A van der Waals contact-bond model for low-dimensional nanoscale carbon materials based on the quasi-continuum method

2019 ◽  
Vol 34 (24) ◽  
pp. 4011-4023 ◽  
Author(s):  
Xiangyang Wang ◽  
Huibo Qi ◽  
Zhongyu Sun ◽  
Lifen Hu
Keyword(s):  
Carbon Materials ◽  
Van Der Waals ◽  
Bond Model ◽  
Low Dimensional ◽  
Image Position

Abstract

Van der Waals Epitaxy of GaSe on GaAs(111)

1994 ◽  
Vol 340 ◽  
Author(s):  
L. E. Rumaner ◽  
F.S. Ohuchi
Keyword(s):  
Lattice Mismatch ◽  
Van Der Waals ◽  
Three Dimensional ◽  
Structured Materials ◽  
Lattice Matching ◽  
Molecular Beam Deposition ◽  
Crystal Films ◽  
Low Dimensional ◽  
Matching Constraints ◽  
Lattice Matched

ABSTRACTAlthough heteroepitaxy of lattice-matched and lattice-mismatched materials leading to artificially structured materials has resulted in impressive performance in various electronics devices, material combinations are usually limited by lattice matching constraints. A new concept for fabricating material systems using the atomically abrupt and low dimensional nature of layered materials, called van der Waals epitaxy (VDWE), has been developed. GaSe (Eg = 2.1 eV) has been deposited on the three dimensional surface of GaAs (111) using a molecular beam deposition system. GaSe was evaporated from a single Knudsen source, impinging on a heated substrate. Even with a lattice mismatch of 6% between the substrate and the growing film, good quality single crystal films were grown as determined by RHEED. The films have further been analyzed using a complementary combination of XPS and X-ray reflectivity.

scholarly journals Direct Electricity Generation Mediated by Molecular Interactions with Low Dimensional Carbon Materials—A Mechanistic Perspective

2018 ◽  
Vol 8 (35) ◽  
pp. 1802212 ◽  
Author(s):  
Albert Tianxiang Liu ◽  
Ge Zhang ◽  
Anton L. Cottrill ◽  
Yuichiro Kunai ◽  
Amir Kaplan ◽  
...  
Keyword(s):  
Molecular Interactions ◽  
Electricity Generation ◽  
Carbon Materials ◽  
Low Dimensional

Impact of domain disorder on optoelectronic properties of layered semimetal MoTe2

2D Materials ◽  
2021 ◽  
Author(s):  
Maanwinder P. Singh ◽  
Jonas Kiemle ◽  
Ilkay Ozdemir ◽  
Philipp Zimmermann ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Topological Type ◽  
Optoelectronic Properties ◽  
Local Domain ◽  
Type Ii ◽  
Relaxation Dynamics ◽  
Weyl Semimetal ◽  
Ultrafast Relaxation ◽  
Low Dimensional ◽  
The Impact

Abstract We address the impact of crystal phase disorder on the generation of helicity-dependent photocurrents in layered MoTe2, which is one of the van der Waals materials to realize the topological type-II Weyl semimetal phase. Using scanning photocurrent microscopy, we spatially probe the phase transition and its hysteresis between the centrosymmetric, monoclinic 1T’ phase to the symmetry-broken, orthorhombic Td phase as a function of temperature. We find a highly disordered photocurrent response in the intermediate temperature regime. Moreover, we demonstrate that helicity-dependent and ultrafast photocurrents in MoTe2 arise most likely from a local breaking of the electronic symmetries. Our results highlight the prospects of local domain morphologies and ultrafast relaxation dynamics on the optoelectronic properties of low-dimensional van der Waals circuits.

scholarly journals Kagome van-der-Waals Pd3P2S8 with flat band

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Seunghyun Park ◽  
Soonmin Kang ◽  
Haeri Kim ◽  
Ki Hoon Lee ◽  
Pilkwang Kim ◽  
...  
Keyword(s):  
Diamagnetic Susceptibility ◽  
Van Der Waals ◽  
Localized States ◽  
Flat Band ◽  
Two Dimensional ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Localized State ◽  
Low Dimensional ◽  
Important Structure

AbstractWith the advanced investigations into low-dimensional systems, it has become essential to find materials having interesting lattices that can be exfoliated down to monolayer. One particular important structure is a kagome lattice with its potentially diverse and vibrant physics. We report a van-der-Waals kagome lattice material, Pd3P2S8, with several unique properties such as an intriguing flat band. The flat band is shown to arise from a possible compact-localized state of all five 4d orbitals of Pd. The diamagnetic susceptibility is precisely measured to support the calculated susceptibility obtained from the band structure. We further demonstrate that Pd3P2S8 can be exfoliated down to monolayer, which ultimately will allow the possible control of the localized states in this two-dimensional kagome lattice using the electric field gating.

Hard ferromagnetic van-der-Waals metal (Fe,Co)3GeTe2: a new platform for the study of low-dimensional magnetic quantum criticality

2019 ◽  
Vol 31 (50) ◽  
pp. 50LT01 ◽  
Author(s):  
Inho Hwang ◽  
Matthew J Coak ◽  
Nahyun Lee ◽  
Dong-Su Ko ◽  
Youngtek Oh ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Quantum Criticality ◽  
Low Dimensional

Knot surgery and primeness

1986 ◽  
Vol 99 (1) ◽  
pp. 89-102 ◽  
Author(s):  
Francisco González Acuña ◽  
Hamish Short
Keyword(s):  
Dehn Surgery ◽  
Connected Sum ◽  
Low Dimensional Topology ◽  
Knot Surgery ◽  
Low Dimensional ◽  
Image Position

The aim of this paper is to prove some new results towards answering the question: When does Dehn surgery on a knot give a non-prime manifold? This question has been raised on several occasions (see for instance [5] or [4]; concerning the latter see below). Recall that a 3-manifold is prime if, in any connected sum decompositionone of M1, M2 is S3. (For standard definitions of low-dimensional topology see [2] or [16].)

scholarly journals Low dimensional nanostructures of fast ion conducting lithium nitride

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Nuria Tapia-Ruiz ◽  
Alexandra G. Gordon ◽  
Catherine M. Jewell ◽  
Hannah K. Edwards ◽  
Charles W. Dunnill ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Lithium Ion ◽  
Ionic Mobility ◽  
Binary Compound ◽  
Model Material ◽  
Lithium Nitride ◽  
Energy Applications ◽  
Ion Conducting ◽  
Low Dimensional ◽  
Fast Ion

Abstract As the only stable binary compound formed between an alkali metal and nitrogen, lithium nitride possesses remarkable properties and is a model material for energy applications involving the transport of lithium ions. Following a materials design principle drawn from broad structural analogies to hexagonal graphene and boron nitride, we demonstrate that such low dimensional structures can also be formed from an s-block element and nitrogen. Both one- and two-dimensional nanostructures of lithium nitride, Li3N, can be grown despite the absence of an equivalent van der Waals gap. Lithium-ion diffusion is enhanced compared to the bulk compound, yielding materials with exceptional ionic mobility. Li3N demonstrates the conceptual assembly of ionic inorganic nanostructures from monolayers without the requirement of a van der Waals gap. Computational studies reveal an electronic structure mediated by the number of Li-N layers, with a transition from a bulk narrow-bandgap semiconductor to a metal at the nanoscale.

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