2D Materials最新文献

{"title":"Scanning tunneling microscopy study of epitaxial Fe3GeTe2 monolayers on Bi2Te3","authors":"Brad M Goff, Wenyi Zhou, Alexander J Bishop, Ryan Bailey-Crandell, Katherine Robinson, Roland K Kawakami, Jay A Gupta","doi":"10.1088/2053-1583/ad1c6d","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1c6d","url":null,"abstract":"Introducing magnetism to the surface state of topological insulators, such as Bi₂Te₃, can lead to a variety of interesting phenomena. We use scanning tunneling microscopy (STM) to study a single quintuple layer (QL) of the van der Waals magnet Fe₃GeTe₂ (FGT) that is grown on Bi₂Te₃ via molecular beam epitaxy. STM topographic images show that the FGT grows as free-standing islands on Bi₂Te₃ and outwards from Bi₂Te₃ steps. Atomic resolution imaging shows triangular lattices of 390 ± 10 pm for FGT and 430 ± 10 pm for Bi₂Te₃, consistent with the respective bulk crystals. A moiré pattern is observed on FGT regions with a periodicity of 4.3 ± 0.4 nm that can be attributed solely to this lattice mismatch and thus indicates zero rotational misalignment. While most of the surface is covered by a single QL of the FGT, there are small double QL regions, as well as regions with distinct chemical terminations due to an incomplete QL. The most common partial QL surface termination is the FeGe layer, in which the top two atomic layers are missing. This termination has a distinctive electronic structure and a <inline-formula>\u0000<tex-math><?CDATA $left( {sqrt 3 {text{ }}x{text{ }}sqrt 3 } right)R{30^circ }$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mfenced close=\")\" open=\"(\"><mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt><mml:mrow><mml:mtext> </mml:mtext></mml:mrow><mml:mi>x</mml:mi><mml:mrow><mml:mtext> </mml:mtext></mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt></mml:mrow></mml:mfenced><mml:mi>R</mml:mi><mml:mrow><mml:msup><mml:mn>30</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"tdmad1c6dieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> reconstruction overlaid on the moiré pattern in STM images. Magnetic circular dichroism measurements confirm these thin FGT films are ferromagnetic with <italic toggle=\"yes\">T</italic>\u0000_C ∼190 K.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"68 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Raman spectroscopy of monolayer to bulk PtSe2 exfoliated crystals","authors":"Marin Tharrault, Eva Desgué, Dominique Carisetti, Bernard Plaçais, Christophe Voisin, Pierre Legagneux, Emmanuel Baudin","doi":"10.1088/2053-1583/ad1e79","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1e79","url":null,"abstract":"Raman spectroscopy is widely used to assess the quality of 2D materials thin films. This report focuses on <inline-formula>\u0000<tex-math><?CDATA $mathrm{PtSe_2}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mi mathvariant=\"normal\">P</mml:mi><mml:mi mathvariant=\"normal\">t</mml:mi><mml:mi mathvariant=\"normal\">S</mml:mi><mml:msub><mml:mi mathvariant=\"normal\">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"tdmad1e79ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, a noble transition metal dichalcogenide which has the remarkable property to transit from a semi-conductor to a semi-metal with increasing layer number. While polycrystalline <inline-formula>\u0000<tex-math><?CDATA $mathrm{PtSe_2}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mi mathvariant=\"normal\">P</mml:mi><mml:mi mathvariant=\"normal\">t</mml:mi><mml:mi mathvariant=\"normal\">S</mml:mi><mml:msub><mml:mi mathvariant=\"normal\">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"tdmad1e79ieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> can be grown with various crystalline qualities, getting insight into the monocrystalline intrinsic properties remains challenging. We report on the study of exfoliated 1–10 layers <inline-formula>\u0000<tex-math><?CDATA $mathrm{PtSe_2}$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mi mathvariant=\"normal\">P</mml:mi><mml:mi mathvariant=\"normal\">t</mml:mi><mml:mi mathvariant=\"normal\">S</mml:mi><mml:msub><mml:mi mathvariant=\"normal\">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"tdmad1e79ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> by Raman spectroscopy, featuring record linewidth. The clear Raman signatures allow layer-thickness identification and provides a reference metrics to assess crystal quality of grown films.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"79 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139757186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tuning the atomic and electronic structures of mirror twin boundaries in molecular beam epitaxy grown MoSe2 monolayers via rhenium doping","authors":"Zhoubin Yu, Yipu Xia, H. Komsa, Junqiu Zhang, Maohai Xie, Chuanhong Jin","doi":"10.1088/2053-1583/ad1d0c","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1d0c","url":null,"abstract":"\u0000 Interplay between defects like mirror twin boundaries (MTBs) and dopants may provide additional opportunities for furthering the research on two-dimensional monolayer (ML) transition metal dichalcogenides (TMDs). In this work, we successfully dope rhenium (Re) into molecular beam epitaxy grown ML MoSe2 and confirm the formation of a new type of MTBs, named 4|4E-M (M represents metal, Mo/Re) according to the configuration. Data from statistic atomic resolution scanning transmission electron microscopy (STEM) also reveals a preferable MTB enrichment of Re dopants, rather than intra-domain. In conjunction with density functional theory calculation results, we propose the possible routes for Re doping induced formation of 4|4E-M MTBs. Electronic structures of Re doped MTBs in ML MoSe2 are also predicted theoretically and then preliminarily tested by scanning tunnelling microscopy and spectroscopy.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"81 13","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139440462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Five near-infrared-emissive graphene quantum dots for multiplex bioimaging.","authors":"Alina Valimukhametova, Olivia Fannon, Ugur C. Topkiran, Abby Dorsky, Olivia Sottile, Roberto Gonzalez Rodriguez, J. Coffer, Anton V. Naumov","doi":"10.1088/2053-1583/ad1c6e","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1c6e","url":null,"abstract":"\u0000 Due to high tissue penetration depth and low autofluorescence backgrounds, near-infrared (NIR) fluorescence imaging has recently become an advantageous diagnostic technique used in a variety of fields. However, most of the NIR fluorophores do not have therapeutic delivery capabilities, exhibit low photostabilities, and raise toxicity concerns. To address these issues, we developed and tested five types of biocompatible graphene quantum dots (GQDs) exhibiting spectrally-separated fluorescence in the NIR range of 928 – 1053 nm with NIR excitation. Their optical properties in the NIR are attributed to either rare-earth metal dopants (Ho-NGQDs, Yb-NGQDs, Nd-NGQDs) or defect-states (NGQDs, RGQDs) as verified by Hartree-Fock calculations. Moderate up to 1.34 % quantum yields of these GQDs are well-compensated by their remarkable >4-hour photostability. At the biocompatible concentrations of up to 0.5 – 2 mg/mL GQDs successfully internalize into HEK-293 cells and enable in vitro imaging in the visible and NIR. Tested all together in HEK-293 cells five GQD types enable simultaneous multiplex imaging in the NIR-I and NIR-II shown for the first time in this work for GQD platforms. Substantial photostability, spectrally-separated NIR emission, and high biocompatibility of five GQD types developed here suggest their promising potential in multianalyte testing and multiwavelength bioimaging of combination therapies.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"29 3","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent progress on degradation mechanism and antioxidation of low-dimensional black phosphorus","authors":"Mingfu Fu, Jiabao Li, Wen Yang, Yong Zhang, Peizhi Yang","doi":"10.1088/2053-1583/ad1ae7","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1ae7","url":null,"abstract":"\u0000 Among the allotropes of phosphorus, black phosphorus (BP) is one of the most thermodynamically stable structures. Due to its unique physical and chemical properties, BP has shown considerable potential in many applications, such as field-effect transistors, energy storage and conversion, and photocatalysis. However, low-dimensional BP is easily corroded by oxygen and water owing to the large specific surface area and unbonded lone pair electrons on the surface, which reduces its chemical stability in the environment. As a result, different passivation approaches, relying on noncovalent bonding, covalent functionalization, and surface coordination, are employed to enhance the stability and performance of BP. In this review, the degradation mechanisms of BP are first analyzed for the material in both its ground state and excited state. Subsequently, the promising strategies for improving stability are overviewed. A comprehensive and in-depth understanding of the oxidation mechanisms and protection strategies of BP will provide guidance for the large-scale applications of BP and its derivatives.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"66 11","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139450303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control of the valley polarization of monolayer WSe2 by dexter-like coupling","authors":"Jakub Jasinski, Joshua Thompson, Swaroop Palai, Maciej Smiertka, M. Dyksik, T. Taniguchi, Kenji Watanabe, Michał Baranowskki, Duncan K. Maude, A. Surrente, E. Malic, P. Płochocka","doi":"10.1088/2053-1583/ad1ae8","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1ae8","url":null,"abstract":"\u0000 Intervalley scattering mechanisms strongly affect the dynamics of excitonic complexes in transition metal dichalcogenide monolayers. Here, we investigate the excitation energy dependence of the valley polarization of excitons in a WSe2 monolayer. We observe that the valley polarization drastically decreases when the excitation is resonant with the B1s resonance. This behaviour can be explained by a Dexter-like coupling in the momentum space between exciton states residing in opposite valleys but with the same spin configuration. This induces a net transfer of the exciton population from the optically driven valley towards the opposite, undriven valley. We observe the long-term fingerprints of this population transfer, as a vanishing valley polarization for the neutral exciton, and a negative valley polarization for biexcitonic complexes, in qualitative agreement with theoretical predictions based on a fully microscopic many-particle approach. This, together with a decrease of the PL energy when the excitation is resonant with the B1s state, points to the prominent role of the Dexter-like coupling in the exciton dynamics of atomically thin semiconductors.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"34 12","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139385408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MXene Fe2C as a promising candidate for the 2D XY ferromagnet","authors":"E M Agapov, I A Kruglov, A A Katanin","doi":"10.1088/2053-1583/ad10bc","DOIUrl":"https://doi.org/10.1088/2053-1583/ad10bc","url":null,"abstract":"Monolayer Fe₂C is expected to possess strong electronic correlations, which can significantly contribute to electronic and magnetic properties. In this study we consider electronic and magnetic properties of MXene Fe₂C within the DFT+DMFT approach. We establish the existence of local magnetic moments <inline-formula>\u0000<tex-math><?CDATA $mu_{mathrm{loc}} = 3.3,mu_B$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msub><mml:mi>μ</mml:mi><mml:mrow><mml:mrow><mml:mi mathvariant=\"normal\">l</mml:mi><mml:mi mathvariant=\"normal\">o</mml:mi><mml:mi mathvariant=\"normal\">c</mml:mi></mml:mrow></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:mn>3.3</mml:mn><mml:msub><mml:mi>μ</mml:mi><mml:mi>B</mml:mi></mml:msub></mml:math>\u0000<inline-graphic xlink:href=\"tdmad10bcieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in this compound, characterized by sufficiently long lifetime of <inline-formula>\u0000<tex-math><?CDATA $tausim 350$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>τ</mml:mi><mml:mo>∼</mml:mo><mml:mn>350</mml:mn></mml:math>\u0000<inline-graphic xlink:href=\"tdmad10bcieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> fs. We also calculate exchange interaction parameters accounting for electronic correlations using the recently developed approach for paramagnetic phase. At low temperatures, we obtain the strongest exchange interaction 11 meV between next nearest neighboring Fe atoms, located above (or below) the carbon plane, and the subleading interaction 6 meV between the next to next nearest neighboring atoms, located across the carbon plane. The resulting dependence of the Berzinskii–Kosterlitz–Thouless (BKT) and Curie temperatures on magnetic anisotropy is obtained. The BKT temperature for the pristine Fe₂C is <inline-formula>\u0000<tex-math><?CDATA $T_{mathrm{BKT}}simeq 300$?></tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msub><mml:mi>T</mml:mi><mml:mrow><mml:mrow><mml:mi mathvariant=\"normal\">B</mml:mi><mml:mi mathvariant=\"normal\">K</mml:mi><mml:mi mathvariant=\"normal\">T</mml:mi></mml:mrow></mml:mrow></mml:msub><mml:mo>≃</mml:mo><mml:mn>300</mml:mn></mml:math>\u0000<inline-graphic xlink:href=\"tdmad10bcieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> K, which makes this compound a good candidate for the two-dimensional ferromagnet with XY anisotropy.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"29 1","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139094510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photogating Enhanced Photodetectors Dominated by Rubrene Nanodots Modified SnS2 Films","authors":"Guoxiang Si, Fangjun Liu, Lizhao Su, Zhaoxuan Wu, Qi Zhang, Shuoqi Sun, Hongbin Zhang","doi":"10.1088/2053-1583/ad1a6d","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1a6d","url":null,"abstract":"\u0000 The hybrid-induced photogating effect is considered as an effective way for photoconductance modulating in low-dimensional photodetectors. Besides, through constructing the local photogate vertical heterostructures on 2D SnS2 surface can significantly increase its photoconductive gain. However, the potential of this photogain mechanism for SnS2 films has not yet been revealed in practical photodetection devices. To investigate its special advantages on promoting the optical-sensing activity, the high-quality SnS2 films with discrete, micro-area, and uniform rubrene-nanodots modification have been prepared. Benefit from the local interfacial photogating effect induced by hole trap states by rubrene-nanodots, the light-absorption and carrier-excitation efficiencies were significantly enhanced. Afterwards, the high-performance photodetector was designed based on the photogate vertical heterostructures of rubrene-nanodots/SnS2, which demonstrated an enhanced photoelectric response to 1064 nm light. Note that the maximum photocurrent density, photoresponsivity, and photodetectivity can reach up to 0.389 mA·cm-2, 388.71 mA·W-1, and 1.13×1010 Jones, respectively. Importantly, the optimal band-structure offsets accelerated the localized hole transfer from SnS2 film to rubrene-nanodots. The trapped holes in rubrene-nanodots induced an enhanced interface gating effect, which may help to modulate the number and lifetime of excess electrons under light illuminations. These superior features make the newly-developed photodetector be suitable for future multifunctional photodetection applications.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"20 6","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139388930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Control of stripe, skyrmion and skyrmionium formation in the 2D magnet Fe3−xGeTe2 by varying composition","authors":"M. Birch, L. Powalla, K. Litzius, V. Nehruji, Ondrej Hovorka, S. Wintz, F. Schulz, D. Mayoh, G. Balakrishnan, Markus Weigand, Marko Burghard, Gisela Schütz","doi":"10.1088/2053-1583/ad1a6b","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1a6b","url":null,"abstract":"\u0000 Two-dimensional (2D) van der Waals (vdW) magnets have recently emerged as novel skyrmion hosts. This discovery has opened a new material platform for tuning the properties of topological spin textures, such as by exploiting proximity effects induced by stacking of 2D materials into heterostructures, or by directly manipulating the structural composition of the host material. Previous works have considered the effect of varied composition in the bulk crystals of the vdW magnet Fe3-xGeTe2, but so far the effects on the hosted spin textures have not been thoroughly investigated. In this work, real-space x-ray microscopy is utilized to image magnetic stripe domain, skyrmion and composite skyrmion states in exfoliated flakes of Fe3-xGeTe2 with varying Fe deficiency x. In combination with supporting mean-field and micromagnetic simulations, the significant alterations in the magnetic phase diagrams of the flakes, and thus the stability of the observed spin textures, are revealed. These arise as a result of the varying temperature dependence of the fundamental magnetic properties, which are greater than can be explained by the removal of spins, and are consistent with previously reported changes in the electronic band structure via the Fe deficiency.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"4 2","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139451343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification of interlayer interaction in bilayer MoS2 due to monolayer WSe2 in heterostructures","authors":"Siwon Oh, Han-gyu Kim, Jungcheol Kim, Huiseok Jeong, H. Choi, Hyeonsik Cheong","doi":"10.1088/2053-1583/ad1a6f","DOIUrl":"https://doi.org/10.1088/2053-1583/ad1a6f","url":null,"abstract":"The low-frequency interlayer vibration modes in bilayer-MoS2/monolayer-WSe2 heterostructures were investigated to study the modification of interlayer interactions due to the moiré periodicity. The interplay of the interlayer interaction within bilayer MoS2 and the interfacial interaction between the two materials results in rich features in the phonon spectra. Several shear and breathing modes are observed for samples with small twist angles (<10°), whereas only one shear and two breathing modes are observed for larger twist angles. For larger twist angles, the interfacial interaction between the two materials amounts to ∼75% of the intrinsic interlayer interaction between the MoS2 layers. The phonon spectrum evolves non-monotonically as the twist angle increases, which is explained with the help of atomistic calculations.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":"53 19","pages":""},"PeriodicalIF":5.5,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139451823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}