Article
Chemistry, Physical
K. Idczak, E. Wachowicz
Summary: This study demonstrates that intercalated gadolinium atoms can significantly affect the electronic properties of graphene and the buffer layer, and temperature-induced intercalation can cause the buffer layer to decouple and transform into a new graphene layer.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Applied
Yong Han, James W. Evans, Michael C. Tringides
Summary: The study investigates the kinetic process of foreign guest atom intercalation into graphene layers and provides numerical values for the critical energy barriers through theoretical calculations.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jinjin Wang, Minsung Kim, Liangyao Chen, Kai-Ming Ho, Michael Tringides, Cai-Zhuang Wang, Songyou Wang
Summary: This paper systematically investigates the effect of lead intercalation on the structural and electronic properties of epitaxial graphene on the SiC substrate. The band structure of Pb-intercalated few-layer graphene can be effectively tuned through intercalation conditions, showing potential for manipulating the electronic properties of graphene layers. Lead intercalation at the interface between the buffer layer and the substrate decouples the layers and can transform the BL into a p-doped graphene layer.
Article
Chemistry, Multidisciplinary
Jimmy C. Kotsakidis, Marc Currie, Antonija Grubisic-Cabo, Anton Tadich, Rachael L. Myers-Ward, Matthew DeJarld, Kevin M. Daniels, Chang Liu, Mark T. Edmonds, Amadeo L. Vazquez de Parga, Michael S. Fuhrer, D. Kurt Gaskill
Summary: Laser patterning on graphene can overcome challenges in magnesium intercalation, significantly increasing the rate of magnesium insertion. Magnesium intercalation likely starts at graphene discontinuities, accelerating the 2D crystal growth of magnesium silicide, and this technique may be applied to facilitate rapid intercalation of other substances.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Physical
Ivan Shtepliuk, Rositsa Yakimova
Summary: This paper discusses the adsorption, diffusion, and intercalation processes of hydrogen and lithium on monolayer epitaxial graphene grown on 4H-SiC, revealing strong and stable chemisorption of hydrogen on the top site of epitaxial graphene and lithiation process occurring via formation of LiC6 phase.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yong Han, Marek Kolmer, Michael C. Tringides, James W. Evans
Summary: SiC-supported graphene intercalated by a two-dimensional Pb monolayer is a promising platform for spintronic applications. The thermodynamic stability of this structure has been confirmed in recent experiments. However, the details of intercalated phases, location of atoms, thermodynamic preference, and intercalation pathways are still not fully understood. In this study, extensive density functional theory calculations were conducted to investigate the thermodynamics and kinetics of Pb intercalation on graphene/SiC(0001). The results suggest that intercalation of complete Pb layers in the gallery is strongly favored over other configurations, and more complex intercalation pathways are involved.
Article
Chemistry, Physical
Bolortsetseg Tuvdendorj, Nyamaa Tsogtbaatar, Altaibaatar Lkhagvasuren, Jae M. Seo, Myung-Whun Kim, Hidong Kim
Summary: The relation between charge transfer doping in quasi-free-standing monolayer graphene (QFMLG) and the structure of intercalated SiGe alloy films formed on 6H-SiC(0001) was investigated. It was found that when 0.4-ML Ge was additionally intercalated, a SiGe film with a 31 x 2 3 structure was generated, leading to weakly n-doped QFMLG. Conversely, when the amount of additionally intercalated Ge exceeded 0.6 ML, a SiGe film with the 2x 1.5n 3 and/or 4x 3 3 structure was formed below QFMLG. The results showed that the charge transferred from the SiGe film to QFMLG was independent of the composition ratio.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Alberto Anadon, Adrian Gudin, Ruben Guerrero, Iciar Arnay, Alejandra Guedeja-Marron, Pilar Jimenez-Cavero, Jose Manuel Diez Toledano, Fernando Ajejas, Maria Varela, Sebastien Petit-Watelot, Irene Lucas, Luis Morellon, Pedro Antonio Algarabel, Manuel Ricardo Ibarra, Rodolfo Miranda, Julio Camarero, Juan Carlos Rojas-Sanchez, Paolo Perna
Summary: The study shows that a graphene monolayer between Co and a heavy metal (HM) can effectively preserve the spin current injected into the HM from the bottom Co layer, as revealed by thermo-spin measurements. The presence of the graphene monolayer leads to a reduction in the sum of spin Seebeck and interfacial contributions, independent of the spin Hall angle sign of the HM used.
Article
Physics, Applied
Yongheng Zhang, Xuedong Xie, Junyu Zong, Wang Chen, Fan Yu, Qichao Tian, Qinghao Meng, Can Wang, Yi Zhang
Summary: Investigation of interfacial charge transfer between different layers of graphene and WSe2 revealed that monolayer graphene transferred more electrons to WSe2 compared to bilayer and trilayer graphene. This information is important for understanding charge transfer behaviors in 2D stacking-heterostructures and for the design of future nano-devices based on 2D materials.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Filippo Fabbri, Manuela Scarselli, Naveen Shetty, Sergey Kubatkin, Samuel Lara-Avila, Mathieu Abel, Isabelle Berbezier, Holger Vach, Matteo Salvato, Maurizio De Crescenzi, Paola Castrucci
Summary: Epitaxial graphene has been proven to be an excellent substrate for synthesizing two-dimensional materials. Silicene, a highly anticipated material, has been successfully grown on a slightly defective epitaxial graphene network, opening possibilities for controlled intercalation of silicon atoms and future nanotechnology applications.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Nan Gao, Xiaoqing Liang, Jijun Zhao, Yue Chen
Summary: The study found that the most common structural defect in monolayer TaS2 is the single S atom vacancy defect, with a formation energy below 2 eV. For grain boundaries, 4x4 and 4x8 defect rings are predicted to form more easily than 5x7. In the hydrogen evolution reaction process, the binding strengths of different defect sites are related to the p- or d-band center of the S or Ta atom.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Coatings & Films
Yong Han, James W. Evans, Michael C. Tringides
Summary: We analyze the adsorption and intercalation processes of hydrogen on a graphene surface on SiC through first-principles calculations. Our results show that intercalation between the top-layer and buffer-layer graphene is thermodynamically more favorable than adsorption on the top-layer graphene. We also calculate the energy barriers for hydrogen diffusion on and under the graphene layer and assess the penetration capability of hydrogen atoms on the graphene terrace.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Chemistry, Multidisciplinary
Li Sun, Peng Wang, Xuejian Xie, Xiufang Chen, Fapeng Yu, Yanlu Li, Xiangang Xu, Xian Zhao
Summary: In this study, quasi-free-standing bilayer epitaxial graphene (QFSBEG) on SiC was fabricated by H-2 intercalation under different time periods. The temperature-dependent Raman spectra were recorded to evaluate the intrinsic structural difference generated by H-2 time duration. The study found that H-2 intercalation significantly weakened the pinning effect in epitaxial graphene, and observed a disparity of pinning effects between QFSBEG samples. Additionally, the anharmonic phonon effect was investigated from the Raman lineshift of peaks.
Article
Materials Science, Multidisciplinary
A. A. Rybkina, S. O. Filnov, A. Tarasov, D. Danilov, M. Likholetova, V. Yu Voroshnin, D. A. Pudikov, D. A. Glazkova, A. Eryzhenkov, I. A. Eliseyev, V. Yu Davydov, A. M. Shikin, A. G. Rybkin
Summary: The electronic and crystal structure of zero-layer graphene grown on 6H-SiC(0001) is modified after Co intercalation, transforming into a graphene monolayer with CoSi/CoSi2 structure formed between graphene and SiC substrate. The magnetic properties show ferromagnetic behavior with an open hysteresis loop, and the Dirac cone characteristic of quasi-freestanding graphene is observed.
Article
Chemistry, Multidisciplinary
Haruko Toyama, Ryota Akiyama, Satoru Ichinokura, Mizuki Hashizume, Takushi Iimori, Yukihiro Endo, Rei Hobara, Tomohiro Matsui, Kentaro Horii, Shunsuke Sato, Toru Hirahara, Fumio Komori, Shuji Hasegawa
Summary: This study reveals the crucial role of the interface between monolayer graphene and the SiC substrate in the superconductivity induced by Ca-intercalation. Through Ca-termination of SiC, the carbon layer at the interface changes to graphene, and Ca is intercalated between the graphene layers, leading to superconductivity. The relationship between the critical temperature and the normal-state conductivity exhibits an unusual dome-shaped pattern.
Article
Nanoscience & Nanotechnology
Yi-Ying Lu, Yan-Ting Huang, Jia-Ni Chen, Jie Jhou, Liang-Wei Lan, Chien-Cheng Kuo, Jui-Hung Hsu, Shang-Hsien Hsieh, Chia-Hao Chen, Raman Sankar
Summary: The energy barrier formed at the interface between a 2D material and a bulk metal is critical for the performance of nanoelectronic devices. The commonly used Schottky-Mott rule fails to predict the correct band alignment due to surface states or a strong coupling. Using X-ray photoemission spectroscopy and temperature-dependent transport measurements, the valence band offset and energy barrier at the indium/indium selenide interface were determined. The study found that indium selenide can be tuned from metallic to insulating by conventional SiO2 dielectric gate tuning.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Yen-Hui Lin, Chia-Hsiu Hsu, Iksu Jang, Chia-Ju Chen, Pok-Man Chiu, Deng-Sung Lin, Chien-Te Wu, Feng-Chuan Chuang, Po-Yao Chang, Pin-Jui Hsu
Summary: Proximity-induced anisotropic superconductivity was investigated in a monolayer Ni-Pb binary alloy, revealing a reduced but anisotropic superconducting gap.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Multidisciplinary
Aniceto B. Maghirang, Gennevieve Macam, Ali Sufyan, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: This study systematically investigates the properties of M2C (M = Mo or W) with different surface functionalizations in 1T and 2H structures using first-principles and hybrid functional calculations. The results show that M2CO2 can be used as size-controllable 2D topological insulators, which have promising potential applications.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Liang-Ying Feng, Rovi Angelo B. Villaos, Aniceto B. Maghirang, Zhi-Quan Huang, Chia-Hsiu Hsu, Hsin Lin, Feng-Chuan Chuang
Summary: Through the study of Zintl compounds CaM2X2, it was discovered that CaM2Bi2 (M = Zn or Cd) is a new type of topological crystalline insulator with four-fold degenerate Dirac points. These findings provide a new field for the search of new topological materials.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Marku Nyevel R. Perez, Rovi Angelo B. Villaos, Liang-Ying Feng, Aniceto B. Maghirang III, Chih-Peng Cheng, Zhi-Quan Huang, Chia-Hsiu Hsu, Arun Bansil, Feng-Chuan Chuang
Summary: Recent first-principles calculations explore the stability and topological properties of Zintl single-quintuple-layer compounds in the CaAl2Si2 structure. The study reveals insulating topological phases driven by band inversion and the possibility of coexisting insulating and superconducting topological phases. The synthesis of these compounds through atomic substitutions is also discussed.
APPLIED PHYSICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
Ajay Tiwari, D. Chandrasekhar Kakarla, G. Macam, C. H. Hsu, F. C. Chuang, H. C. Wu, T. W. Kuo, Arkadeb Pal, H. Chou, D. P. Gulo, H. L. Liu, Y. C. Chuang, Y. C. Lai, C. A. Lee, Mitch M. C. Chou, H. D. Yang
Summary: A high-quality NiTe2O5 single crystal was grown and investigated for its higher-order magnetoelectric coupling effect. The study revealed that magnetoelastic coupling plays a critical role in bridging the electrical and magnetic properties in this material, with p-d hybridization being a possible mechanism for the observed effect.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ali Sufyan, Gennevieve Macam, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: Based on first-principles calculations and hybrid functional analysis, this study reveals that the monolayer copper sulfide (Cu2S) possesses an intrinsic quantum spin Hall (QSH) phase, Rashba spin splitting, and a large band gap of 220 meV suitable for room-temperature applications. Heterostructures of Cu2S films on various substrates demonstrate the preserved topological properties. This suggests that Cu2S could serve as a platform for inversion-asymmetric QSH insulators with potential applications in low-dissipation electronic devices.
Article
Materials Science, Multidisciplinary
Ali Sufyan, Aniceto B. Maghirang, Gennevieve Macam, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: This study investigates the electronic and topological band evolution of two-dimensional transition metal monocarbides (2D MXenes) using first-principles calculations. The results show that V2C and Nb2C exhibit non-trivial topological phases, while Ta2C exhibits a trivial phase. Additionally, V2C undergoes a Lifshitz electronic transition from a semi-metallic to a topological insulating phase.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Winda Purwitasari, Rovi Angelo B. Villaos, Ina Marie R. Verzola, Ali Sufyan, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: In recent years, the search for alternative energy sources, including thermoelectricity, has been a major research interest. Studies on transition-metal dichalcogenides (TMDs), such as technetium-based TMDs (TcX2), have also been unstoppable due to their unique properties. This study systematically investigated the structural stability, electronic properties, and thermoelectric properties of TcX2, particularly the 1T(dp) phase, using first-principles calculations. The results showed that the monolayer 1T(dp)-TcX2 could potentially have excellent thermoelectric properties, and reducing the dimensionality from bulk to monolayer could significantly improve the thermoelectric properties of TcTe2.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yuita Fujisawa, Markel Pardo-Almanza, Chia-Hsiu Hsu, Atwa Mohamed, Kohei Yamagami, Anjana Krishnadas, Guoqing Chang, Feng-Chuan Chuang, Khoong Hong Khoo, Jiadong Zang, Anjan Soumyanarayanan, Yoshinori Okada
Summary: Through systematic investigation of epitaxial Cr1+delta Te2 thin films, it is revealed that this magnetic transition metal dichalcogenide exhibits momentum-space Berry curvature effects conducive to spin-based topological phenomena, and its electron filling can be tuned through doping. Spectroscopic experiments and transport experiments demonstrate the presence of a characteristic semi-metallic band region and the change in the intrinsic component of the anomalous Hall effect, respectively. Density functional theory calculations establish a link between the doping evolution of the band structure and the anomalous Hall effect.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ina Marie R. Verzola, Rovi Angelo B. Villaos, Winda Purwitasari, Zhi-Quan Huang, Chia-Hsiu Hsu, Guoqing Chang, Hsin Lin, Feng-Chuan Chuang
Summary: This study systematically investigates the stability, electronic properties, and topological characteristics of Re-based transition metal dichalcogenides. The research reveals that these materials exhibit highly tunable properties, excellent thermoelectric performance, and potential for spintronics applications.
MATERIALS TODAY COMMUNICATIONS
(2022)
Review
Chemistry, Analytical
Phuong V. Pham, The-Hung Mai, Huy-Binh Do, Vinoth Kumar Ponnusamy, Feng-Chuan Chuang
Summary: This article provides an overview of the applications of graphene heterostructure devices in optical sensing and optoelectronics. It discusses the use of graphene heterostructures in various systems such as ultrafast optical sensing, plasmonic systems, optical waveguides, optical spectrometers, and optical synaptic systems. The article also highlights important research on improving the performance and stability of graphene heterostructures and reveals their pros and cons, as well as the synthesis and nanofabrication sequences in optoelectronics.
Article
Chemistry, Multidisciplinary
Ali Sufyan, Gennevieve Macam, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: This study investigates the electronic and topological properties of inversion-asymmetric monolayer copper sulfide (Cu2S) using first-principles analysis. It is found that monolayer Cu2S exhibits a QSH phase, Rashba spin splitting, and a large band gap, and these properties are preserved when Cu2S is deposited on different substrates. This suggests that Cu2S could serve as a platform for realizing inversion-asymmetric QSH insulators with potential applications in low-dissipation electronic devices.
Article
Engineering, Electrical & Electronic
Aniceto B. Maghirang III, Rovi Angelo B. Villaos, Marku Nyevel R. Perez, Liang-Ying Feng, Zhi-Quan Huang, Chia-Hsiu Hsu, Feng-Chuan Chuang
Summary: The complex-structured Zintl phase compounds, including the T2 monolayer Sr2CdBi2, exhibit topological insulating phases and Rashba spin splittings.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Aldrin G. Chang, Liang-Wei Lan, Yao-Jui Chan, Chia-Nung Kuo, Ting Chen, Chih-Heng Huang, Tzu-Hung Chuang, Der-Hsin Wei, Chin-Shan Lue, Chien-Cheng Kuo
Summary: The electronic structure of FePS3 was investigated using x-ray absorption spectroscopy, revealing a larger energy splitting and the presence of metal-ligand covalency in the system. These findings are crucial in understanding the electronic structure of FePS3 and its potential spintronic applications.
