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Thursday, August 14 • 11:00 - 13:00
Spintronics & Spin Phenomena VII

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11:00-11:30

Invited: Tomasz Smolenski
CdSe Quantum Dot with a Single Manganese Ion - A New System for a Single Spin Manipulation
Co-authors: Jakub Kobak, Mateusz Goryca, Aleksander Bogucki, Maciej Koperski, Jean-Guy Rousset, Jan Suffczynski, Michal Nawrocki, Andrzej Golnik, Piotr Kossacki, Wojciech Pacuski

Semiconductor quantum dot (QD) with a single magnetic ion is a spin-memory providing an easy optical access. However, a severe limitation for its operation was attributed to the recombination channel introduced by magnetic ions for a wide group of systems (e.g. CdSe/ZnSe QDs), in which the exciton energy is higher than the intra-ionic transition energy. As a result, the only QDs with single magnetic dopants explored so far were CdTe/ZnTe and InAs/GaAs QDs embedding Mn ions.

Here we report on the first observation of a CdSe/ZnSe QD with a single Mn ion [1]. Our time-resolved measurements reveal the same exciton lifetime for CdSe dot with and without a single Mn ion. It shows that the exciton emission quenching, even if energetically allowed, is negligible for a QD with a single dopant.

We demonstrate all-optical control of the Mn spin in the novel structure. It is achieved by injecting optically created spin-polarized excitons to a CdSe dot. Moreover, we determine the Mn ion spin relaxation time in a CdSe QD to be over an order of magnitude longer than the respective relaxation time of the Mn spin in a previously studied CdTe QD [1]. This result clearly shows that switching to the QD material with a weaker spin-orbit interaction significantly increases the storage time of information written on the ion spin.

[1] J. Kobak, T. Smolenski, M. Goryca, M. Papaj, K. Gietka, A. Bogucki, M. Koperski, J.-G. Rousset, J. Suffczynski, E. Janik, M. Nawrocki, A. Golnik, P. Kossacki and W. Pacuski, Nature Communications 5, 3191 (2014).

11:30-11:45
Oral: Maciej Koperski
Magnetic Anisotropy of Several Mn2+ Ions in a CdTe/ZnTe Quantum Dot
Co-authors: Mateusz Goryca, Tomasz Smoleński, Piotr Wojnar, Marek Potemski, Piotr Kossacki

11:45-12:00
Oral: Shou-Jyun Zou
Exposure of the Underlying Anti-Ferromagnetism in Paramagnetic Semiconductor CdSe:Mn Nanocrystals
Co-authors: Ming-Fan Wu, Wen-Bin Jian, Shun-Jen Cheng

12:00-12:15
Oral: Takafumi Fujita
Single Photoelectron Spin Detection & Angular Momentum Transfer in a Lateral Double Quantum Dot
Co-authors: Kazuhiro Morimoto, Giles Allison, Marcus Larsson, Haruki Kiyama, Soichiro Teraoka, Arne Ludwig, Andreas Wieck, Akira Oiwa, Seigo Tarucha

12:15-12:30
Oral: Mateusz Goryca
Coherent Oscillations of an Individual Mn Spin
Co-authors: Maciej Koperski, Piotr Wojnar, Tomasz Smolenski, Tomasz Kazimierczuk, Andrzej Golnik, Piotr Kossacki

12:30-12:45
Oral: Mathieu Munsch
Manipulation of the Nuclear Spin Ensemble in a Quantum Dot with Chirped Magnetic Resonance Pulses
Co-authors: Gunter Wüst, Andreas Kuhlmann, Fei XueArne Ludwig, Dirk Reuter, Andreas Wieck, Martino Poggio, Richard Warburton

12:45-13:00
Oral: Felix Hernandez
A New Observation of the Spin Hall Effect: Exploring the Clean Limit
Co-authors: Leonardo Nunes, Gennady Gusev, Askhat Bakarov 

Session Chairs
GK

Giti Khodaparast

Virginia Tech

Speakers
TS

Tomasz Smolenski

University of Warsaw


Thursday August 14, 2014 11:00 - 13:00
Room 18CD

Attendees (9)