Opportunities and Challenges in Twisted Bilayer Graphene: A Review

Abstract

HIGHLIGHTS • This article presents an overview of twisted bilayer graphene (tBLG) on their fabrication techniques and twisting angle-dependent properties. • The properties of tBLG can be controlled by controlling the twisting angle between two graphene sheets. ABSTRACT Two-dimensional (2D) materials exhibit enhanced physical, chemical, electronic, and optical properties when compared to those of bulk materials. Graphene demands significant attention due to its superior physical and electronic characteristics among different types of 2D materials. The bilayer graphene is fabricated by the stacking of the two monolayers of graphene. The twisted bilayer graphene (tBLG) superlattice is formed when these layers are twisted at a small angle. The presence of disorders and interlayer interactions in tBLG enhances several characteristics, including the optical and electrical properties. The studies on twisted bilayer graphene have been exciting and challenging thus far, especially after superconductivity was reported in tBLG at the magic angle. This article reviews the current progress in the fabrication techniques of twisted bilayer graphene and its twisting angle-dependent properties. Optical absorption Chemical reactivity S u p e r c o n d u c t iv it y v a n H o v e s in g u la r it ie s Gb a n d r e s o n a n c e In t e r la y e r c o u p li n g

Cyclophane with eclipsed pyrene units enables construction of spin interfaces with chemical accuracy

“…S7 and S8 †). 50 The intramolecular spacing between the consensus planes of the pyrene groups is 351.64 (15) pm, and these planes have bending angles 30 of just 3.8(4) . The pyrene groups are offset by only $50 pm from perfectly eclipsed.…”

“…[10][11][12][13] Superconductivity arises in a duplex of two graphene sheets if one is twisted by a "magic angle" ($1.1 ) with respect to the other. 14,15 These uncommon electronic properties arise because atoms at interfaces have been arranged in precise congurations that are challenging to achieve.…”

Fermi Velocity Reduction of Dirac Fermions around the Brillouin Zone Center in In2Se3–Bilayer Graphene Heterostructures

“…This fact leaves the fine electronic structure of magic-angle TBG [1][2] unexplored, despite many theoretical speculations on the origin of the related exotic phenomena (for a review, see ref. [11]).…”

Fabrication Strategies of Twisted Bilayer Graphenes and Their Unique Properties

“…In short, great progress on tBLG has been achieved by numerous excellent studies in recent years. Although a few reviews on its physical properties have been reported, [35][36][37] the systematical introduction and summary for the fabrication challenges and preparation strategies of tBLG, characterization methods of twist angle, and their unique physicochemical properties is still lacking. Herein, we describe the cutting-edge preparation methods of tBLG and analyze their features and drawbacks to disclose the influence in properties and application of tBLG.…”