nature of...

  • Spin splitting in open quantum dots. Evaldsson, M.; Zozoulenko, I. V.; Ciorga, M.; Zawadzki, P.; Sachrajda, A. S. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p1413 

    We demonstrate that the magnetoconductance of small lateral quantum dots in the strongly-coupled regime (i.e. when the leads can support one or more propagating modes) shows a pronounced splitting of the conductance peaks and dips which persists over a wide range of magnetic fields (from zero...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics