Spin dependent conductance of a quantum dot side attached to topological superconductors as a probe of Majorana fermion states

Spin-polarized transport through a quantum dot side attached to a topological superconductor and coupled to a pair of normal leads is discussed in Coulomb and Kondo regimes. For discussion of Coulomb range equation of motion method with extended Hubbard I approximation is used and Kondo regime is analyzed by Kotliar-Ruckenstein slave boson approach. Apart from the occurrence of zero bias anomaly the presence of Majorana states reflects also in splitting of Coulomb lines. In the region of Coulomb borders the spin dependent negative differential conductance is observed. Due to the low energy scale of Kondo effect this probe allows for detection of Majorana states even for extremely weak coupling with topological wire. In this range no signatures of Majorana states appear in Coulomb blockade dominated transport.Comment: 3 pages, 3 figure

Dyskursywne (re)konstruowanie charyzmy. Przypadek Lecha Wałęsy

The paper analyzes the discursive reconstruction of L. Wałęsa’s charisma by the Gazeta Wyborcza newspaper in response to S. Cenckiewicz and P. Gontarczyk’s book entitled SB a Lech Wałęsa. Przyczynek do biografii [The secret police and Lech Wałęsa. Addendum to a biography]. The paper uses the methodology of interpretative research which emphasizes the role of meaning for the social and political construction of reality. Inspired by the theoretical and methodological proposals of discourse analysis it examines the mechanisms used to reconstruct Lech Wałęsa’s charismatic identity in response to a book that undermines his social image. These attempts also involve the construction of individual identity, in the case under analysis, the identity of historians and authors of the book who are responsible for undermining this image. Therefore, the paper also attempts to analyze media representations of S. Cenckiewicz and P. Gontarczyk. Attention is primarily focused on the key actors, on the features attributed to them and related argumentative strategies understood as a more or less intentional plan of discursive practices adopted in order to achieve defined social, political, linguistic or psychological purposes