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DTSTAMP:20260404T015913Z
UID:59d4bf21eac0e614637690@ist.ac.at
DTSTART:20181030T110000
DTEND:20181030T123000
DESCRIPTION:Speaker: Ramón Aguado\nhosted by Georgios Katsaros\nAbstract: 
 An interacting quantum dot coupled to a superconducting contact is an arti
 ficial analogue of a quantum impurity in a superconductor. The physics of 
 such hybrid device is governed by the fermionic parity and spin of the two
  possible ground states\, doublet or singlet (and their corresponding Andr
 eev sub-gap excitations). After an introduction on the physics of Andreev 
 excitations in quantum dots coupled to superconductors [1-3]\, I will expl
 ain what happens when this paradigmatic model is generalised to the case w
 here the superconductor becomes topological. Such a quantum dot-topologica
 l superconductor junction can be experimentally realised by e. g. creating
  quantum dots at the end of epitaxial hybrid semiconductor-superconductor 
 nanowires. As I will argue\, the hybridisation between Andreev states in t
 he dot and Majoranas in the nanowire show specific and measurable spectral
  features that arise from the interplay of these states. Interestingly\, t
 hese features are enough to fully characterise the spin structure of the M
 ajorana wavefunction\, the degree of Majorana non-locality and the Majoran
 a splitting. Thus\, quantum dots used to perform spectroscopy of a Majoran
 a nanowire are a powerful probe into the quantum structure of Majorana bou
 nd states [4\,5] and constitute an interesting alternative to other techni
 ques for Majorana detection.[1] Eduardo J. H. Lee\, Xiaocheng Jiang\, Geor
 gios Katsaros\, Ramon Aguado\, Charles M. Lieber and Silvano De Franceschi
 \, Phys. Rev. Lett. 109\, 186802 (2012)[2] Eduardo J. H. Lee\, Xiaocheng J
 iang\, Manuel Houzet\, Ramon Aguado\, Charles M. Lieber and Silvano De Fra
 nceschi\, Nature Nanotech.\, 9\, 79-84 (2014)[3] Eduardo J. H. Lee\, Xiaoc
 heng Jiang\, Rok Zitko\, Ramon Aguado\, Charles M. Lieber and Silvano De F
 ranceschi\, Phys. Rev. B 95\, 180502 (2017)[4] E. Prada\, R. Aguado and P.
  San Jose\, Phys. Rev. B 96\, 085418 (2017)[5] M. T. Deng\, S. Vaitieknas\
 , E. Prada\, P. San-Jose\, J. Nygrd\, P. Krogstrup\, R. Aguado\, C. M. Mar
 cus\, Phys. Rev. B 98\, 085125 (2018)
LOCATION:Big Seminar room Ground floor / Office Bldg West (I21.EG.101)\, IS
 TA
ORGANIZER:jdeanton@ist.ac.at
SUMMARY:Ramón Aguado: Quantum dot physics in Majorana nanowires
URL:https://talks-calendar.ista.ac.at/events/1562
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