Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Transport: Nanoelectronics I - Quantum Dots and Wires, Point Contacts 2
TT 11.8: Vortrag
Montag, 23. März 2009, 16:00–16:15, HSZ 301
Electron-Spin-Resonance (ESR) in Triple Quantum Dots — •Maria Busl1, Rafael Sánchez1,2, and Gloria Platero1 — 1ICMM, CSIC, Cantoblanco, E-28049 Madrid — 2Département de Physique Théorique, Université de Genève, CH-1211 Genève 4
In the last years a big effort has been devoted to measure ESR in single and double quantum dots [1]. There, crossed DC and AC magnetic fields with a frequency resonant to the Zeeman splitting in the dots drive electrons to perform spin coherent rotations.
We analyze coherent spin rotations induced by an AC magnetic field in a DC biased triple quantum dot (TQD), both in linear and triangular configuration, filled with one and two extra electrons. We analyze the case where the DC magnetic field is homogeneous and the case where an inhomogeneous DC magnetic field yields to different Zeeman splittings within each dot.
We will discuss how coherent population trapping, which occurs in a TQD filled with one electron[2], is affected by the AC field. There, the electron can be forced to perform single spin rotations induced by the field. Those are stable against decoherence coming from the leads, once the electron drops in the so-called dark state. In the case of two extra electrons, we analyze spin blockade in the presence of the AC magnetic field.
[1] F. H. L. Koppens et al., Nature 442, 766 (2006)
[2] C. Emary, PRB 76, 245319 (2007)