Quantum dots articles within Nature Materials

Featured

  • News & Views |

    Quantum dots couple to form artificial molecules that allow for variable colour emission in response to an electric field.

    • James Cassidy
    • , Justin Ondry
    •  & Dmitri V. Talapin

  • News & Views |

    Quantum dots are engineered to use dopant states to achieve substantially enhanced impact ionization, which is potentially useful for light-harvesting applications.

    • Miri Kazes
    •  & Dan Oron

  • Article
    | Open Access

    Carrier multiplication generates multiple excitons for each absorbed photon but is normally limited by fast phonon-assisted relaxation. Here the authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots, due to very fast spin-exchange interactions between Mn ions and the quantum dots that outpace energy losses arising from phonon emission.

    • Ho Jin
    • , Clément Livache
    •  & Victor I. Klimov

  • News & Views |

    Ensemble-level experimental evidence of exciton fine-structure splitting in perovskite quantum dots has been demonstrated, correlated to the intrinsic symmetry of these nanocrystals.

    • Gabriele Rainò
    •  & Maksym V. Kovalenko

  • Article |

    Understanding exciton dynamics in quantum dots is important for realizing their potential in optoelectronics. Here, the authors use femtosecond transient absorption microscopy to reveal ultrafast exciton transport, enhanced at larger interdot distance and taking place within hundreds of femtoseconds after generation.

    • Zhilong Zhang
    • , Jooyoung Sung
    •  & Akshay Rao

  • Article |

    Controlled synthesis of heterostructured III-V–II-VI nanocrystals shows that dipole moments formed at the core–shell interface can tune the optoelectronic properties of these nanomaterials and their performance in light-emitting devices.

    • Byeong Guk Jeong
    • , Jun Hyuk Chang
    •  & Wan Ki Bae

  • News & Views |

    A singlet-triplet hole spin qubit in a Ge quantum well is demonstrated to be fast, coherent, and compatible with operation at magnetic fields below 10 mT, opening the door to integration with superconducting technologies.

    • Floris Braakman
    •  & Pasquale Scarlino

  • Article |

    A singlet-triplet spin qubit using holes in a Ge quantum well is demonstrated, and can be operated at low magnetic fields of a few millitesla.

    • Daniel Jirovec
    • , Andrea Hofmann
    •  & Georgios Katsaros

  • Article |

    The optical properties of two species of localized interlayer excitons in a van der Waals heterostructure are shown to depend on their spin–valley–layer configuration, enabling the identification of the moiré atomic registry and offering insights for engineering quantum states in two-dimensional materials.

    • Mauro Brotons-Gisbert
    • , Hyeonjun Baek
    •  & Brian D. Gerardot

  • News & Views |

    Electrons are shown to move quickly while still presenting features typical of quantum confinement in films of mercury telluride quantum dots.

    • Uwe Kortshagen

  • Article |

    A structural investigation on the formation of 3D superlattices of colloidal PbSe quantum dots reveals a topotactic transition from the self-assembled phase of ligand-capped quantum dots to the epitaxially fused phase typical of conductive solids.

    • Alex Abelson
    • , Caroline Qian
    •  & Matt Law

  • News & Views |

    A magnetic-field-dependent spectroscopy study on single perovskite nanocrystals reveals the spectral signatures of an exciton dark state below the bright triplet states.

    • Andries Meijerink
    •  & Freddy T. Rabouw

  • Review Article |

    The droplet epitaxy technique has emerged as an alternative to the most commonly used Stranski–Krastanov for fabricating semiconductor nanostructures. This Review discusses the important aspects of droplet epitaxy quantum dots, from the growth mechanism to device application.

    • Massimo Gurioli
    • , Zhiming Wang
    •  & Stefano Sanguinetti

  • News & Views |

    Defects in mercury telluride quantum dots can be exploited to achieve amplified spontaneous emission under continuous-wave optical pumping at ultralow power levels.

    • Frank Wise

  • News & Views |

    Compositional grading of colloidal quantum dots enables electrically driven amplification of light, bringing electrically driven lasers from these materials very close.

    • Ifor Samuel

  • News & Views |

    Two independent studies provide insight on the formation of nanocrystal superlattices and their atomic alignment using real-time in situ X-ray scattering techniques.

    • Yugang Zhang
    •  & Oleg Gang

  • Article |

    Coherent population-trapping studies of a single hole spin in quantum dot field-effect devices with low charge-noise performance provide insight into the anisotropy of the hole hyperfine interaction between hole and nuclear spins.

    • Jonathan H. Prechtel
    • , Andreas V. Kuhlmann
    •  & Richard J. Warburton

  • News & Views |

    The synthesis of crystalline quantum dots epitaxially incorporated into silicon nanowires holds promise for future device applications in various areas of opto- and quantum electronics.

    • Peter Krogstrup

  • Article |

    The addition of nickel and other metal atoms in the liquid droplets that drive the vapour–liquid–solid growth of silicon nanowires leads to the formation of metal silicide nanocrystals that are epitaxially incorporated inside the nanowires.

    • F. Panciera
    • , Y.-C. Chou
    •  & F. M. Ross

  • Editorial |

    Inorganic semiconductors, organic emitters and colloidal quantum dots are pushing the LED revolution in lighting and displays.

  • Commentary |

    Organic semiconducting molecules and colloidal quantum dots both make for excellent luminescent materials. Compared with the more established solid-state light-emitting technologies, organic LEDs and quantum-dot LEDs are in their infancy, yet they offer unique properties.

    • Sebastian Reineke

  • News & Views |

    Mastering the impact of surface chemistry on the electronic properties and stability of colloidal quantum dots enables the realization of architectures with enhanced photovoltaic performance and air stability.

    • Delia J. Milliron

  • Letter |

    Fabricating low-temperature solution-processed solar cells with good power-conversion efficiency and stability in ambient conditions has proved challenging. The use of ligands that protect colloidal quantum dots from degradation in air and tune their energy levels is now shown to be a viable approach for the realization of spin-coated solar cells with very high efficiency.

    • Chia-Hao M. Chuang
    • , Patrick R. Brown
    •  & Moungi G. Bawendi

  • Editorial |

    The properties of semiconductor quantum dots can now be controlled down to the level of single electrons and spins. These solid-state 'artificial atoms' have inspired scientists to look at them as possible building blocks for realizations of quantum computers, with unexpected consequences.

    • Hugo Ribeiro
    •  & Guido Burkard

  • Commentary |

    Semiconducting quantum dots have been extensively investigated with the idea of using single spins for quantum computing. Whereas access to single electrons and their spins has become routine, the challenges posed by nuclear spins remain ever present.

    • Hugo Ribeiro
    •  & Guido Burkard

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