Workshop book - Physikzentrum der RWTH Aachen - RWTH Aachen ...

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Posters Monday February 4 Poster 6: Nonequilibrium transport through quantum dots with Dzyaloshinskii-Moriya interactions Mikhail Pletyukhov We study nonequilibrium transport through a single-orbital An<strong>der</strong>son model in a magnetic field with spin-dependent hopping amplitudes. In the cotunneling regime it is described by an effective spin-1/2 dot with a Dzyaloshinsky-Moriya-Kondo (DMK) interaction between the spin on the dot and the electron spins in the leads. Using a real-time renormalization group technique we show that at low temperatures (i) the DMK interaction is strongly renormalized, (ii) the renormalized magnetic field acquires a linear voltage dependence, and (iii) the differential conductance exhibits a voltage asymmetry which is strongly enhanced by logarithmic corrections. We propose transport measurements in which these signatures can be observed. 62
Posters Monday February 4 Poster 7: Spin-Orbit interactions and the Kondo effect Nancy Sandler Recent studies [1] have pointed out that the thermodynamics of the Kondo effect are essentially unaltered by the presence of Rashba spin-orbit interactions in a host two-dimensional electron gas. However, it has also been proposed [2]that the presence of bulk Rashba interactions induces a coupling between a magnetic impurity and conduction electrons with nonzero orbital angular momentum about the impurity site. This coupling appears as a combination of the standard Kondo exchange and the Dzyaloshinskii-Moriya interaction that, in the appropriate regime, produces an exponential enhancement of the Kondo temperature. In this work we review previous works and present recent results obtained by using the numerical renormalization group. In agreement with previous studies, we find only minor changes in the Kondo temperature scale when the Rashba coupling is increased at fixed Fermi energy. However, for fixed band filling, increasing the spin-orbit coupling can move the Fermi energy near to a Van Hove singularity in the effective density of states, leading to an exponential enhancement of the Kondo scale. Static spin correlations confirm that the impurity couples to conduction channels of nonzero orbital angular momentum. We also explore the effects of a magnetic field applied in the plane of the host system and extend our results to graphene systems. [1] J. Malecki, J. Stat. Phys. 129, 741 (2007); R. Zitko and J. Bonca, Phys. Rev. B 84, 193411 (2011). [2] M. Zarea, S. Ulloa and N. Sandler, Phys. Rev. Lett. 108, 046601 (2012). 63
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PROGRAM BOOK International workshop
Page 3 and 4:
What comes with this booklet With t
Page 5 and 6:
Getting to the institute (1) If you
Page 7 and 8:
Workshop lecture hall • The works
Page 9 and 10:
Lunch information Lunch will be tak
Page 11 and 12: Talks Monday February 4 Talk progra
Page 13 and 14: Talks Monday February 4 Notes 13
Page 29 and 30: Talks Tuesday February 5 Talks Tues
Page 31 and 32: Talks Tuesday February 5 Notes 31
Page 47 and 48: Talks Wednesday February 6 Talks We
Page 49 and 50: Talks Wednesday February 6 Notes 49
Page 55: Talks Wednesday February 6 Notes 55
Page 58 and 59: Posters Monday February 4 Poster 1:
Page 66 and 67: Posters Monday February 4 Poster 12
Page 72 and 73: Posters Tuesday February 5 Poster 2
Page 86 and 87: 18. Domenico Giuliano, Universita
Page 88 and 89: 55. Jens Paaske, Copenhagen Univers
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Workshop book - Physikzentrum der RWTH Aachen - RWTH Aachen ...

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