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DTSTAMP:20260404T133038Z
UID:65e9967cb4076013762910@ist.ac.at
DTSTART:20240325T113000
DTEND:20240325T123000
DESCRIPTION:Speaker: Di Xu\nhosted by Georgios Katsaros\nAbstract: Majorana
  bound states are zero-energy modes that are created and annihilated by th
 e same operator. They are highly sought after mainly due to their non-abel
 ian statistics\, a property desirable both for fundamental research and po
 ssible applications in the field of quantum computing. Majorana zero-modes
  are necessarily spin-less\, which directs the attention of their pursuit 
 on the boundary of topological superconductors. In the so-called Lutchyn-O
 reg model\, a semiconductor nanowire coupled to a superconductor is predic
 ted to hold two Majorana zero-modes localized at the wire ends. My work ha
 d spanned two eras of utilizing InSb nanowires with epitaxial Al and InSb-
 Al selective area growth (SAG) platform [1][2]. Later\, the realization of
  a two-site Kitaev chain featuring "poor man's Majorana (PPM)" states beca
 me a recent path forward in the field of topological superconductivity [3]
 [4]. PPM is realized by two spin-polarized quantum dots in an InSb nanowir
 e strongly coupled by both elastic co-tunneling and crossed Andreev reflec
 tion. This system can be fine-tuned to a sweet spot where a pair of PPM st
 ates is predicted to appear. At this sweet spot\, the transport characteri
 stics satisfy the theoretical predictions for such a system\, including pa
 irwise correlation\, zero charge and stability against local perturbations
 . Furthermore\, to increase their robustness to external perturbations\, w
 e form a two-site Kitaev chain using proximitized quantum dots hosting Yu-
 Shiba-Rusinov states [5]. The strong hybridization between such states and
  the superconductor enables the creation of PMM states with a gap larger t
 han 70 eV. It also greatly reduces the charge dispersion compared to Kitae
 v chains made with non-proximitized quantum dots. The large gap and reduce
 d sensitivity to charge fluctuations will benefit qubit manipulation and d
 emonstration of non-abelian physics using poor man's Majorana states.1. De
  Moor*\, Bommer*\, Xu* et al. Electric eld tunable superconductor-semicond
 uctor coupling in Majorana nanowires\, New J. Phys. 20\, 103049 (2018)2. O
 p het Veld*\, Xu* et al. In-plane selective area InSbAl nanowire quantum n
 etworks\, Commun. Phys. 3\, 59 (2020)3. Wang et al. Singlet and triplet Co
 oper pair splitting in superconducting-semiconducting hybrid nanowires\, N
 ature 612\, 448453 (2022)4. Dvir et al. Realization of a minimal Kitaev ch
 ain in coupled quantum dots\, Nature 614\, 445450 (2023)5. Zatelli*\, Van 
 Driel*\, Xu* et al. Robust poor man's Majorana zero modes using Yu-Shiba-R
 usinov states. arXiv:2311.03193
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Di Xu: Towards robust Majorana modes: from Lutchyn-Oreg model to Po
 or Man's Majorana using Yu-Shiba-Rusinov states
URL:https://talks-calendar.ista.ac.at/events/4852
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