2DCC In-House Research Highlight

Project Summary: The discovery of Weyl semimetals has fueled tremendous interest in condensed-matter physics because they provide not only model platforms for studying concepts in high-energy physics but also a means of realizing technologically relevant exotic quantum states. Although Weyl semimetals have been demonstrated in several nonmagnetic and magnetic materials, one challenge in the current study of Weyl fermion physics is the lack of “ideal” Weyl semimetals.

Project Summary: Recent research on intrinsic magnetic topological insulators MnBi2Te4 sheds new light on the observation of a high-temperature quantum anomalous Hall effect (QAH) effect.

Project Summary: We report scalable growth and vanadium (V) doping of 2D WSe2 at front-end-of-line (FEOL) and back-end-of-line (BEOL) compatible temperatures of 800 °C and 400 °C, respectively.

Project Summary: Molecular insights into graphene-catalyst surface interactions can provide useful information for the efficient design of copper current collectors with graphitic anode interfaces. As graphene bending can affect the local electron density, it should reflect its local reactivity as well.

Project Summary: Dilute magnetic semiconductors, achieved through substitutional doping of magnetic atoms into semiconducting systems, enable experimental modulation of spin dynamics for novel magneto-electric or magneto-optical devices, especially in 2D transition metal dichalcogenides that accentuate interactions and activate valley degrees of freedom.

Project Summary: The rapid discovery of two-dimensional (2D) van der Waals (vdW) quantum materials has led to heterostructures that integrate diverse quantum

Project Summary: A topological insulator (TI) interfaced with an s-wave superconductor has been predicted to host topological superconductivity.

Although doping with alkali atoms is a powerful way to introduce charge carriers into 2D systems, the resulting doped materials are often not air stable. A team of 2DCC researchers and external users has designed a strategy to increase the stability of alkali-doped materials by using stoichiometrically unbalanced salt crystals with excess cations; the salt crystal acting as a template to stabilize the excess dopant atoms against oxidation.

Project Summary: Among the high-mobility two-dimensional transition metal dichalcogenides, PtSe2 is of particular interest due to its record high carrier mobility of 210 cm2/Vs, sizeable band gap and air stability to address the current nee

Project Summary: Atomic-level probing and controlling epitaxial graphene (EG) defects constitutes a key step in the