About this Research Topic
Since the successful discovery and isolation of graphene in 2004, the field of two-dimensional (2D) materials and research on the discovery, characterization, and application of novel 2D materials has grown exponentially. In 2D materials, each layer is composed of a covalently bonded lattice and is weakly coupled to its neighboring layers by van der Waals interactions. Plenty of 2D materials have been synthesized or theoretically predicted, including boron nitride, silicene, germanene, phosphorene, transition metal dichalcogenides (TMDs), and arsenene. The quantum confinement effect and reduced screening effect arising from thickness reduction in 2D materials often manifest themselves in features clearly different from those of their bulk counterparts. Due to the unique physical such as layered-dependent physical properties, high electrical, thermal conductance, and stiffness, the 2D materials not only have promising applications in electronics, magnetic, optoelectronics, piezoelectronics, ferroelectricity, thermoelectrics, twistronics, valleytronics, spintronics, superconductivity, and many others but also provide rich and ideal research platforms for studying quantum confinement effects.
This Research Topic aims to publish Original Research papers studying the latest advances in quantum confinement effects of 2D materials, carried out with complementary experimental and theoretical techniques. These range from electronic structure to electronic polarization and transport. A few glorious examples of systems such as a linear dispersion relation near the Dirac point in graphene, indirect-direct-gap transition of MoS2 when the thickness decreased from bulk to single-layer limit, layer-dependent band gap in few-layer phosphorene. This Research Topic aims to cover the current state of this exciting research field, with a particular focus on properties including but not limited to quantum confinement effects of 2D materials, covering a wide range of topics:
• New quantum confinement effects including but not limited to layer-dependent evaluations of 2D pristine materials, heterojunction and moiré superlattices in electronics, optoelectronics, piezoelectronics, twistronics, valleytronics, spintronics, superconductivity, thermoelectrics, piezoelectrics, ferroelectrics;
• New phenomena in 2D materials including Berry curvature, valley hall effect, quantum spin Hall effect, quantum transport;
• Computational design of 2D materials by using first-principles calculations, machine learning and high throughput screening;
• Defects, doping, alloying and their role in functionalizing 2D materials;
• Tunable electronic properties of 2D materials by size control, strain engineering, and electric field modulation.
Keywords: Two-dimensional materials, Layer-dependent electronic structure, Quantum confinement effect
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