Article
Chemistry, Multidisciplinary
Paul Dreher, Wen Wan, Alla Chikina, Marco Bianchi, Haojie Guo, Rishav Harsh, Samuel Manas-Valero, Eugenio Coronado, Antonio J. Martinez-Galera, Philip Hofmann, Jill A. Miwa, Miguel M. Ugeda
Summary: The study reveals that the CDW and superconducting states in single-layer NbSe2 exhibit different behaviors on different substrates, with these electronic phases remaining stable on graphene and boron nitride substrates but severely weakened or even absent on metallic substrates.
Article
Materials Science, Multidisciplinary
Estelle Mazaleyrat, Sergio Vlaic, Alexandre Artaud, Laurence Magaud, Thomas Vincent, Ana Cristina Gomez-Herrero, Simone Lisi, Priyank Singh, Nedjma Bendiab, Valerie Guisset, Philippe David, Stephane Pons, Dimitri Roditchev, Claude Chapelier, Johann Coraux
Summary: This study introduces a strategy to induce superconductivity in epitaxial graphene via a remote proximity effect using an intercalated gold layer. The experiments demonstrate a weak interaction between graphene and gold, enabling superconductivity, and reveal the main shortcoming of the intercalation approach is the creation of a high density of point defects in graphene.
Article
Physics, Multidisciplinary
Young Woo Choi, Hyoung Joon Choi
Summary: Graphene moire superlattices exhibit varying electron-phonon coupling strengths in different flat bands, showcasing a correlation between strong electron-phonon coupling and observed robust superconductivity. The presence of sublattice polarization in certain moire flat bands may suppress intersublattice electron-phonon matrix elements, potentially leading to weaker or absent superconductivity. Nonadiabatic superconducting transition temperatures T-c obtained from calculations are in good agreement with experimental results.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Robert G. Moore, Qiangsheng Lu, Hoyeon Jeon, Xiong Yao, Tyler Smith, Yun-Yi Pai, Michael Chilcote, Hu Miao, Satoshi Okamoto, An-Ping Li, Seongshik Oh, Matthew Brahlek
Summary: The interface between 2D topological Dirac states and an s-wave superconductor has the potential to support Majorana-bound states for quantum computing. The researchers demonstrate that the Fe(Te,Se)/Bi2Te3 system is highly tunable and can be used to realize Majorana-bound states with improved characteristics important for their applications. By reducing doping and improving spin-momentum locking, the desired spin-momentum-locked topological interface states (TIS) can be achieved.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yasuaki Saruta, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato
Summary: The current key challenge in 2D materials is to achieve emergent quantum phenomena in hetero structures by controlling the moire potential created by the periodicity mismatch between adjacent layers. This study demonstrates that the unstable octahedral MoTe2 can be stabilized in a commensurate MoTe2/graphene hetero-bilayer due to the moire potential between the two layers, providing a fresh approach to realize novel 2D quantum phases.
Article
Spectroscopy
Chung Koo Kim, Ilya K. Drozdov, Kazuhiro Fujita, J. C. Seamus Davis, Ivan Bozovic, Tonica Valla
Summary: ARPES is a key momentum-resolved technique for studying the electronic structure of materials. At Brookhaven National Laboratory, a new multi-module system is described that interconnects oxide molecular beam epitaxy (OMBE) with ARPES and spectroscopic-imaging scanning tunneling microscopy (SI-STM). This system greatly expands the range of complex oxides and artificial heterostructures that can be studied using these powerful techniques.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2022)
Article
Materials Science, Multidisciplinary
Zakariae El Youbi, Sung Won Jung, Christine Richter, Karol Hricovini, Cephise Cacho, Matthew D. Watson
Summary: The electronic structure of 2H and 3R polytypes of NbS2 was investigated, revealing a significant difference in band filling between the two phases due to the presence of additional interstitial Nb in 3R-Nb1-xS2. The electron-phonon coupling was found to be stronger for bands with Nb 4d(x2-y2,xy) character than for Nb 4d(3z2-r2), providing insights into the two-gap superconductivity and latent charge density wave in 2H-NbS2.
Article
Multidisciplinary Sciences
John Sous, Benedikt Kloss, Dante M. Kennes, David R. Reichman, Andrew J. Millis
Summary: By simulating the non-equilibrium dynamics of a metal driven by light pumping, researchers found rapid loss of spatial coherence leading to emergent disorder in the dynamics, which dominates electronic behavior. This study sheds light on correlation dynamics in vibrationally coupled electrons and highlights the significance of phase coherence evolution.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Ta Tang, Brian Moritz, Cheng Peng, Zhi-Xun Shen, Thomas P. Devereaux
Summary: This study demonstrates that extended electron-phonon coupling is a significant factor in generating the attractive coupling observed in one-dimensional cuprate materials, and can reproduce the spectral features and doping dependence seen in experiments.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Saisab Bhowmik, Bhaskar Ghawri, Youngju Park, Dongkyu Lee, Suvronil Datta, Radhika Soni, K. Watanabe, T. Taniguchi, Arindam Ghosh, Jeil Jung, U. Chandni
Summary: Recent experiments in magic-angle twisted bilayer graphene have revealed a variety of novel electronic phases due to interaction-driven spin-valley flavour polarisation. In this work, the authors investigate correlated phases in twisted bilayer graphene coupled to tungsten diselenide, resulting from spin-orbit coupling-enhanced valley polarisation and large density of states below half filling of the moire band. They observe an anomalous Hall effect and tuneable Lifshitz transitions, as well as revealing the orbital nature of magnetisation near half filling. The Hall resistance shows quantisation and complete valley polarisation at finite fields, indicating the stabilisation of ordered phases at non-integer moire band fillings.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Jin-Hua Nie, Tao Xie, Gang Chen, Wenhao Zhang, Ying-Shuang Fu
Summary: Recent advances in moire' superlattice engineering of two-dimensional heterostructures have enabled the enhancement of multiband superconductivity and effective control of characteristic spectra. This study provides a new approach for engineering proximitized properties of heterostructures through moire' landscape modulation.
Article
Nanoscience & Nanotechnology
Jason Lapano, Ondrej Dyck, Andrew R. Lupini, Wonhee Ko, Haoxiang Li, Hu Miao, Ho Nyung Lee, An-Ping Li, Matthew Brahlek, Stephen Jesse, Robert G. Moore
Summary: Research has shown that utilizing van der Waals epitaxial growth technique can achieve high-quality growth of layered topological insulators on freestanding monolayer graphene transferred to different mechanical supports, opening up new possibilities for creating device structures with traditional semiconductor nanofabrication techniques.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Wan-Hsin Chen, Chin-Hsuan Chen, Guan-Hao Chen, Wei-Chuan Chen, Fu-Xiang Rikudo Chen, Pei-Jung Chen, Chun-Kai Ku, Chang-Tsan Lee, Naoya Kawakami, Jia-Ying Li, Iwao Matsuda, Wen-Hao Chang, Juhn-Jong Lin, Chien-Te Wu, Chung-Yu Mou, Horng-Tay Jeng, Shu-Jung Tang, Chun-Liang Lin
Summary: In this work, a buckled plumbene-Au Kagome superstructure grown by depositing Au on Pb(111) is investigated, which not only has an enhanced superconducting critical temperature (T-c) with respect to that of a monolayer Pb but also possesses a higher value than what owned by a bulk Pb substrate. By combining angle-resolved photoemission spectroscopy with density functional theory, the monolayer Au-intercalated low-buckled plumbene sandwiched between the top Au Kagome layer and the bottom Pb(111) substrate is confirmed and the electron-phonon coupling-enhanced superconductivity is revealed. This work demonstrates that a buckled plumbene-Au Kagome superstructure can enhance superconducting T-c and Rashba effect, effectively triggering the novel properties of a plumbene.
Article
Physics, Multidisciplinary
Xun Cai, Zi-Xiang Li, Hong Yao
Summary: The study demonstrates that SSH phonons can induce AFM ordering in two-dimensional systems, and also reveals a direct quantum phase transition between VBS order and AFM phase. The phonon mechanism of AFM ordering is attributed to SSH phonons directly coupling to electron hopping processes.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Runfa Feng, Wei Wang, Changhua Bao, Zichun Zhang, Fei Wang, Hongyun Zhang, Junjie Yao, Yong Xu, Pu Yu, Shuai-Hua Ji, Chen Si, Shuyun Zhou
Summary: This study reports the selective growth of monolayer TaTe2 films with different phases and superstructures by controlling the growth temperature and post-growth annealing treatment. The different electronic structures of 1H-TaTe2 and 1T-TaTe2 films are revealed through experimental measurements and theoretical calculations. The transition from a root 19x root 19 superstructure to a new 2 x 2 superstructure is observed in the annealed 1H-TaTe2 film.
ADVANCED MATERIALS
(2023)