Evidence of topological boundary modes with topological nodal-point superconductivity

Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor

“…4Hb-TaS2 is a superconducting van der Waals material consisting of an alternate stacking of 1T-TaS2 and 1H-TaS2 layers [Fig. 1(a)], [8,9] which in their bulk form host the correlated and superconducting electronic phases, respectively. [10][11][12] During cooling down, 4Hb-TaS2 goes through two charge density wave (CDW) transitions.…”

A Gapped Phase in Semimetallic Td‐WTe2 Induced by Lithium Intercalation

“…[ 9 ] With electron doping, a charge density wave (CDW) may also emerge in WTe 2 as several 2D chalcogenides, such as TaS 2 , possess superconductivity as well as CDWs that are modulated by electron density. [ 10 ] Recent theoretical papers indeed predict that a high level of electron doping of over 10 14 e cm −2 in monolayer T d ‐WTe 2 can introduce lattice distortions and form a CDW phase, neighboring the superconducting dome at 10 13 e cm −2 . [ 11,12 ] However, no experimental reports of a CDW phase in WTe 2 are found in the literature.…”

Josephson junctions of topological nodal superconductors

“…The formation of nodal points is protected by the effective chiral symmetry for the particles moving perpendicular to the ΓM line, which results from a combination of the modified TR symmetry T and particle-hole symmetry. The nodal phase is expected to be accompanied by Majorana flat bands along the armchair edges [33,34], experimental indications of which have been reported in [22,35].…”

“…Some of these few-layered systems remain superconducting down to the monolayer limit [3][4][5][6][7][8][9][10]. Such TMD-based systems have been proposed as a platform for controlled studies of intrinsic or externally-induced unconventional superconductivity [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”