Article
Nanoscience & Nanotechnology
Saban M. Hus, Ruijing Ge, Po-An Chen, Liangbo Liang, Gavin E. Donnelly, Wonhee Ko, Fumin Huang, Meng-Hsueh Chiang, An-Ping Li, Deji Akinwande
Summary: Non-volatile resistive switching, also known as memristor effect, has emerged as an important concept in high-density information storage, computing, and reconfigurable systems. Recent discoveries in two-dimensional monolayers have refuted previous beliefs and added a new dimension to materials science.
NATURE NANOTECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Kun Peng, Wei Ren, Ying Wu, Hao Ru, Shuai Lu, Aixi Chen, Pengdong Wang, Xinwei Fang, Huifang Li, Lifeng Chi, Sunan Ding, Li Wang, Yihua Wang, Fangsen Li
Summary: Scientists have successfully synthesized a two-dimensional tellurium oxide polymorph, rutile TeO2, with a metallic Fermi surface on a tetragonal FeTe surface using interface engineering and in situ tunneling spectroscopy.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Xin Shen, Meiqi Yang, Chengxing He, Tianshuo Zhao, Devan Solanki, Rito Yanagi, Ben Gibbs, Gouri Krishnan, Shu Hu
Summary: In this research, atomic layer deposition (ALD) was used to grow a new (Ti,Cr)O-x film as a subset of electrochromic (EC) coatings that can directly contact aqueous solutions and have protective and bipolar coloration properties. This study showed that the ALD-grown ternary EC coating can also act as a surface protection layer and has unique advantages in achieving balanced performance among color tunability, coloration efficiency, and cycle stability.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xin Shen, Meiqi Yang, Chengxing He, Tianshuo Zhao, Devan Solanki, Rito Yanagi, Ben Gibbs, Gouri Krishnan, Shu Hu
Summary: This study fills the gaps in the current research on EC materials by employing atomic layer deposition (ALD) to grow a (Ti,Cr)Ox film as a new subset of EC coatings that operates in direct contact with aqueous solutions. The protective and bipolar coloration properties of the (Ti,Cr)Ox are achieved by the ALD alloying of TiO2 and CrOx nanocrystals. The results show that this ALD-grown ternary EC coating can also act as a surface protection layer and has unique advantages over other EC materials to achieve balanced performance among color tunability, coloration efficiency, and cycle stability.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Physical
Caiyun Wei, Wei Xu, Shurui Ji, Ruiyun Huang, Junyang Liu, Wenqiu Su, Jie Bai, Jiale Huang, Wenjing Hong
Summary: Metallic clusters have potential as candidates for creating nanoelectronic devices at the single-cluster level. They offer an alternative pathway to silicon-based electronics and organic molecules for miniaturized electronics. However, a clear guide for selecting, synthesizing, and fabricating functional single-cluster electronic devices is still needed.
Article
Biochemistry & Molecular Biology
Semyon T. Baidak, Alexey V. Lukoyanov
Summary: The electronic and band structures of Gd- and Sb-based intermetallic materials were investigated using theoretical ab initio methods, taking into account the strong electron correlations of Gd-4f electrons. Different electronic properties were found in various compounds, including semimetal, half-metal, semiconductor, and metallic states, as well as topological features. These findings suggest the potential applications of Gd-Sb-based materials in fields such as transport and magnetism.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Multidisciplinary Sciences
Hongyu Jiang, Jiyu Xu, Qinghua Zhang, Qian Yu, Laiquan Shen, Ming Liu, Yitao Sun, Chengrong Cao, Dong Su, Haiyang Bai, Sheng Meng, Baoan Sun, Lin Gu, Weihua Wang
Summary: This study directly observed the fractal atomic structure in thin metallic glassy membranes, with the fractal dimension depending on atomic density. The atomic configuration in the metallic glass membrane consists of various polygons with bonding angles concentrated on 45 degrees-55 degrees. The fractal atomic structure is consistent with percolation theory analysis and may explain the enhanced relaxation dynamics and ease of glass transition observed in thin metallic glassy films or surfaces.
Article
Chemistry, Multidisciplinary
Wen Wan, Paul Dreher, Daniel Munoz-Segovia, Rishav Harsh, Haojie Guo, Antonio J. Martinez-Galera, Francisco Guinea, Fernando de Juan, Miguel M. Ugeda
Summary: This study reports the existence of a soft collective mode in single-layer NbSe2, observed as a characteristic resonance excitation in high-resolution tunneling spectra. The frequency and amplitude of this resonance change with temperature and magnetic field, establishing a direct link to the superconducting state.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fei Hui, Peisong Liu, Stephen A. Hodge, Tian Carey, Chao Wen, Felice Torrisi, D. Thanuja L. Galhena, Flavia Tomarchio, Yue Lin, Enrique Moreno, Juan B. Roldan, Elad Koren, Andrea C. Ferrari, Mario Lanza
Summary: This study demonstrates the use of conductive atomic force microscopy to explore nano-synaptic response in metal/graphene oxide/metal nano-synapses, revealing properties such as potentiation and paired pulse facilitation. The results suggest graphene oxide as an important candidate for creating ultrasmall electronic synapses that meet the integration density requirements of neuromorphic systems.
Article
Nanoscience & Nanotechnology
Mikko Nisula, Antti J. Karttunen, Eduardo Solano, Girish C. Tewari, Maarit Karppinen, Matthias Minjauw, Himanshu Sekhar Jena, Pascal Van der Voort, Dirk Poelman, Christophe Detavernier
Summary: The study explores the relationship between the electrical conductivity, structure, and oxidation state of one-dimensional coordination polymer thin films of N,N'-dimethyl dithiooxamidato-copper prepared by atomic/molecular layer deposition. The results indicate that the electrical conductivity of the films is highly dependent on the oxidation state, with a significant increase in conductivity upon partial reduction and the observed metallic behavior in the high-conductance state.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
Wenshuai Gao, Zheng Chen, Wensen Wei, Chao Yan, Shasha Wang, Jin Tang, Ranran Zhang, Lixun Cheng, Pengfei Nan, Jie Wang, Yuyan Han, Chuanying Xi, Binghui Ge, Lin He, Haifeng Du, Wei Ning, Xiangde Zhu, Mingliang Tian
Summary: We present a comprehensive study on Cu1.89Te single crystals using transport measurements, electron microscopy, and Raman spectroscopy. The material exhibits metal-semiconductor transitions at low temperatures and linear magnetoresistance up to 33 T. Electron diffraction patterns reveal a stable room-temperature phase with a modulated superstructure. Structural transitions from the room-temperature commensurate I phase to the low temperature commensurate II phase are observed through transmission electron microscopy and scanning tunneling microscopy. The results provide evidence for charge density wave formations in Cu1.89Te and suggest potential applications in future nano-devices.
CHINESE PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Antonio Esau Del Rio Castillo, M. Laura Soriano, Marek Grzelczak, Mildred Quintana, Maurizio Prato
Summary: A straightforward protocol is proposed to covalently bond gold nanoparticles exclusively at the tips of single-walled carbon nanotubes. The attachment of non-functionalized gold nanoparticles onto the main nanotube body is prevented by the steric hindrance provided by a polymer and surfactant. These novel heterostructures show promising potential for applications in photonics and electronic devices.
Article
Chemistry, Multidisciplinary
Hiroshi Mizoguchi, Sang-Won Park, Takayoshi Katase, Grigori V. Vazhenin, Junghwan Kim, Hideo Hosono
Summary: This study found that the anti-ReO3-type compound Na3N exhibits metallic nature due to the presence of a crystallographic cavity causing the collapse of the bandgap and the formation of a wide Na 3s conduction band. Na3N is a unique nitride with an electronically active cavity space.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
K. K. Qiu, X. D. Wang, T. D. Xu, Q. . P. Cao, S. Q. Ding, D. X. Zhang, K. A. Beyer, J. Z. Jiang
Summary: The memory effect in metallic glasses is observed through differential scanning calorimetry and molecular dynamics simulations, indicating that it may originate from the structural rejuvenation and formation of more loose packing configurations during high temperature annealing. In contrast, the high-low temperature annealing only induces monotonic relaxation.
MATERIALS TODAY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Sungsoo Hahn, Byungmin Sohn, Minjae Kim, Jeong Rae Kim, Soonsang Huh, Younsik Kim, Wonshik Kyung, Minsoo Kim, Donghan Kim, Youngdo Kim, Tae Won Noh, Ji Hoon Shim, Changyoung Kim
Summary: In situ angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES (SARPES) experiments were conducted to investigate the relationship between electronic band structures and ferromagnetism in SrRuO3 (SRO) thin films. The results showed clear spin-lifted band structures with spin polarization strongly dependent on momentum. As temperature increased, the spin-splitting gap decreased and band dispersions became incoherent, indicating spin-dependent electron correlations in SRO. This finding helps to explain the connection between ferromagnetism and electronic structure in SRO, which has been debated for decades.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Wonshik Kyung, Choong H. Kim, Yeong Kwan Kim, Beomyoung Kim, Chul Kim, Woobin Jung, Junyoung Kwon, Minsoo Kim, Aaron Bostwick, Jonathan D. Denlinger, Yoshiyuki Yoshida, Changyoung Kim
Summary: This study demonstrates that electric field can drive the rotation of octahedra in Sr2RuO4, and the surface electric field originates from the surface electric field, which can be tuned via the screening effect of the overlaid K layer. This work not only establishes that variation in the OR angle can be induced by an electric field, but also provides a way to control OR, which is an important step toward in situ control of the physical properties of perovskite oxides.
NPJ QUANTUM MATERIALS
(2021)
Article
Physics, Applied
Donghan Kim, Byungmin Sohn, Minsoo Kim, Sungsoo Hahn, Youngdo Kim, Jong Hyuk Kim, Young Jai Choi, Changyoung Kim
Summary: We investigated the anomalous Hall effect and hump structure in SrRuO3 ultra-thin films with an SrTiO3 capping layer and ionic liquid gating. The STO capping led to sign changes in the AHE and modulation of the hump structure, showing that the hump structure and AHE can be controlled by tuning inversion symmetry and the electric field at the interface.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Byungmin Sohn, Eunwoo Lee, Se Young Park, Wonshik Kyung, Jinwoong Hwang, Jonathan D. Denlinger, Minsoo Kim, Donghan Kim, Bongju Kim, Hanyoung Ryu, Soonsang Huh, Ji Seop Oh, Jong Keun Jung, Dongjin Oh, Younsik Kim, Moonsup Han, Tae Won Noh, Bohm-Jung Yang, Changyoung Kim
Summary: Magnetism and spin-orbit coupling play crucial roles in topological transport phenomena in itinerant ferromagnets. Two-dimensional systems may have stable nodal structures, and perovskite oxides generally support symmetry-protected nodal lines and points in their spin-polarized band structures.
Correction
Chemistry, Physical
Byungmin Sohn, Eunwoo Lee, Se Young Park, Wonshik Kyung, Jinwoong Hwang, Jonathan D. Denlinger, Minsoo Kim, Donghan Kim, Bongju Kim, Hanyoung Ryu, Soonsang Huh, Ji Seop Oh, Jong Keun Jung, Dongjin Oh, Younsik Kim, Moonsup Han, Tae Won Noh, Bohm-Jung Yang, Changyoung Kim
Article
Physics, Multidisciplinary
Sungsoo Hahn, Byungmin Sohn, Minjae Kim, Jeong Rae Kim, Soonsang Huh, Younsik Kim, Wonshik Kyung, Minsoo Kim, Donghan Kim, Youngdo Kim, Tae Won Noh, Ji Hoon Shim, Changyoung Kim
Summary: In situ angle-resolved photoemission spectroscopy (ARPES) and spin-resolved ARPES (SARPES) experiments were conducted to investigate the relationship between electronic band structures and ferromagnetism in SrRuO3 (SRO) thin films. The results showed clear spin-lifted band structures with spin polarization strongly dependent on momentum. As temperature increased, the spin-splitting gap decreased and band dispersions became incoherent, indicating spin-dependent electron correlations in SRO. This finding helps to explain the connection between ferromagnetism and electronic structure in SRO, which has been debated for decades.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Junhyeon Jo, Jung Hwa Kim, Choong H. Kim, Jaebyeong Lee, Daeseong Choe, Inseon Oh, Seunghyun Lee, Zonghoon Lee, Hosub Jin, Jung-Woo Yoo
Summary: This article presents a method to generate layer-by-layer defect gradients in a van der Waals material, inducing the Rashba effect by breaking spatial inversion symmetry. The effectiveness of the method is verified through experiments and theoretical calculations, paving the way for functional defect engineering in electronic applications.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Minsoo Kim, Junyoung Kwon, Choong H. Kim, Younsik Kim, Daun Chung, Hanyoung Ryu, Jongkeun Jung, Beom Seo Kim, Dongjoon Song, Jonathan D. Denlinger, Moonsup Han, Yoshiyuki Yoshida, Takashi Mizokawa, Wonshik Kyung, Changyoung Kim
Summary: The study observes the occurrence of KH in 4d perovskite oxide Ca2-xSrxRuO4 and finds a spectral weight transfer resembling the orbital-selective Mott phase. This study expands the application of Kondo physics to 4d multi-orbital systems.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Byungmin Sohn, Changyoung Kim
Summary: Transition metal perovskite oxide SrRuO3 exhibits different reconstructed electronic structures with varying film thicknesses. The change in octahedral rotations on the surface can be qualitatively estimated by comparing spectral weights of films with different thicknesses.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Jeong Rae Kim, Byungmin Sohn, Hyeong Jun Lee, Sangmin Lee, Eun Kyo Ko, Sungsoo Hahn, Sangjae Lee, Younsik Kim, Donghan Kim, Hong Joon Kim, Youngdo Kim, Jaeseok Son, Charles H. H. Ahn, Frederick J. J. Walker, Ara Go, Miyoung Kim, Choong H. H. Kim, Changyoung Kim, Tae Won Noh
Summary: Interfaces between dissimilar correlated oxides can be controlled to generate different electronic phases. In atomic-scale ruthenate-titanate heterostructures, three distinct correlated phases have been realized using atomic-scale epitaxy and photoemission spectroscopy. The theoretical analysis suggests that atomic-scale structural proximity effects play a crucial role in controlling the electronic phases.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Donghan Kim, Younsik Kim, Byungmin Sohn, Minsoo Kim, Bongju Kim, Tae Won Noh, Changyoung Kim
Summary: By utilizing an atomically ultra-thin SrRuO3 film, the electronic structure of a 2D van Hove singularity (VHS) is investigated and controlled using angle-resolved photoemission spectroscopy and transport properties. The 2D VHS and the sign of the charge carrier are precisely controlled by applying electric fields with alkali metal deposition and ionic-liquid gating methods. This tunable 2D VHS in an atomically flat oxide film could serve as a new strategy to achieve infinite density of states (DOS) near the Fermi level, enabling efficient tuning of electric properties.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Eun Kyo Ko, Sungsoo Hahn, Changhee Sohn, Sangmin Lee, Seung-Sup B. Lee, Byungmin Sohn, Jeong Rae Kim, Jaeseok Son, Jeongkeun Song, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong H. Kim, Changyoung Kim, Tae Won Noh
Summary: Hund's coupling, or the intra-atomic exchange, can drive novel quantum phases in multi-orbital systems, but this requires precise control of orbital occupancy. Ko et al. report an orbital-selective metal-to-insulator transition driven by Hund's physics via symmetry-preserving strain tuning in monolayer SrRuO3.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Hyeong Jun Lee, Choong H. Kim, Ara Go
Summary: In this study, a systematic investigation was conducted on the interplay between van Hove singularities and Hund's metallicity, demonstrating a significant enhancement of the latter by the former. The results suggest a synergy between van Hove singularities and Hund's coupling, providing valuable insights into the amplification of correlation-induced phenomena in crystalline solids.
Article
Physics, Multidisciplinary
Byungmin Sohn, Bongju Kim, Se Young Park, Hwan Young Choi, Jae Young Moon, Taeyang Choi, Young Jai Choi, Hua Zhou, Jun Woo Choi, Alessandro Bombardi, Dan G. Porter, Seo Hyoung Chang, Jung Hoon Han, Changyoung Kim
Summary: By investigating SrRuO3 ultrathin films, a humplike feature in the Hall effect was observed, revealing the stability and generation mechanism of this feature related to atomic rumplings enhancing the Dzyaloshinskii-Moriya interaction. Furthermore, temperature-dependent resonant x-ray measurements confirmed the correlation between intensity modulation of unexpected peaks and the hump region in the Hall effect.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Hwanbeom Cho, Choong H. Kim, Yongmoon Lee, Kazuki Komatsu, Byeong-Gwan Cho, Deok-Yong Cho, Taehun Kim, Chaebin Kim, Younghak Kim, Tae Yeong Koo, Yukio Noda, Hiroyuki Kagi, Daniel Khomskii, Donghoon Seoung, Je-Geun Park
Summary: Researchers have discovered a unique phenomenon where CuAl2O4 exhibits a J(eff) = 1/2 state with strong electron correlation, despite the relatively small spin-orbit coupling. Through experimental studies, they found a pressure-induced structural transition from the Mott insulating J(eff) = 1/2 state to the S = 1/2 state. The study provides an example of the spin-orbit entangled J(eff) state under strong electron correlation and its pressure-induced transition.