Recent progresses of quantum confinement in graphene quantum dots

Abstract

Graphene quantum dots (GQDs) not only have potential applications on spin qubit,but also serve as essential platforms to study the fundamental properties of Dirac fermions, such as Klein tunneling and Berry phase. By now, the study of quantum confinement in GQDs still attract much attention in condensed matter physics. In this article, we review the experimental progresses on quantum confinement in GQDs mainly by using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). Here, the GQDs are divided into Klein GQDs, bound-state GQDs and edge-terminated GQDs according to their different confinement strength. Based on the realization of quasi-bound states in Klein GQDs, external perpendicular magnetic field is utilized as a manipulation approach to trigger and control the novel properties by tuning Berry phase and electron-electron (e-e) interaction. The tip induced edge-free GQDs can serve as an intuitive mean to explore the broken symmetry states at nanoscale and single-electron accuracy, which are expected to be used in studying physical properties of different two-dimentional materials. Moreover, high-spin magnetic ground states are successfully introduced in edge-terminated GQDs by designing and synthesizing triangulene zigzag nanographenes.

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Cited by in corpus (13)

• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Magnetic field-tunable valley-contrasting pseudomagnetic confinement in graphene
• A Lévy flight for electrons in graphene: superdiffusive-to-diffusive transport transition
• Zigzag edge ferromagnetism of triangular-graphene-quantum-dot-like system
• Dirac fermions in armchair graphene nanoribbons trapped by electric quantum dots
• Valley-dependent transport through graphene quantum dots due to proximity-induced, staggered spin-orbit couplings
• SUSY design of smooth quantum rings in graphene
• Electronic analogue of Fourier optics with mass-less Dirac fermions scattered by quantum dot lattice
• Lorentzian quantum wells in graphene: the role of shape invariance in zero-energy states trapping
• Tuning the electronic and optical properties of hg-C${}_3$N${}_4$, quantum dots with edge-functionalization: A computational perspective
• Atomic collapse of high-order singular potentials in graphene
• Quantum Monte Carlo study of artificial triangular graphene quantum dots
• Probing Quantum Geometric Phases via Scanning Tunneling Microscopy