Photo-induced spin filtering in a double quantum dot

SU(4) Fermi liquid state and spin filtering in a double quantum dot system.

We study a symmetrical double quantum dot (DD) system with strong capacitive interdot coupling using renormalization group methods. The dots are attached to separate leads, and there can be a weak tunneling between them. In the regime where there is a single electron on the DD the low-energy behavior is characterized by an SU(4)-symmetric Fermi liquid theory with entangled spin and charge Kondo...

Weak values of electron spin in a double quantum dot.

We propose a protocol for a controlled experiment to measure a weak value of the electron's spin in a solid state device. The weak value is obtained by a two step procedure--weak measurement followed by a strong one (postselection), where the outcome of the first measurement is kept provided a second postselected outcome occurs. The setup consists of a double quantum dot and a weakly coupled qu...

Orbital and spin Kondo effects in a double quantum dot

– Motivated by recent experiments, in which the Kondo effect has been observed for the first time in a double quantum-dot structure, we study electron transport through a system consisting of two ultrasmall, capacitively-coupled dots with large level spacing and charging energy. Due to strong interdot Coulomb correlations, the Kondo effect has two possible sources, the spin and orbital degenera...

Spin dynamics in a double quantum dot: Exact diagonalization study

Noise-induced spectral shift measured in a double quantum dot

B. Küng,1,* S. Gustavsson,1 T. Choi,1 I. Shorubalko,1,2 T. Ihn,1 S. Schön,3 F. Hassler,4 G. Blatter,4 and K. Ensslin1 1Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland 2Electronics/Metrology/Reliability Laboratory, EMPA, 8600 Dübendorf, Switzerland 3FIRST Laboratory, ETH Zurich, 8093 Zurich, Switzerland 4Theoretische Physik, ETH Zurich, 8093 Zurich, Switzerland Received 23 A...