INMA Junior: Rubén Gracia

Next Thursday, 11th May, at 11:45 a.m. the next INMA-Junior Seminar will take place in the Aula of the R+D Building of the Río Ebro Campus. After the seminar there will be a

snack to which all attendees will be able to attend.

INMA-JUNIOR SEMINAR:

Date and time: Thursday 11 May at 11:45 am.

Speaker: Rubén Gracia Abad

Title: SUPERCONDUCTING DEVICES BASED ON Bi2Se3 JUNCTIONS

Summary of the talk: Topological insulators are materials with an insulating bulk and metallic surface states protected by time reversal symmetry. In particular, Bi₂Se₃ has attracted much attention due to its simplicity and its relatively large band gap. These materials can be combined with superconductors to create hybrid devices presenting unconventional effects not observed in standard superconductor devices. Here, we explore the properties of hybrid superconductor devices combining Bi₂Se₃ and type-II superconductor WC fabricated by Focused Ion Beam (FIB)-related techniques. The electrical characterization of these devices shows that the superconductivity is induced in the topological insulator, presenting coherent transport through the Bi₂Se₃ junctions, which leads to a large modulation of the superconducting properties with complex features. Further modification of the device by FIB results in the suppression of this behaviour and seems to indicate that it was originated as an interference of two coherent channels, one coming from the bulk and the other one coming from the surface states.