Spin Dependent Conductance of a Quantum Dot Side attached to Topological Superconductors as a Probe of Majorana Fermion States

• Authors: D. Krychowski , S. Lipiński , G. Cuniberti
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

72.10.Fk; 73.63.Kv; 74.45.+c; 85.35.Gv

Discipline

• 72.10.Fk: Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
• 85.35.Gv: Single electron devices
• 73.63.Kv: Quantum dots
• 74.45.+c: Proximity effects; Andreev reflection; SN and SNS junctions

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 3
• Pages: 552-554

Dates

published

2018-03

Contributors

author

D. Krychowski

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

S. Lipiński

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

G. Cuniberti

• Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany

References

• [1] M. Leijnse, K. Flensberg, Phys. Rev. B 86, 104511 (2012), doi: 10.1103/PhysRevB.86.134528
• [2] S. Das Sarma, M. Freedman, C. Nayak, NPJ Quant. Inform. 1, 15001 (2015), doi: 10.1038/npjqi.2015.1
• [3] V. Mourik, K. Zuo, S.M. Vrolov, S.R. Plissard, E.P.A.M. Bakkers, L.P. Kouwenhoven, Science 336, 1003 (2012), doi: 10.1126/science.1222360
• [4] J.D. Sau, S. Tewari, Phys. Rev. B 88, 054503 (2013), doi: 10.1103/PhysRevB.88.054503
• [5] M. Lee, J.-S. Lim, H. Khim, R. López, Phys. Rev. B 87, 241402(R) (2012), doi: 10.1103/PhysRevB.87.241402
• [6] P. Stefański, Acta Phys. Pol. A 127, 198 (2015), doi: 10.12693/APhysPolA.127.198
• [7] D. Sticlet, C. Bena, P. Simon, Phys. Rev. Lett. 108, 096802 (2012), doi: 10.1103/PhysRevLett.108.096802
• [8] G. Kotliar, A. E. Ruckenstein, Phys. Rev. Lett. 57, 1362 (1986), doi: 10.1103/PhysRevLett.57.1362

Identifiers

DOI

10.12693/APhysPolA.133.552