ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT ttk.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

márc. 21 péntek 10h15,
1111 Bp., Budafoki út 8., BME FIII. magasföldszint 1, szemináriumi szoba

Anirban Das (BME Elm. Fiz. tanszék):
Role of interface hybridization on induced superconductivity in 1T
′-WTe2 and 2H-NbSe2 heterostructures

Heterostructures between two-dimensional quantum spin Hall insulators
(QSHIs) and superconducting materials can allow for the presence of
Majorana fermions at their conducting edge states. Although a strong
interface hybridization helps induce a reasonable superconducting gap
on the topological material, the hybridization can modify the
material’s electronic structure. In this work, we utilize a realistic
low-energy model with tunable interlayer hybridization to study the
edge-state physics in a heterostructure between monolayer quantum spin
Hall insulator 1T ′-WTe2 and s-wave superconductor 2H-NbSe2. We find
that even in the presence of strong interlayer hybridization that
renders the surface to become conducting, the edge state shows a
significantly enhanced local density of states and induced
superconductivity compared to the surface. We provide an alternate
heterostructure geometry that can utilize the strong interlayer
hybridization and realize a spatial interface between a regime with a
clean QSHI gap and a topological conducting edge state.

References:
A. Das, B. Weber, & S. Mukherjee (2023). Role of interface
hybridization on induced superconductivity in 1 T′-WTe 2 and 2 H-NbSe
2 heterostructures. Physical Review B, 108(7), 075410.
Tao,  et al. "Multiband superconductivity in strongly hybridized 1
T′-WTe 2/NbSe 2 heterostructures." Physical Review B 105.9 (2022):
094512.

Minden érdeklődőt szeretettel várunk.
Asbóth János,
 szemináriumi koordinátor