We discover and characterise strong quantum scars, or quantum eigenstates resembling classical periodic orbits, in two-dimensional quantum wells perturbed by local impurities. These scars are not explained by ordinary scar theory, which would require the existence of short, moderately unstable periodic orbits in the perturbed system. Instead, they are supported by classical resonances in the un...

The authors report correlations between variations in charge transport of electrons and holes in synthetic single crystal diamond and the presence of nitrogen impurities and dislocations. The spatial distribution of these defects was imaged using their characteristic luminescence emission and compared with maps of carrier drift length measured by ion beam induced charge imaging. The images indi...

Results of injected impurity transport studies on the Alcator A tokamak are presented. We find that injected silicon diffuses throughout. the plasma and is then observed, contrary to the predictions of neoclassical theory, to leave the discharge, having confinement times much shorter than the discharge length. There is no observed build-up of silicon on the axis of the device. The impurity conf...

We measure transport through gold grain quantum dots fabricated using electromigration, with magnetic impurities in the leads. A Kondo interaction is observed between dot and leads, but the presence of magnetic impurities results in a gate-dependent zero-bias conductance peak that is split due to a RKKY interaction between the spin of the dot and the static spins of the impurities. A magnetic f...

A large diffusive turbulent contribution to the radial impurity transport in Wendelstein 7-X (W7-X) plasmas has been experimentally inferred during first campaigns and numerically confirmed by means of gyrokinetic simulations with code stella. In general, absence strong accumulation initial W7-X is attributed this term. present work also calculated other stellarator plasmas. particular, diffusi...

The heats o f transport o f several substitutional impurities (such as Sb, Sn, In, Ag, N i and Co) in copper and silver are discussed in terms o f atom ic quantities. They are considered as consisting of essentially two parts. The first one, the so-called intrinsic heat o f transport, can be derived from the electrostatic potential generated by the im purity at the site o f a normal lattice ato...

In this article, a scanning probe method based on nanoscale capacitance measurements was used to investigate the lateral homogeneity of the electron mean free path both in pristine and ion-irradiated graphene. The local variations in the electronic transport properties were explained taking into account the scattering of electrons by charged impurities and point defects (vacancies). Electron me...