13 results on '"Min, L."'
Search Results
2. High-entropy engineering of the crystal and electronic structures in a Dirac material.
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Laha A, Yoshida S, Marques Dos Santos Vieira F, Yi H, Lee SH, Ayyagari SVG, Guan Y, Min L, Gonzalez Jimenez J, Miao L, Graf D, Sarker S, Xie W, Alem N, Gopalan V, Chang CZ, Dabo I, and Mao Z
- Abstract
Dirac and Weyl semimetals are a central topic of contemporary condensed matter physics, and the discovery of new compounds with Dirac/Weyl electronic states is crucial to the advancement of topological materials and quantum technologies. Here we show a widely applicable strategy that uses high configuration entropy to engineer relativistic electronic states. We take the AMnSb
2 (A = Ba, Sr, Ca, Eu, and Yb) Dirac material family as an example and demonstrate that mixing of Ba, Sr, Ca, Eu and Yb at the A site generates the compound (Ba0.38 Sr0.14 Ca0.16 Eu0.16 Yb0.16 )MnSb2 (denoted as A5 MnSb2 ), giving access to a polar structure with a space group that is not present in any of the parent compounds. A5 MnSb2 is an entropy-stabilized phase that preserves its linear band dispersion despite considerable lattice disorder. Although both A5 MnSb2 and AMnSb2 have quasi-two-dimensional crystal structures, the two-dimensional Dirac states in the pristine AMnSb2 evolve into a highly anisotropic quasi-three-dimensional Dirac state triggered by local structure distortions in the high-entropy phase, which is revealed by Shubnikov-de Haas oscillations measurements., (© 2024. The Author(s).)- Published
- 2024
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3. Hidden non-collinear spin-order induced topological surface states.
- Author
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Huang Z, Yi H, Kaplan D, Min L, Tan H, Chan YT, Mao Z, Yan B, Chang CZ, and Wu W
- Abstract
Rare-earth monopnictides are a family of materials simultaneously displaying complex magnetism, strong electronic correlation, and topological band structure. The recently discovered emergent arc-like surface states in these materials have been attributed to the multi-wave-vector antiferromagnetic order, yet the direct experimental evidence has been elusive. Here we report observation of non-collinear antiferromagnetic order with multiple modulations using spin-polarized scanning tunneling microscopy. Moreover, we discover a hidden spin-rotation transition of single-to-multiple modulations 2 K below the Néel temperature. The hidden transition coincides with the onset of the surface states splitting observed by our angle-resolved photoemission spectroscopy measurements. Single modulation gives rise to a band inversion with induced topological surface states in a local momentum region while the full Brillouin zone carries trivial topological indices, and multiple modulation further splits the surface bands via non-collinear spin tilting, as revealed by our calculations. The direct evidence of the non-collinear spin order in NdSb not only clarifies the mechanism of the emergent topological surface states, but also opens up a new paradigm of control and manipulation of band topology with magnetism., (© 2024. The Author(s).)
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- 2024
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4. Frequency-selective perovskite photodetector for anti-interference optical communications.
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Min L, Sun H, Guo L, Wang M, Cao F, Zhong J, and Li L
- Abstract
Free-space coupling, essential for various communication applications, often faces significant signal loss and interference from ambient light. Traditional methods rely on integrating complex optical and electronic systems, leading to bulkier and costlier communication equipment. Here, we show an asymmetric 2D-3D-2D perovskite structure device to achieve a frequency-selective photoresponse in a single device. By combining two electromotive forces of equal magnitude in the opposite directions, the device output is attenuated to zero under constant light illumination. Because these reverse photodiodes have different response speeds, the device only responds near a certain frequency, which can be tuned by manipulating the 2D perovskite components. The target device achieves an ultrafast response of 19.7/18.3 ns in the frequency-selective photoresponse range 0.8-9.7 MHz. This anti-interference photodetector can accurately transmit character and video data under strong light interference with a source intensity of up to 454 mW cm
-2 ., (© 2024. The Author(s).)- Published
- 2024
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5. Strong electron-phonon coupling driven pseudogap modulation and density-wave fluctuations in a correlated polar metal.
- Author
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Wang HH, Xiong Y, Padma H, Wang Y, Wang Z, Claes R, Brunin G, Min L, Zu R, Wetherington MT, Wang Y, Mao Z, Hautier G, Chen LQ, Dabo I, and Gopalan V
- Abstract
There is tremendous interest in employing collective excitations of the lattice, spin, charge, and orbitals to tune strongly correlated electronic phenomena. We report such an effect in a ruthenate, Ca
3 Ru2 O7 , where two phonons with strong electron-phonon coupling modulate the electronic pseudogap as well as mediate charge and spin density wave fluctuations. Combining temperature-dependent Raman spectroscopy with density functional theory reveals two phonons, B2 P and B2 M , that are strongly coupled to electrons and whose scattering intensities respectively dominate in the pseudogap versus the metallic phases. The B2 P squeezes the octahedra along the out of plane c-axis, while the B2 M elongates it, thus modulating the Ru 4d orbital splitting and the bandwidth of the in-plane electron hopping; Thus, B2 P opens the pseudogap, while B2 M closes it. Moreover, the B2 phonons mediate incoherent charge and spin density wave fluctuations, as evidenced by changes in the background electronic Raman scattering that exhibit unique symmetry signatures. The polar order breaks inversion symmetry, enabling infrared activity of these phonons, paving the way for coherent light-driven control of electronic transport., (© 2023. Springer Nature Limited.)- Published
- 2023
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6. Strong room-temperature bulk nonlinear Hall effect in a spin-valley locked Dirac material.
- Author
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Min L, Tan H, Xie Z, Miao L, Zhang R, Lee SH, Gopalan V, Liu CX, Alem N, Yan B, and Mao Z
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- Temperature, Microwaves, Physics, Cold Temperature, Fruit
- Abstract
Nonlinear Hall effect (NLHE) is a new type of Hall effect with wide application prospects. Practical device applications require strong NLHE at room temperature (RT). However, previously reported NLHEs are all low-temperature phenomena except for the surface NLHE of TaIrTe
4 . Bulk RT NLHE is highly desired due to its ability to generate large photocurrent. Here, we show the spin-valley locked Dirac state in BaMnSb2 can generate a strong bulk NLHE at RT. In the microscale devices, we observe the typical signature of an intrinsic NLHE, i.e. the transverse Hall voltage quadratically scales with the longitudinal current as the current is applied to the Berry curvature dipole direction. Furthermore, we also demonstrate our nonlinear Hall device's functionality in wireless microwave detection and frequency doubling. These findings broaden the coupled spin and valley physics from 2D systems into a 3D system and lay a foundation for exploring bulk NLHE's applications., (© 2023. The Author(s).)- Published
- 2023
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7. Rapid de novo evolution of lysis genes in single-stranded RNA phages.
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Chamakura KR, Tran JS, O'Leary C, Lisciandro HG, Antillon SF, Garza KD, Tran E, Min L, and Young R
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- Escherichia coli virology, Levivirus pathogenicity, Mutagenesis, Site-Directed, Mutation, RNA, Viral genetics, Viral Proteins genetics, Bacteriolysis genetics, Evolution, Molecular, Genes, Viral genetics, Levivirus genetics, Viral Proteins metabolism
- Abstract
Leviviruses are bacteriophages with small single-stranded RNA genomes consisting of 3-4 genes, one of which (sgl) encodes a protein that induces the host to undergo autolysis and liberate progeny virions. Recent meta-transcriptomic studies have uncovered thousands of leviviral genomes, but most of these lack an annotated sgl, mainly due to the small size, lack of sequence similarity, and embedded nature of these genes. Here, we identify sgl genes in 244 leviviral genomes and functionally characterize them in Escherichia coli. We show that leviviruses readily evolve sgl genes and sometimes have more than one per genome. Moreover, these genes share little to no similarity with each other or to previously known sgl genes, thus representing a rich source for potential protein antibiotics.
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- 2020
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8. Author Correction: Giant room temperature anomalous Hall effect and tunable topology in a ferromagnetic topological semimetal Co 2 MnAl.
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Li P, Koo J, Ning W, Li J, Miao L, Min L, Zhu Y, Wang Y, Alem N, Liu CX, Mao Z, and Yan B
- Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
- Published
- 2020
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9. Giant room temperature anomalous Hall effect and tunable topology in a ferromagnetic topological semimetal Co 2 MnAl.
- Author
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Li P, Koo J, Ning W, Li J, Miao L, Min L, Zhu Y, Wang Y, Alem N, Liu CX, Mao Z, and Yan B
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Weyl semimetals exhibit unusual surface states and anomalous transport phenomena. It is hard to manipulate the band structure topology of specific Weyl materials. Topological transport phenomena usually appear at very low temperatures, which sets challenges for applications. In this work, we demonstrate the band topology modification via a weak magnetic field in a ferromagnetic Weyl semimetal candidate, Co
2 MnAl, at room temperature. We observe a tunable, giant anomalous Hall effect (AHE) induced by the transition involving Weyl points and nodal rings. The AHE conductivity is as large as that of a 3D quantum AHE, with the Hall angle (ΘH ) reaching a record value ([Formula: see text]) at the room temperature among magnetic conductors. Furthermore, we propose a material recipe to generate large AHE by gaping nodal rings without requiring Weyl points. Our work reveals an intrinsically magnetic platform to explore the interplay between magnetic dynamics and topological physics for developing spintronic devices.- Published
- 2020
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10. MKL1-actin pathway restricts chromatin accessibility and prevents mature pluripotency activation.
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Hu X, Liu ZZ, Chen X, Schulz VP, Kumar A, Hartman AA, Weinstein J, Johnston JF, Rodriguez EC, Eastman AE, Cheng J, Min L, Zhong M, Carroll C, Gallagher PG, Lu J, Schwartz M, King MC, Krause DS, and Guo S
- Subjects
- Actin Cytoskeleton metabolism, Animals, Cell Differentiation, Cell Nucleus metabolism, Cytoskeleton metabolism, Female, Fibroblasts cytology, Fluorescence Resonance Energy Transfer, Genotype, Green Fluorescent Proteins metabolism, Male, Mice, Oncogene Proteins, Fusion metabolism, Pluripotent Stem Cells cytology, Cellular Reprogramming, Chromatin chemistry, Trans-Activators metabolism
- Abstract
Actin cytoskeleton is well-known for providing structural/mechanical support, but whether and how it regulates chromatin and cell fate reprogramming is far less clear. Here, we report that MKL1, the key transcriptional co-activator of many actin cytoskeletal genes, regulates genomic accessibility and cell fate reprogramming. The MKL1-actin pathway weakens during somatic cell reprogramming by pluripotency transcription factors. Cells that reprogram efficiently display low endogenous MKL1 and inhibition of actin polymerization promotes mature pluripotency activation. Sustained MKL1 expression at a level seen in typical fibroblasts yields excessive actin cytoskeleton, decreases nuclear volume and reduces global chromatin accessibility, stalling cells on their trajectory toward mature pluripotency. In addition, the MKL1-actin imposed block of pluripotency can be bypassed, at least partially, when the Sun2-containing linker of the nucleoskeleton and cytoskeleton (LINC) complex is inhibited. Thus, we unveil a previously unappreciated aspect of control on chromatin and cell fate reprogramming exerted by the MKL1-actin pathway.
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- 2019
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11. Cyclin K regulates prereplicative complex assembly to promote mammalian cell proliferation.
- Author
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Lei T, Zhang P, Zhang X, Xiao X, Zhang J, Qiu T, Dai Q, Zhang Y, Min L, Li Q, Yin R, Ding P, Li N, Qu Y, Mu D, Qin J, Zhu X, Xiao ZX, and Li Q
- Subjects
- Animals, Breast Neoplasms metabolism, Breast Neoplasms pathology, Carcinogenesis metabolism, Carcinogenesis pathology, Cell Proliferation, Cyclin E genetics, Cyclin E metabolism, Cyclin-Dependent Kinase 2 genetics, Cyclin-Dependent Kinase 2 metabolism, Cyclin-Dependent Kinases metabolism, Cyclins antagonists & inhibitors, Cyclins metabolism, Female, Fibroblasts cytology, Fibroblasts metabolism, G2 Phase Cell Cycle Checkpoints genetics, Genomic Instability, HCT116 Cells, Humans, Mice, Mice, Inbred C57BL, NIH 3T3 Cells, Oncogene Proteins genetics, Oncogene Proteins metabolism, Primary Cell Culture, RNA, Small Interfering genetics, RNA, Small Interfering metabolism, S Phase Cell Cycle Checkpoints genetics, Breast Neoplasms genetics, Carcinogenesis genetics, Cyclin-Dependent Kinases genetics, Cyclins genetics, G1 Phase Cell Cycle Checkpoints genetics
- Abstract
The assembly of prereplicative complex (pre-RC) during G1 phase must be tightly controlled to sustain cell proliferation and maintain genomic stability. Mechanisms to prevent pre-RC formation in G2/M and S phases are well appreciated, whereas how cells ensure efficient pre-RC assembly during G1 is less clear. Here we report that cyclin K regulates pre-RC formation. We find that cyclin K expression positively correlates with cell proliferation, and knockdown of cyclin K or its cognate kinase CDK12 prevents the assembly of pre-RC in G1 phase. Mechanistically we uncover that cyclin K promotes pre-RC assembly by restricting cyclin E1 activity in G1. We identify a cyclin K-dependent, novel phosphorylation site in cyclin E1 that disrupts its interaction with CDK2. Importantly, this antagonistic relationship is largely recapitulated in cyclin E1-overexpressing tumors. We discuss the implications of our findings in light of recent reports linking cyclin K and CDK12 to human tumorigenesis.
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- 2018
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12. Dynamic air/liquid pockets for guiding microscale flow.
- Author
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Hou X, Li J, Tesler AB, Yao Y, Wang M, Min L, Sheng Z, and Aizenberg J
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Microscale flows of fluids are mainly guided either by solid matrices or by liquid-liquid interfaces. However, the solid matrices are plagued with persistent fouling problems, while liquid-liquid interfaces are limited to low-pressure applications. Here we report a dynamic liquid/solid/gas material containing both air and liquid pockets, which are formed by partially infiltrating a porous matrix with a functional liquid. Using detailed theoretical and experimental data, we show that the distribution of the air- and liquid-filled pores is responsive to pressure and enables the formation and instantaneous recovery of stable liquid-liquid interfaces that sustain a wide range of pressures and prevent channel contamination. This adaptive design is demonstrated for polymeric materials and extended to metal-based systems that can achieve unmatched mechanical and thermal stability. Our platform with its unique adaptive pressure and antifouling capabilities may offer potential solutions to flow control in microfluidics, medical devices, microscale synthesis, and biological assays.
- Published
- 2018
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13. Cotton cytochrome P450 CYP82D regulates systemic cell death by modulating the octadecanoid pathway.
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Sun L, Zhu L, Xu L, Yuan D, Min L, and Zhang X
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- Base Sequence, Cell Death, Cyclopentanes metabolism, Cytochrome P-450 Enzyme System genetics, Gossypium genetics, Lipoxygenase metabolism, Molecular Sequence Data, Oxylipins metabolism, Phenotype, Plant Proteins genetics, Salicylic Acid metabolism, Cytochrome P-450 Enzyme System metabolism, Fatty Acids metabolism, Gossypium metabolism, Plant Proteins metabolism
- Abstract
Plant oxylipins are derived from unsaturated fatty acids and play roles in plant growth and development as well as defence. Although recent studies have revealed that fatty acid metabolism is involved in systemic acquired resistance, the precise function of oxylipins in plant defence remains unknown. Here we report a cotton P450 gene SILENCE-INDUCED STEM NECROSIS (SSN), RNAi suppression of which causes a lesion mimic phenotype. SSN is also involved in jasmonate metabolism and the response to wounding. Fatty acid and oxylipin metabolite analysis showed that SSN overexpression causes hyperaccumulation of hydroxide and ketodiene fatty acids and reduced levels of 18:2 fatty acids, whereas silencing causes an imbalance in LOX (lipoxygenase) expression and excessive hydroperoxide fatty acid accumulation. We also show that an unknown oxylipin-derived factor is a putative mobile signal required for systemic cell death and hypothesize that SSN acts as a valve to regulate HR on pathogen infection.
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- 2014
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