Article
Chemistry, Multidisciplinary
Jingjing Chen, Wenzheng Xu, Zhenbing Tan, Zhencun Pan, Pengfei Zhu, Zhi-Min Liao, Dapeng Yu
Summary: This study investigates the transport properties of a MnBi2Te4-NbN hybrid device and suggests the existence of zero-energy bound states and a topological phase transition in this system. The hybrid structure can serve as a platform for creating Majorana fermions, which holds significant scientific importance.
Article
Nanoscience & Nanotechnology
Jason Lapano, Yun-Yi Pai, Alessandro R. Mazza, Jie Zhang, Tamara Isaacs-Smith, Patrick Gemperline, Lizhi Zhang, Haoxiang Li, Ho Nyung Lee, Gyula Eres, Mina Yoon, Ryan Comes, T. Zac Ward, Benjamin J. Lawrie, Michael A. McGuire, Robert G. Moore, Christopher T. Nelson, Andrew F. May, Matthew Brahlek
Summary: Ternary chalcogenides, such as parkerites and shandites, are a class of materials exhibiting diverse transport and magnetic behavior, including Weyl and Dirac nodes. This study reports the self-regulated growth of Pd3Bi2Se2 superconductor thin films on SrTiO3, showing high structural quality and superconducting properties.
Article
Materials Science, Multidisciplinary
L. X. Xu, Y. Y. Y. Xia, S. Liu, Y. W. Li, L. Y. Wei, H. Y. Wang, C. W. Wang, H. F. Yang, A. J. Liang, K. Huang, T. Deng, W. Xia, X. Zhang, H. J. Zheng, Y. J. Chen, L. X. Yang, M. X. Wang, Y. F. Guo, G. Li, Z. K. Liu, Y. L. Chen
Summary: In this study, we propose the layered superconducting material CaSn as a WTI with nontrivial Z(2) and protected nodal-line semimetal by crystalline nonsymmorphic symmetry. Our ARPES investigation on the electronic structure agrees well with the calculation, and STM/STS observation at the surface step edge shows signatures of the expected TES. These integrated evidences strongly support the existence of TES in the nonsymmorphic nodal-line semimetal CaSn, making it a versatile material platform for multiple exotic electronic states and topological superconductivity.
Article
Materials Science, Multidisciplinary
Henry F. Legg, Daniel Loss, Jelena Klinovaja
Summary: This study investigates the effects of coupling between a superconducting layer and a topological insulator nanowire. The research shows that metallization of states in the nanowire caused by the superconductor leads to a shift of energy sub-bands and a reduction in the sub-band gap size. However, metallization effects in the nanowires can also enhance the sub-band splitting, which is crucial for achieving topological superconductivity. Unlike in semiconductors, the metallization effects in topological insulator nanowires can be relatively easily mitigated.
Article
Materials Science, Multidisciplinary
V. G. Kogan, N. Nakagawa, J. R. Kirtley
Summary: The research shows that in anisotropic superconducting films, the magnetic field generated by vortices may change sign under certain conditions, which is related to the angular dependence of the supercurrents.
Article
Multidisciplinary Sciences
Gian Marco Pierantozzi, Alessandro De Vita, Chiara Bigi, Xin Gui, Hung-Ju Tien, Debashis Mondal, Federico Mazzola, Jun Fujii, Ivana Vobornik, Giovanni Vinai, Alessandro Sala, Cristina Africh, Tien-Lin Lee, Giorgio Rossi, Tay-Rong Chang, Weiwei Xie, Robert J. Cava, Giancarlo Panaccione
Summary: The presence of long-range ferromagnetic order triggers topological invariants in EuSn2P2, while coexisting with layer-dependent spin-momentum locking, making it a prime candidate axion insulator for topological antiferromagnetic spintronics applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Shu Hsuan Su, Pei-Yu Chuang, Hsin-Yu Chen, Shih-Chang Weng, Wei-Chuan Chen, Ku-Ding Tsuei, Chao-Kuei Lee, Shih-Hsun Yu, Mitch M-C Chou, Li-Wei Tu, Horng-Tay Jeng, Chien-Ming Tu, Chih-Wei Luo, Cheng-Maw Cheng, Tay-Rong Chang, Jung-Chun Andrew Huang
Summary: The study demonstrates the topological proximity effect between antimonene and Sb2Te3, indicating the 2D material antimonene possesses a 2D topological state and forms Dirac fermions at the interface of a 2D normal insulator and a 3D topological insulator. By hydrogen etching Sb2Te3, the position of the Dirac point and shape of the Dirac surface state can be tuned, providing a new approach to create QSH systems in 2D-material TI heterostructures.
Article
Materials Science, Multidisciplinary
M. P. Smylie, Kaya Kobayashi, J. Z. Dans, H. Hebbeker, R. Chapai, W-K Kwok, U. Welp
Summary: This paper presents the study of superconducting properties of In0.8Pb0.2Te samples synthesized using high-pressure techniques on the indium-rich side. The results show fully gapped BCS-like behavior, ruling out odd-parity topologically nontrivial A(2u) pairing, but odd-parity A(1u) pairing is still possible.
Article
Physics, Multidisciplinary
Yuxin Liu, Xuefan Niu, Rencong Zhang, Qinghua Zhang, Jing Teng, Yongqing Li
Summary: An experimental study of electron transport properties of MnSe/(Bi,Sb)(2)Te-3 heterostructures was conducted, showing a strong magnetic proximity effect on the Hall effect and longitudinal resistances. The gate voltage was found to significantly modify the anomalous Hall conductance, indicating that heterostructures based on antiferromagnetic insulators provide a promising platform for investigating a wide range of topological spintronic phenomena.
CHINESE PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Yi Zhang, Shengshan Qin, Kun Jiang, Jiangping Hu
Summary: We find that the vortex bound states in superconducting topological semimetals are gapless due to topological massless excitations in their normal states. This universal result is demonstrated in various semimetals, including Dirac and Weyl semimetals, three-fold degenerate spin-1 fermions, spin-3/2 Rarita-Schwinger-Weyl fermion semimetals and other exotic fermion semimetals. The formation of these gapless bound states is closely related to their Andreev specular reflection and propagating Andreev modes in pi-phase superconductor-normal metal-superconductor junctions. We further demonstrate that these gapless states are topologically protected and can be derived from a topological pumping process.
NATIONAL SCIENCE REVIEW
(2023)
Article
Materials Science, Multidisciplinary
T. H. Kokkeler, A. A. Golubov, F. S. Bergeret
Summary: We study the transport properties of a diffusive Josephson junction between superconductors and ferromagnetic insulators on a three-dimensional topological insulator. We analyze the Usadel equation and find the appearance of an anomalous phase in the absence of an external magnetic field. We also explore nonreciprocal electronic transport and calculate the diode efficiency of the junction, showing a significant effect even without an applied magnetic field and a nonmonotonic behavior with temperature.
Article
Physics, Applied
Yunlong Li, Zhao Ran, Wenxiang Jiang, Qiang Jing, Jiayuan Hu, Weidong Luo, Dong Qian
Summary: By using high-resolution angle-resolved photoemission spectroscopy, the surface state of Ta3SiTe6 was studied, revealing it to be topologically trivial with an anisotropic Fermi surface topology.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Vasily S. Stolyarov, Stephane Pons, Sergio Vlaic, Sergey Remizov, Dmitriy S. Shapiro, Christophe Brun, Sergey Bozhko, Tristan Cren, Tatiana Menshchikova, Evgueni Chulkov, Walter Pogosov, Yuriy E. Lozovik, Dimitri Roditchev
Summary: The superconducting nanohybrids formed by Pb on the surface of Bi2Te3 exhibit a thickness-dependent superconducting gap for Pb-islands and a position-independent proximity gap. The wetting layer of Pb leads to modifications of electronic states of Bi2Te3, resulting in a long-range proximity effect.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Reena Yadav, Biplab Bhattacharyya, Animesh Pandey, Mandeep Kaur, Anurag Gupta, Sudhir Husale
Summary: This paper investigates the induced superconductivity in Bi2Se3 flakes through electric transport measurements in a hybrid structure composed of Bi2Se3 topological insulator thin flakes and tungsten (W) superconducting electrodes. The resistance of the flakes decreases significantly when the electrodes become superconducting, even when the length of the flakes exceeds the superconducting coherence length. Additionally, the magnetoresistance of the flakes changes from negative to positive above the transition temperature due to the effects of the superconducting electrodes.
Article
Chemistry, Multidisciplinary
Hongxiang Chen, Jiacheng Gao, Long Chen, Gang Wang, Hang Li, Yulong Wang, Juanjuan Liu, Jinchen Wang, Daiyu Geng, Qinghua Zhang, Jieming Sheng, Feng Ye, Tian Qian, Lan Chen, Hongming Weng, Jie Ma, Xiaolong Chen
Summary: This study presents the hourglass fermion surface state and exotic phases in the newly discovered ErAsS single crystals. In the paramagnetic phase, ErAsS is expected to be a TCI with hourglass fermion surface state, which is experimentally confirmed by observed band structures. Below a certain temperature, ErAsS enters a collinear antiferromagnetic state, and an intermediate incommensurate magnetic state appears in a narrow temperature range.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Abdullah Albagami, Sharad Ambardar, Hana Hrim, Prasana K. Sahoo, Yusuf Emirov, Humberto R. Gutierrez, Dmitri V. Voronine
Summary: In this study, the photoluminescence (PL) signals of strained 2D nanobubbles were investigated using near-field scanning probe microscopy (SPM). The tunability of PL was observed, providing new possibilities for designing optoelectronic nanodevices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Varun Mapara, Arup Barua, Volodymyr Turkowski, M. Tuan Trinh, Christopher Stevens, Hengzhou Liu, Florence A. Nugera, Nalaka Kapuruge, Humberto Rodriguez Gutierrez, Fang Liu, Xiaoyang Zhu, Dmitry Semenov, Stephen A. McGill, Nihar Pradhan, David J. Hilton, Denis Karaiskaj
Summary: Magnetic field can control the behavior of bright and dark excitons in monolayer WSe2. When the magnetic field is parallel to the WSe2 plane, the lower energy exciton becomes brighter and the dephasing time increases. When the magnetic field is perpendicular to the WSe2 plane, the bright and dark excitons energetically shift and hybridize with each other.
Article
Chemistry, Multidisciplinary
Florence A. Nugera, Prasana K. Sahoo, Yan Xin, Sharad Ambardar, Dmitri V. Voronine, Un Jeong Kim, Yoojoong Han, Hyungbin Son, Humberto R. Gutierrez
Summary: Monolayer and bilayer lateral heterostructures based on ternary alloys of MoS2(1-x)Se2x-WS2(1-x)Se2x were successfully synthesized by modifying the ratio of the source precursors. The bandgaps of both materials in the heterostructure can be continuously tuned, and good intradomain composition homogeneity was observed. The band alignments in different heterostructures depend on the composition and can be affected by unintentional electronic doping during growth.
Article
Materials Science, Multidisciplinary
Run Xiao, Jacob T. Held, Jeffrey Rable, Supriya Ghosh, Ke Wang, K. Andre Mkhoyan, Nitin Samarth
Summary: Magnetic doping of topological quantum materials provides an attractive method for studying the effects of time reversal symmetry breaking. The introduction of transition metal Mn into Cd3As2 films shows the formation of a Mn-rich phase at the top surface, indicating that Mn acts as a surfactant during epitaxial growth of Cd3As2.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Multidisciplinary
Lauren J. Riddiford, Alexander J. Grutter, Timothy Pillsbury, Max Stanley, Danielle Reifsnyder Hickey, Peng Li, Nasim Alem, Nitin Samarth, Yuri Suzuki
Summary: We have studied magnetic insulator-topological insulator heterostructures and identified a possible magnetic proximity effect in MgAl0.5Fe1.5O4/Bi2Se3 bilayers. Electrical transport and polarized neutron reflectometry confirm the existence of a magnetic proximity effect, while structural data reveal the disordered interface as the origin of the magnetic response.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Hemian Yi, Lun-Hui Hu, Yuanxi Wang, Run Xiao, Jiaqi Cai, Danielle Reifsnyder Hickey, Chengye Dong, Yi-Fan Zhao, Ling-Jie Zhou, Ruoxi Zhang, Anthony R. Richardella, Nasim Alem, Joshua A. Robinson, Moses H. W. Chan, Xiaodong Xu, Nitin Samarth, Chao-Xing Liu, Cui-Zu Chang
Summary: The change in film thickness of Bi2Se3 can induce a transition from Ising to Rashba-type superconducting pairings, providing a new approach for studying topological superconductivity.
Article
Physics, Applied
Wilson Yanez, Yongxi Ou, Run Xiao, Supriya Ghosh, Jyotirmay Dwivedi, Emma Steinebronn, Anthony Richardella, K. Andre Mkhoyan, Nitin Samarth
Summary: This study reports on the measurement of efficient charge-to-spin conversion at room temperature in Weyl semimetal-ferromagnet heterostructures with both oxidized and pristine interfaces, and compares the impact of these two different interfaces.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Sadashige Matsuo, Joon Sue Lee, Chien-Yuan Chang, Yosuke Sato, Kento Ueda, Christopher J. Palmstrom, Seigo Tarucha
Summary: This study reports the observation of nonlocal Josephson effects on double InAs nanowires, providing experimental evidence of short-range coherent coupling. By measuring the current oscillation of one Josephson junction sharing a superconducting electrode with another junction, the authors demonstrate control of nonlocal phase difference and contribute to the engineering of novel superconducting phenomena. Josephson junctions have applications in quantum circuits, but the challenge lies in producing and controlling the coupling between junctions.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Condensed Matter
Yoojoong Han, Un Jeong Kim, Florence A. A. Nugera, Seok In Kim, Yeonsang Park, Miyeon Cheon, Gun Cheol Kim, Humberto R. R. Gutierrez, Moonsang Lee, Hyungbin Son
Summary: Binary and ternary transition metal dichalcogenide (TMD) heterostructures, MoSe2 and MoSeS, are investigated as building blocks for high-performance devices with adjustable electronic bandgap. Time-resolved photoluminescence (TRPL) is used to measure the decay times of these heterostructures, and a tri-exponential function is adopted to fit the data. The decay times are classified into short, medium, and long categories, and PL decay time maps are successfully obtained using the center-of-mass (CM) method for qualitative visualization.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Physics, Applied
Jeffrey Rable, Benjamin Piazza, Jyotirmay Dwivedi, Nitin Samarth
Summary: Nitrogen-vacancy centers in diamond have been proven effective in sensing the magnetization dynamics in nearby ferromagnetic materials. Researchers have demonstrated high placement accuracy of nitrogen-vacancy-containing nanodiamonds and used them as local sensors to detect optically detected ferromagnetic resonance in mesoscopically patterned Permalloy islands. The measurements revealed variations in the ferromagnetic resonance signal at different sites, showing distinct behavior at the edge and bulk of the patterned features.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Run Xiao, Saurav Islam, Wilson Yanez, Yongxi Ou, Haiwen Liu, Xincheng Xie, Juan Chamorro, Tyrel M. McQueen, Nitin Samarth
Summary: Time-reversal invariance and inversion symmetry are responsible for the topological band structure in Dirac semimetals. Applying an external magnetic or electric field can break these symmetries and cause fundamental changes to the ground state Hamiltonian and a topological phase transition. We use universal conductance fluctuations in Cd3As2 to probe these changes. The magnitude of the fluctuations decreases with increasing magnetic field, consistent with the effect of broken time-reversal invariance. However, the magnitude increases monotonically when the chemical potential is gated away from the charge neutrality point, attributed to Fermi surface anisotropy rather than broken inversion symmetry. The agreement between experimental data and theory provides unequivocal evidence that universal conductance fluctuations are the dominant source of fluctuations and offers a general methodology for probing broken-symmetry effects in topological quantum materials.
Article
Chemistry, Multidisciplinary
Chang-Ming Hung, Diem Thi-Xuan Dang, Amit Chanda, Derick Detellem, Noha Alzahrani, Nalaka Kapuruge, Yen T. H. Pham, Mingzu Liu, Da Zhou, Humberto R. Gutierrez, Dario A. Arena, Mauricio Terrones, Sarath Witanachchi, Lilia M. Woods, Hariharan Srikanth, Manh-Huong Phan
Summary: The magnetic proximity effect (MPE) in Pt/WS2/BPIO heterostructures has been investigated in this study. It is found that monolayer WS2 flakes reduce the magnetization of BPIO above a certain temperature, but enhance it below that temperature. A comparative analysis of transport properties reveals ferromagnetic coupling at the WS2/BPIO interface. This study provides a foundation for understanding MPE-mediated interfacial properties and offers a new pathway for designing 2D TMD/magnet heterostructures for spintronics, opto-spincaloritronics, and valleytronics.
Article
Materials Science, Multidisciplinary
Fan Zhang, Asmaul Smitha Rashid, Mostafa Tanhayi Ahari, Wei Zhang, Krishnan Mekkanamkulam Ananthanarayanan, Run Xiao, George J. de Coster, Matthew J. Gilbert, Nitin Samarth, Morteza Kayyalha
Summary: There is a growing interest in using multiterminal Josephson junctions to emulate topological phases and investigate superconducting mechanisms. However, the interpretation of experimental signatures in MTJJs has been conflicting. In this study, graphene-based four-terminal Josephson junctions were investigated experimentally and theoretically. Resonant features in the differential resistance maps were observed and successfully reproduced using a circuit network model. The study suggests that differential resistance measurements alone cannot distinguish resonant Andreev reflection processes from semiclassical circuit-network effects.
Article
Multidisciplinary Sciences
Andres Castellanos-Gomez, Xiangfeng Duan, Zhe Fei, Humberto Rodriguez Gutierrez, Yuan Huang, Xinyu Huang, Jorge Quereda, Qi Qian, Eli Sutter, Peter Sutter
Summary: The integration of dissimilar materials into heterostructures has become a powerful tool for engineering interfaces and electronic structure. This Primer provides an overview of state-of-the-art methodologies for producing van der Waals heterostructures, focusing on top-down assembly and bottom-up synthesis, and discusses future opportunities for their continued development.
NATURE REVIEWS METHODS PRIMERS
(2022)
Article
Materials Science, Multidisciplinary
Run Xiao, Junyi Zhang, Juan Chamorro, Jinwoong Kim, Tyrel M. McQueen, David Vanderbilt, Morteza Kayyalha, Yi Li, Nitin Samarth
Summary: We investigated the integer quantum Hall effect in Cd3As2 thin films with strong to moderate quantum confinement. We observed the effect not only in the spin-polarized lowest Landau level (filling factor v = 1), but also in the spin-degenerate higher index Landau levels with even filling factors (v = 2, 4, 6). As the quantum confinement increased, we also observed a lifting of the Landau-level spin degeneracy at v = 3, which manifested as an anomaly in the longitudinal and Hall resistivities.
