Bottom-Up Growth of Monolayer Honeycomb SiC
Artikel i vetenskaplig tidskrift, 2023

The long theorized two-dimensional allotrope of SiC has remained elusive amid the exploration of graphenelike honeycomb structured monolayers. It is anticipated to possess a large direct band gap (2.5 eV), ambient stability, and chemical versatility. While sp2 bonding between silicon and carbon is energetically favorable, only disordered nanoflakes have been reported to date. Here we demonstrate large-area, bottom-up synthesis of monocrystalline, epitaxial monolayer honeycomb SiC atop ultrathin transition metal carbide films on SiC substrates. We find the 2D phase of SiC to be almost planar and stable at high temperatures, up to 1200 °C in vacuum. Interactions between the 2D-SiC and the transition metal carbide surface result in a Dirac-like feature in the electronic band structure, which in the case of a TaC substrate is strongly spin-split. Our findings represent the first step towards routine and tailored synthesis of 2D-SiC monolayers, and this novel heteroepitaxial system may find diverse applications ranging from photovoltaics to topological superconductivity.


Craig Michael Polley

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Max IV-laboratoriet

H. Fedderwitz

Max IV-laboratoriet

T. Balasubramanian

Max IV-laboratoriet

A. A. Zakharov

Max IV-laboratoriet

Rositsa Yakimova

Linköpings universitet

Olof Bäcke

Chalmers, Fysik, Mikrostrukturfysik

Jenny Ekman

Chalmers, Mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

Samuel Lara Avila

Chalmers, Mikroteknologi och nanovetenskap, Kvantkomponentfysik

National Physical Laboratory (NPL)

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 130 7 076203

Nya tvådimensionella system från tillväxt till tillämpningar

Stiftelsen för Strategisk forskning (SSF) (RMA15-0024), 2016-05-01 -- 2021-06-30.

Epitaxiell grafen för metrologi, sensorer och elektronik

Stiftelsen för Strategisk forskning (SSF) (GMT14-0077), 2016-01-01 -- 2020-12-31.

Kvantkriticitet och ny kvantmateria i tvådimensionella Dirac-material

Vetenskapsrådet (VR) (2021-05252), 2022-01-01 -- 2025-12-31.

2D material-baserad teknologi för industriella applikationer (2D-TECH)

GKN Aerospace Sweden (2D-tech), 2021-01-01 -- 2024-12-31.

VINNOVA (2019-00068), 2020-05-01 -- 2024-12-31.


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