DFG Logo
Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht

Projekt

Ansprechpartner1
PD Dr. Georg Schmidt
Adresse1

Physikalisches Institut
Universität Würzburg
Am Hubland
97074 Würzburg

Tel.:
Tel.:0931 888 5899
Fax:
Fax:0931 888 5142
Ansprechpartner2
Prof. Dr. Laurens W. Molenkamp
Adresse2

Physikalisches Institut
Universität Würzburg
Am Hubland
97074 Würzburg

Tel.:
Tel.:0931 888 4925
Fax:
Fax:0931 888 5142
Projekttitel
Spin filtering in magnetic II/VI semiconductor quantum dot systems
Projektbeschreibung

The research project is focused on the investigation of spin transport and spin filtering effects in semiconductor quantum dots placed in tunnel barriers. The dots under investigation will either be placed in a magnetically doped environment or coupled to a magnetic reservoir. The dots are fabricated by self-organized growth in molecular beam epitaxy (MBE). We will investigate II/VI semiconductors, especially CdSe quantum dots in an n-doped dilute magnetic environment. For these dots a local coupling between the electrons in a single dot and the surrounding Mn ions has already been demonstrated. The effect leads to a local ferromagnetic coupling with a zero field giant Zeeman splitting although the system is intrinsically not ferromagnetic. This makes such systems suitable spin filters even without any external magnetic field. These dots will be investigated in large area and sub micron sized mesas, the latter may also be fitted with side gates for control of the electronic levels. In addition we will investigate systems fitted with dilute magnetic emitters or stacked quantum dot systems for the demonstration of spin filtering and detection of spin polarized currents by quantum dots.

Zurück

Wichtige Termine:


15. Sept. 2013:
Deadline für den Sonderband Semiconductor Spintronics (DFG-Abschlussbericht) in physica status solidi b
(nähere Informationen wurden per Email zugeschickt)


30. Sept. - 2. Okt. 2013:
Abschlusstreffen des Schwerpunktprogramms "International workshop on semiconductor spintronics" in der Residenz Würzburg
(nähere Informationen)

Aktuelle Veröffentlichung(en):

C. Drexler, S.A. Tarasenko, P. Olbrich, J. Karch, M. Hirmer, F. Müller, M. Gmitra, J. Fabian, R. Yakimova, S. Lara-Avila, S. Kubatkin, M. Wang, R. Vajtai, P. M. Ajayan, J. Kono, and S.D. Ganichev :  "Magnetic quantum ratchet effect in graphene" Nature Nanotechnology 8, 104 (2013)

J.H. Buß, J. Rudolph, S. Shvarkov, H. Hardtdegen, A.D. Wieck, and D. Hägele:  "Long electron spin coherence in ion‐implanted GaN: The role of localization" Appl. Phys. Lett. 102, 192102 (2013)

D.J. English, J. Hübner, P.S. Eldridge, D. Taylor, M. Henini, R.T. Harley, and M. Oestreich:  "Effect of symmetry reduction on the spin dynamics of (001)-oriented GaAs quantum wells" Phys. Rev. B 87, 075304 (2013)

V.L. Korenev, I.A. Akimov, S.V. Zaitsev, V.F. Sapega, L. Langer, D.R. Yakovlev, Yu. A. Danilov, and M. Bayer:  "Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid" Nature Communications 3, 959 (2012)

M. Althammer, E.-M. Karrer-Müller, S.T.B. Goennenwein, M. Opel, R. Gross:  "Spin transport and spin dephasing in zinc oxide" Appl. Phys. Lett. 101, 082404 (2012)