Electronic state of a free-standing domain wall in 1T-TaS2 can be explained as a would-be metallic state resulting from the Mottness collapse: the full metalization is preempted by the splitting of the quasiparticle band into bonding and antibonding subbands separated by a band gap. This picture is consistent with the experimental tunneling spectra.
COBISS.SI-ID: 32057895
We demonstrate the Josephson effect in a serial double quantum dot defined in a nanowire with epitaxial superconducting leads. The consistency between experiment and theory indicates that our device is a faithful realization of the two-impurity Anderson model.
COBISS.SI-ID: 31982375
Highly-tunable double quantum dot (DQD) is coupled to a superconductor and characterized via tunneling spectroscopy using a further normal-state electrode. It is shown how the honeycomb pattern characteristic of DQDs with normal-state leads is replaced by lines of zero-energy Yu-Shina-Rusinov states that delineate the different ground states of the system.
COBISS.SI-ID: 31479335
We study the exchange interaction between two impurities on the (111) surface which hosts surface states using the density matrix renormalization group (DMRG), using a representation which allows obtaining high accuracy results in the thermodynamic limit. Ferromagnetism is never developped, except at short distances.
COBISS.SI-ID: 30561063
In the single-impurity Anderson model we identify a line in the (U-n) parameter plane where the asymmetry of the scattering-rate becomes zero. This line, defined through impurity dynamics, traces out the cross-over between the weak-coupling and strong-coupling regimes.
COBISS.SI-ID: 31834407