Evidence of topological boundary modes with topological nodal-point superconductivity

Abhay Kumar Nayak, Aviram Steinbok, Yotam Roet, Jahyun Koo, Gilad Margalit, Irena Feldman, Avior Almoalem, Amit Kanigel, Gregory A Fiete, Binghai Yan, Yuval Oreg, Nurit Avraham, Haim Beidenkopf

نتاج البحث: نشر في مجلةمقالةمراجعة النظراء


Topological superconductors are an essential component for topologically protected quantum computation and information processing. Although signatures of topological superconductivity have been reported in heterostructures, material realizations of intrinsic topological superconductors are rather rare. Here we use scanning tunnelling spectroscopy to study the transition metal dichalcogenide 4Hb-TaS2 that interleaves superconducting 1H-TaS2 layers with strongly correlated 1T-TaS2 layers, and find spectroscopic evidence for the existence of topological surface superconductivity. These include edge modes running along the 1H-layer terminations as well as under the 1T-layer terminations, where they separate between superconducting regions of distinct topological nature. We also observe signatures of zero-bias states in vortex cores. All the boundary modes exhibit crystallographic anisotropy, which—together with a finite in-gap density of states throughout the 1H layers—allude to the presence of a topological nodal-point superconducting state. Our theoretical modelling attributes this phenomenology to an inter-orbital pairing channel that necessitates the combination of surface mirror symmetry breaking and strong interactions. It, thus, suggests a topological superconducting state realized in a natural compound.
اللغة الأصليةالإنجليزيّة
الصفحات (من إلى)1413-1419
عدد الصفحات7
دوريةNature Physics
مستوى الصوت17
رقم الإصدار12
المعرِّفات الرقمية للأشياء
حالة النشرنُشِر - ديسمبر 2021

All Science Journal Classification (ASJC) codes

  • !!General Physics and Astronomy


أدرس بدقة موضوعات البحث “Evidence of topological boundary modes with topological nodal-point superconductivity'. فهما يشكلان معًا بصمة فريدة.

قم بذكر هذا