Arturo Wong

Kondo effect in graphene with Rashba spin-orbit coupling

We study the Kondo screening of a magnetic impurity adsorbed in graphene in the presence of Rashba spin-orbit interaction. The system is described by an effective single-channel Anderson impurity model, which we analyze using the numerical renormalization group. The nontrivial energy dependence of the host density of states gives rise to interesting behaviors under variation of the chemical potential or the spin-orbit coupling. Varying the Rashba coupling produces strong changes in the Kondo temperature characterizing the many-body screening of the impurity spin, and at half filling allows an approach to a quantum phase transition separating the strong-coupling Kondo phase from a free-moment phase. Tuning the chemical potential close to sharp features of the hybridization function results in striking features in the temperature dependencies of thermodynamic quantities and in the frequency dependence of the impurity spectral function.

Spin Hall and longitudinal conductivity of a conserved spin current in two dimensional heavy-hole gases

The spin Hall and longitudinal conductivity of a two-dimensional (2D) heavy-hole gas with

Influence of Rashba spin-orbit coupling on the Kondo effect

k

Spin-torque contribution to the ac spin Hall conductivity

-cubic Rashba and Dresselhaus spin-orbit interaction is studied in the ac frequency domain. Using Kubo linear-response theory and a recently proposed definition for the (conserved) spin current operator suitable for spin-3/2 holes, it is shown that the spin conductivity tensor exhibit very distinguishable features from those obtained with the standard definition of the spin current. This is due to a significant contribution of the spin-torque term arisen from the alternative definition of spin current which strongly affects the magnitude and the sign of the dynamic spin current. In the dc (free of disorder) limit, the spin Hall conductivity for only (or dominant)

Quantum phase transitions into Kondo states in bilayer graphene

k

Signatures of quantum phase transitions in parallel quantum dots: Crossover from local moment to underscreened spin-1 Kondo physics

-cubic Rashba coupling is

Kondo physics in the presence of Rashba spin-orbit interactions

{\ensuremath{\sigma}}_{xy}^{s,z}(0)=\ensuremath{-}9e/8\ensuremath{\pi}

Zero-field splitting of the Kondo resonance and quantum criticality in triple quantum dots.

, whereas

Interplay between the Kondo, Rashba, and Zeeman effects

{\ensuremath{\sigma}}_{xy}^{s,z}(0)=\ensuremath{-}3e/8\ensuremath{\pi}

Kondo effect in graphene with Rashba spin-orbit interaction

for only (or dominant)