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 2D Materials   [SJR: 4.344]   [H-I: 8]   [11 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Online) 2053-1583    Published by IOP  [71 journals]
• Valley-selective topologically ordered states in irradiated bilayer
graphene
• Authors: Chunlei Qu; Chuanwei Zhang Fan Zhang
First page: 011005
Abstract: Gapless bilayer graphene is susceptible to a variety of spontaneously gapped states. As predicted by theory and observed by experiment, the ground state is, however, topologically trivial, because a valley-independent gap is energetically favorable. Here, we show that under the application of interlayer electric field and circularly polarized light, one valley can be selected to exhibit the original interaction instability while the other is frozen out. Tuning this Floquet system stabilizes multiple competing topologically ordered states, distinguishable by edge transport and circular dichroism. Notably, quantized charge, spin, and valley Hall conductivities coexist in one stabilized state.
Citation: 2D Materials
PubDate: 2017-11-06T00:00:00Z
DOI: 10.1088/2053-1583/aa9471
Issue No: Vol. 5, No. 1 (2017)

• Graphene hot-electron light bulb: incandescence from hBN-encapsulated
graphene in air
• Authors: Seok-Kyun Son; Makars Šiškins, Ciaran Mullan, Jun Yin, Vasyl G Kravets, Aleksey Kozikov, Servet Ozdemir, Manal Alhazmi, Matthew Holwill, Kenji Watanabe, Takashi Taniguchi, Davit Ghazaryan, Kostya S Novoselov, Vladimir I Fal’ko Artem Mishchenko
First page: 011006
Abstract: The excellent electronic and mechanical properties of graphene allow it to sustain very large currents, enabling its incandescence through Joule heating in suspended devices. Although interesting scientifically and promising technologically, this process is unattainable in ambient environment, because graphene quickly oxidises at high temperatures. Here, we take the performance of graphene-based incandescent devices to the next level by encapsulating graphene with hexagonal boron nitride (hBN). Remarkably, we found that the hBN encapsulation provides an excellent protection for hot graphene filaments even at temperatures well above 2000 K. Unrivalled oxidation resistance of hBN combined with atomically clean graphene/hBN interface allows for a stable light emission from our devices in atmosphere for many hours of continuous operation. Furthermore, when confined in a simple photonic cavity, the thermal emission spectrum is modified by a cavity mode, shifting the emission to the v...
Citation: 2D Materials
PubDate: 2017-11-08T00:00:00Z
DOI: 10.1088/2053-1583/aa97b5
Issue No: Vol. 5, No. 1 (2017)

• Robust valley polarization of helium ion modified atomically thin MoS 2
• Authors: J Klein; A Kuc, A Nolinder, M Altzschner, J Wierzbowski, F Sigger, F Kreupl, J J Finley, U Wurstbauer, A W Holleitner M Kaniber
First page: 011007
Abstract: Atomically thin semiconductors have dimensions that are commensurate with critical feature sizes of future optoelectronic devices defined using electron/ion beam lithography. Robustness of their emergent optical and valleytronic properties is essential for typical exposure doses used during fabrication. Here, we explore how focused helium ion bombardement affects the intrinsic vibrational, luminescence and valleytronic properties of atomically thin ##IMG## [http://ej.iop.org/images/2053-1583/5/1/011007/tdmaa9642ieqn001.gif] {${\rm MoS}_{2}$} . By probing the disorder dependent vibrational response we deduce the interdefect distance by applying a phonon confinement model. We show that the increasing interdefect distance correlates with disorder-related luminscence arising 180 meV below the neutral exciton emission. We perform ab initio density functional theory of a variety of defect related morphologies, which yield first indications on the origin of...
Citation: 2D Materials
PubDate: 2017-11-09T00:00:00Z
DOI: 10.1088/2053-1583/aa9642
Issue No: Vol. 5, No. 1 (2017)

• Uncooled EuSbTe 3 photodetector highly sensitive from ultraviolet to
terahertz frequencies
• Authors: Ying Y Niu; Dong Wu, Yu Q Su, Hai Zhu, Biao Wang, Ying X Wang, Zi R Zhao, Ping Zheng, Jia S Niu, Hui B Zhou, Jian Wei Nan L Wang
First page: 011008
Abstract: Light probe from Uv to THz is critical in photoelectronics and has great applications ranging from imaging, communication to medicine (Woodward et al 2002 Phys. Med. Biol . 47 3853–63; Pospischil et al 2013 Nat. Photon . 7 892–6; Martyniuk and Rogalski 2003 Prog. Quantum Electron . 27 59–210). However, the room temperature ultrabroadband photodetection across visible down to far-infrared is still challenging. The challenging arises mainly from the lack of suitable photoactive materials. Because that conventional semiconductors, such as silicon, have their photosensitive properties cut off by the bandgap and are transparent to spectrum at long-wavelength infrared side (Ciupa and Rogalski 1997 Opto-Electron. Rev . 5 257–66; Tonouchi 2007 Nat. Photon . 1 97–105; Sizov and Rogalski 2010 Prog. Quantum Electron . 34 278–347; Kinch 2000 J. Electron. Mater . 29 809–17). Comparatively...
Citation: 2D Materials
PubDate: 2017-11-10T00:00:00Z
DOI: 10.1088/2053-1583/aa939c
Issue No: Vol. 5, No. 1 (2017)

• In situ crystallization kinetics of two-dimensional MoS 2
• Authors: Rafael A Vilá; Rahul Rao, Christopher Muratore, Elisabeth Bianco, Joshua A Robinson, Benji Maruyama Nicholas R Glavin
First page: 011009
Abstract: Developing effective strategies to synthesize 2D materials such as molybdenum disulfide (MoS 2 ) necessitates a fundamental understanding of the thermodynamics and kinetics controlling the nucleation and growth processes. Studying crystallization kinetics of MoS 2 with conventional synthesis methods, such as chemical vapor deposition, is challenging because there is a complex set of thermally-activated events happening simultaneously. By combining high-throughput experimentation with in situ Raman spectroscopy we show that the migration-limited crystallization kinetics of MoS 2 can be directly observed. During isothermal heating we find that nucleation of MoS 2 happens rapidly and that the crystallization rate follows an Arrhenius temperature relationship, yielding an energy barrier of 1.03 eV/atom. The relationship between temperature, crystal quality, and layer orientation is determined with transmission electron microscopy and Ram...
Citation: 2D Materials
PubDate: 2017-11-13T00:00:00Z
DOI: 10.1088/2053-1583/aa9674
Issue No: Vol. 5, No. 1 (2017)

• Evaluating arbitrary strain configurations and doping in graphene with
Raman spectroscopy
• Authors: Niclas S Mueller; Sebastian Heeg, Miriam Peña Alvarez, Patryk Kusch, Sören Wasserroth, Nick Clark, Fredrik Schedin, John Parthenios, Konstantinos Papagelis, Costas Galiotis, Martin Kalbáč, Aravind Vijayaraghavan, Uwe Huebner, Roman Gorbachev, Otakar Frank Stephanie Reich
First page: 015016
Abstract: The properties of graphene depend sensitively on strain and doping affecting its behavior in devices and allowing an advanced tailoring of this material. A knowledge of the strain configuration, i.e. the relative magnitude of the components of the strain tensor, is particularly crucial, because it governs effects like band-gap opening, pseudo-magnetic fields, and induced superconductivity. It also enters critically in the analysis of the doping level. We propose a method for evaluating unknown strain configurations and simultaneous doping in graphene using Raman spectroscopy. In our analysis we first extract the bare peak shift of the G and 2D modes by eliminating their splitting due to shear strain. The shifts from hydrostatic strain and doping are separated by a correlation analysis of the 2D and G frequencies, where we find ##IMG## [http://ej.iop.org/images/2053-1583/5/1/015016/tdmaa90b3ieqn...] {$\Delta \omega_{\rm 2D}/\Delta \omega_{\rm G} = 2.21 \pm 0.05$}
Citation: 2D Materials
PubDate: 2017-11-06T00:00:00Z
DOI: 10.1088/2053-1583/aa90b3
Issue No: Vol. 5, No. 1 (2017)

• Magnetic field dependence of the atomic collapse state in graphene
• Authors: D Moldovan; M Ramezani Masir F M Peeters
First page: 015017
Abstract: Quantum electrodynamics predicts that heavy atoms ( ##IMG## [http://ej.iop.org/images/2053-1583/5/1/015017/tdmaa9647ieqn001.gif] {$Z> Z_c \approx 170$} ) will undergo the process of atomic collapse where electrons sink into the positron continuum and a new family of so-called collapsing states emerges. The relativistic electrons in graphene exhibit the same physics but at a much lower critical charge ( ##IMG## [http://ej.iop.org/images/2053-1583/5/1/015017/tdmaa9647ieqn002.gif] {$Z_c \approx 1$} ) which has made it possible to confirm this phenomenon experimentally. However, there exist conflicting predictions on the effect of a magnetic field on atomic collapse. These theoretical predictions are based on the continuum Dirac–Weyl equation, which does not have an exact analytical solution for the interplay of a supercritical Coulomb potential and the magnetic field. Approximative solutions have been proposed, but because th...
Citation: 2D Materials
PubDate: 2017-11-08T00:00:00Z
DOI: 10.1088/2053-1583/aa9647
Issue No: Vol. 5, No. 1 (2017)

• Confined transverse electric phonon polaritons in hexagonal boron nitrides
• Authors: Muhyiddeen Yahya Musa; Maturi Renuka, Xiao Lin, Rujiang Li, Huaping Wang, Erping Li, Baile Zhang Hongsheng Chen
First page: 015018
Abstract: We predict the existence of confined transverse electric (TE) phonon polaritons in an ultrathin hexagonal boron nitride ( h BN) slab below h BN’s second transverse optical frequency. The skin depth of TE phonon polaritons can be decreased to subwavelength scale by increasing the thickness of h BN to several nanometers. Due to the strong spatial confinement, these TE phonon polaritons, different from TE graphene plasmons, can stably exist even when the permittivities of the superstrate and substrate are largely different. These revealed advantages of TE phonon polaritons might lead to potential applications of h BN in the manipulation of TE waves, such as the design of novel waveguides, polarizers, and the exploration of negative refraction between TE polaritons.
Citation: 2D Materials
PubDate: 2017-11-08T00:00:00Z
DOI: 10.1088/2053-1583/aa9643
Issue No: Vol. 5, No. 1 (2017)

• Structural and electronic transformation in low-angle twisted bilayer
graphene
• Authors: Fernando Gargiulo; Oleg V Yazyev
First page: 015019
Abstract: Experiments on bilayer graphene unveiled a fascinating realization of stacking disorder where triangular domains with well-defined Bernal stacking are delimited by a hexagonal network of strain solitons. Here we show by means of numerical simulations that this is a consequence of a structural transformation of the moiré pattern inherent to twisted bilayer graphene taking place at twist angles θ below a crossover angle ##IMG## [http://ej.iop.org/images/2053-1583/5/1/015019/tdmaa9640ieqn001.gif] {$\theta^{\star}=1.2^{\circ}$} . The transformation is governed by the interplay between the interlayer van der Waals interaction and the in-plane strain field, and is revealed by a change in the functional form of the twist energy density. This transformation unveils an electronic regime characteristic of vanishing twist angles in which the charge density converges, though not uniformly, to that of ideal bilayer graphene with Bernal stacking. On the other hand...
Citation: 2D Materials
PubDate: 2017-11-08T00:00:00Z
DOI: 10.1088/2053-1583/aa9640
Issue No: Vol. 5, No. 1 (2017)

• Covalent chemical functionalization enhances the biodegradation of
graphene oxide
• Authors: Rajendra Kurapati; Fanny Bonachera, Julie Russier, Adukamparai Rajukrishnan Sureshbabu, Cécilia Ménard-Moyon, Kostas Kostarelos Alberto Bianco
First page: 015020
Abstract: Biodegradation of the graphene-based materials is an emerging issue due to their estimated widespread usage in different industries. Indeed, a few concerns have been raised about their biopersistence. Here, we propose the design of surface-functionalized graphene oxide (GO) with the capacity to degrade more effectively compared to unmodified GO using horseradish peroxidase (HRP). For this purpose, we have functionalized the surface of GO with two well-known substrates of HRP namely coumarin and catechol. The biodegradation of all conjugates has been followed by Raman, dynamic light scattering and electron microscopy. Molecular docking and gel electrophoresis have been carried out to gain more insights into the interaction between GO conjugates and HRP. Our studies have revealed better binding when GO is functionalized with coumarin or catechol compared to control GOs. All results prove that GO functionalized with coumarin and catechol moieties display a faster and more efficient...
Citation: 2D Materials
PubDate: 2017-11-13T00:00:00Z
DOI: 10.1088/2053-1583/aa8f0a
Issue No: Vol. 5, No. 1 (2017)

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