Abstract:
:The advent of two-dimensional (2D) materials has led to extensive studies of heterostructures for novel applications. 2D lateral multiheterojunctions and superlattices have been recently demonstrated, but the available growth methods can only produce features with widths in the micrometer or, at best, 100-nm scale and usually result in rough and defective interfaces with extensive chemical intermixing. Widths smaller than 5 nm, which are needed for quantum confinement effects and quantum-well applications, have not been achieved. We demonstrate the growth of sub-2-nm quantum-well arrays in semiconductor monolayers, driven by the climb of misfit dislocations in a lattice-mismatched sulfide/selenide heterointerface. Density functional theory calculations provide an atom-by-atom description of the growth mechanism. The calculated energy bands reveal type II alignment suitable for quantum wells, suggesting that the structure could, in principle, be turned into a "conduit" of conductive nanoribbons for interconnects in future 2D integrated circuits via n-type modulation doping. This misfit dislocation-driven growth can be applied to different combinations of 2D monolayers with lattice mismatch, paving the way to a wide range of 2D quantum-well superlattices with controllable band alignment and nanoscale width.
journal_name
Sci Advjournal_title
Science advancesauthors
Zhou W,Zhang YY,Chen J,Li D,Zhou J,Liu Z,Chisholm MF,Pantelides ST,Loh KPdoi
10.1126/sciadv.aap9096subject
Has Abstractpub_date
2018-03-23 00:00:00pages
eaap9096issue
3issn
2375-2548pii
aap9096journal_volume
4pub_type
杂志文章相关文献
Science Advances文献大全abstract::A growing body of empirical evidence is revealing the value of nature experience for mental health. With rapid urbanization and declines in human contact with nature globally, crucial decisions must be made about how to preserve and enhance opportunities for nature experience. Here, we first provide points of consensu...
journal_title:Science advances
pub_type: 杂志文章,评审
doi:10.1126/sciadv.aax0903
更新日期:2019-07-24 00:00:00
abstract::Natively paired sequencing (NPS) of B cell receptors [variable heavy (VH) and light (VL)] and T cell receptors (TCRb and TCRa) is essential for the understanding of adaptive immunity in health and disease. Despite many recent technical advances, determining the VH:VL or TCRb:a repertoire with high accuracy and through...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay9093
更新日期:2020-04-22 00:00:00
abstract::Adoptive cell transfers have emerged as a disruptive approach to treat disease in a manner that is more specific than using small-molecule drugs; however, unlike traditional drugs, cells are living entities that can alter their function in response to environmental cues. In the present study, we report an engineered p...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaz6579
更新日期:2020-04-29 00:00:00
abstract::Transistors with exfoliated two-dimensional (2D) materials on a SiO2/Si substrate have been applied and have been proven effective in a wide range of applications, such as circuits, memory, photodetectors, gas sensors, optical modulators, valleytronics, and spintronics. However, these devices usually suffer from limit...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1602246
更新日期:2017-05-19 00:00:00
abstract::The fabrication of three-dimensional (3D) objects by polymer self-assembly in solution is extremely challenging. Here, multi-tori mesostructures were obtained from the crystallization-driven self-assembly of a coil-crystalline block copolymer (BCP) in mixed solvents. The formation of these structures follows a multist...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaz7301
更新日期:2020-04-15 00:00:00
abstract::The social bond between parents and offspring is characterized by coadaptation and balance between altruistic and selfish tendencies. However, its underlying genetic mechanism remains poorly understood. Using transcriptomic screens in the subsocial European earwig, Forficula auricularia, we found the expression of mor...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaw0070
更新日期:2020-01-03 00:00:00
abstract::Earthquakes in the continental crust commonly occur in the upper 15 to 20 km. Recent studies demonstrate that earthquakes also occur in the lower crust of collision zones and play a key role in metamorphic processes that modify its physical properties. However, details of the failure process and sequence of events tha...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaw0913
更新日期:2019-07-31 00:00:00
abstract::Ants (Hymenoptera: Formicidae) are diverse and ubiquitous, and their ability to sting is familiar to many of us. However, their venoms remain largely unstudied. We provide the first comprehensive characterization of a polypeptidic ant venom, that of the giant red bull ant, Myrmecia gulosa. We reveal a suite of novel p...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aau4640
更新日期:2018-09-12 00:00:00
abstract::Two-dimensional (2D) semiconductors have shown great potential for electronic and optoelectronic applications. However, their development is limited by a large Schottky barrier (SB) at the metal-semiconductor junction (MSJ), which is difficult to tune by using conventional metals because of the effect of strong Fermi ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1600069
更新日期:2016-04-22 00:00:00
abstract::The concept of repair is widely used by nature to heal molecules such as proteins, lipids, sugars, and DNA that are damaged by hydrogen atom abstraction resulting from oxidative stress. We show that this strategy, rather undocumented in the field of synthetic organic chemistry, can be used in a radical chain reaction ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aat6031
更新日期:2018-07-20 00:00:00
abstract::Membrane proteins must balance the sequence constraints associated with folding and function against the hydrophobicity required for solvation within the bilayer. We recently found the expression and maturation of rhodopsin are limited by the hydrophobicity of its seventh transmembrane domain (TM7), which contains pol...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay7505
更新日期:2020-03-04 00:00:00
abstract::Lake evaporation can influence basin-wide hydrological cycles and is an important factor in loss of water resources in endorheic lakes of the Tibetan Plateau. Because of the scarcity of data, published lake evaporation values are inconsistent, and their spatial distribution has never been reported. Presenting a plausi...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay8558
更新日期:2020-06-26 00:00:00
abstract::The impact of the FMR1 premutation on human health is the subject of considerable controversy. A fundamental unanswered question is whether carrying the premutation allele is directly correlated with clinical phenotypes. A challenging problem in past genotype-phenotype studies of the FMR1 premutation is ascertainment ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaw7195
更新日期:2019-08-21 00:00:00
abstract::The outbreak of the highly contagious and deadly severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), also known as coronavirus disease 2019 (COVID-19), has posed a serious threat to public health across the globe, calling for the development of effective diagnostic markers and therapeutics. Here, we report a...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abc1564
更新日期:2020-07-31 00:00:00
abstract::Fluid catalytic cracking (FCC) particles account for 40 to 45% of worldwide gasoline production. The hierarchical complex particle pore structure allows access of long-chain feedstock molecules into active catalyst domains where they are cracked into smaller, more valuable hydrocarbon products (for example, gasoline)....
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1400199
更新日期:2015-04-03 00:00:00
abstract::An immense demand in biomedical imaging is to develop efficient photoluminescent probes with high biocompatibility and quantum yield, as well as multiphoton absorption performance to improve penetration depth and spatial resolution. Here, iron selenide (FeSe) quantum dots (QDs) are reported to meet these criteria. The...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay0044
更新日期:2019-12-06 00:00:00
abstract::A major challenge in modern physics is to accurately describe strongly interacting quantum many-body systems. One-dimensional systems provide fundamental insights because they are often amenable to exact methods. However, no exact solution is known for the experimentally relevant case of external confinement. We propo...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1500197
更新日期:2015-07-24 00:00:00
abstract::Massive declines in population abundances of marine animals have been documented over century-long time scales. However, analogous loss of spatial extent of habitat-forming organisms is less well known because georeferenced data are rare over long time scales, particularly in subtidal, tropical marine regions. We use ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1603155
更新日期:2017-09-06 00:00:00
abstract::Dewetting is a ubiquitous phenomenon in nature; many different thin films of organic and inorganic substances (such as liquids, polymers, metals, and semiconductors) share this shape instability driven by surface tension and mass transport. Via templated solid-state dewetting, we frame complex nanoarchitectures of mon...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aao1472
更新日期:2017-11-10 00:00:00
abstract::Yearly, a quarter billion people are infected and a half a million killed by the mosquito-borne disease malaria. Lack of real-time observational tools for continuously assessing the unperturbed mosquito flight activity in situ limits progress toward improved vector control. We deployed a high-resolution entomological ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aay5487
更新日期:2020-05-13 00:00:00
abstract::Tumor angiogenesis provides critical nutrients for cancer progression and may also facilitate pathways for dissemination during the process of metastasis. It is well established that cells that metastasize display characteristics of stem cells; however, the prevailing paradigm points to these stem-like cells residing ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1701350
更新日期:2017-10-25 00:00:00
abstract::Immune regulatory metabolites are key features of the tumor microenvironment (TME), yet with a few exceptions, their identities remain largely unknown. Here, we profiled tumor and T cells from tumor and ascites of patients with high-grade serous carcinoma (HGSC) to uncover the metabolomes of these distinct TME compart...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abe1174
更新日期:2021-01-20 00:00:00
abstract::RNA interference (RNAi) technology can specifically silence the expression of a target gene and has emerged as a promising therapeutic method to treat cancer. In the present study, we showed that natural halloysite nanotube (HNT)-assisted delivery of an active small interfering RNA (siRNA) targeting receptor-interacti...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aaw6499
更新日期:2019-09-25 00:00:00
abstract::Detecting associations between genomic changes and phenotypic differences is fundamental to understanding how phenotypes evolved. By systematically screening for parallel amino acid substitutions, we detected known as well as novel cases (Strc, Tecta, and Cabp2) of parallelism between echolocating bats and toothed wha...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aat9660
更新日期:2018-09-26 00:00:00
abstract::At a time of heightened anxiety surrounding immigration, state governments have increasingly sought to manage immigrant and refugee flows. Yet the factors that influence where immigrants choose to settle after arrival remain unclear. We bring evidence to this question by analyzing population-level data for refugees re...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abb0295
更新日期:2020-08-07 00:00:00
abstract::Mineralization is the most fundamental process in vertebrates. It is predominantly mediated by osteoblasts, which secrete mineral precursors, most likely through matrix vesicles (MVs). These vesicular structures are calcium and phosphate rich and contain organic material such as acidic proteins. However, it remains la...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aax0672
更新日期:2019-07-03 00:00:00
abstract::Developing cost-effective, active, and durable electrocatalysts is one of the most important issues for the commercialization of fuel cells. Ultrathin Pt-Mo-Ni nanowires (NWs) with a diameter of ~2.5 nm and lengths of up to several micrometers were synthesized via a H2-assisted solution route (HASR). This catalyst was...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.1603068
更新日期:2017-08-30 00:00:00
abstract::Many animals understand numbers at a basic level for use in essential tasks such as foraging, shoaling, and resource management. However, complex arithmetic operations, such as addition and subtraction, using symbols and/or labeling have only been demonstrated in a limited number of nonhuman vertebrates. We show that ...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aav0961
更新日期:2019-02-06 00:00:00
abstract::Transplanting beneficial bacteria to the gut microbiome can positively modulate the bacterial composition and remains of great interest in prevention and treatment. However, environmental assaults and rapid transit times in the gastrointestinal (GI) tract result in low oral bioavailability and limited intestinal colon...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.abb1952
更新日期:2020-06-24 00:00:00
abstract::Rising temperatures in the Arctic Ocean region are responsible for changes such as reduced ice cover, permafrost thawing, and increased river discharge, which, together, alter nutrient and carbon cycles over the vast Arctic continental shelf. We show that the concentration of radium-228, sourced to seawater through se...
journal_title:Science advances
pub_type: 杂志文章
doi:10.1126/sciadv.aao1302
更新日期:2018-01-03 00:00:00