Search

Your search keyword '"Dai, Xuran"' showing total 7 results
Start Over Author "Dai, Xuran" Publication Year Range Last 3 years
7 results on '"Dai, Xuran"'

1. Observation of Ferromagnetic Phase in the Second Moir\'e Band of Twisted MoTe2

Author

An, Liheng, Pan, Haiyang, Qiu, Wen-Xuan, Wang, Naizhou, Ru, Shihao, Tan, Qinghai, Dai, Xuran, Cai, Xiangbin, Shang, Qiuyu, Lu, Xiufang, Jiang, Hao, Lyu, Xiaodan, Watanabe, Kenji, Taniguchi, Takashi, Wu, Fengcheng, and Gao, Wei-bo

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Flat bands and electron correlation in moir\'e lattices give rise to many exotic phases, including Mott insulators, superconductivity, and topological states. Within the first moir\'e band, integer and fractional quantum anomalous Hall effects have been observed in twisted bilayer MoTe2 (tMoTe2) at one hole doping and fractional doping per moir\'e unit cell, respectively. When the second moir\'e band is fully hole doped, quantum spin Hall insulator has also been reported in tMoTe2 at a certain twist angle. Exotic topological states together with ferromagnetic (FM) states in the high moir\'e band can potentially exist as well. In this study, we report the observation of a FM phase in the second moir\'e band in tMoTe2. The FM phase can be tuned by both the doping level and displacement field. At filling around 2.58 holes per moir\'e unit cell, the FM phase reaches a Curie temperature of 3.5 K. A large displacement field can suppress the FM phase, like the FM phase at the filling of -1. Our results demonstrate the realization of time-reversal symmetry-breaking states in the higher moir\'e bands in tMoTe2., Comment: Main text: 13 pages, 5 figures. Supplementary: 11 pages, 15 figures

Published
2024

3. Identification of effective alleles and haplotypes conferring pre-harvest sprouting resistance in winter wheat cultivars

Author

Huang Yiwen, Dai Xuran, Liu Hongwei, Yu Shuo, Mai Chunyan, Yu Liqiang, Yu Guangjun, Yang Li, Zhou Yang, Li Hongjie, and Zhang Hongjun

Subjects
Triticum aestivum, Pre-harvest sprouting resistance, Molecular marker-assisted selection, Functional marker, Germination index, Botany, QK1-989
Abstract

Abstract Background Pre-harvest sprouting (PHS) is a serious limiting factor for wheat (Triticum aestivum L.) grain yield and end-use quality. Identification of reliable molecular markers and PHS-resistant germplasms is vital to improve PHS resistance by molecular marker-assisted selection (MAS), but the effects of allelic variation and haplotypes in genes conferring PHS resistance in winter wheat cultivars are less understood. Results Resistance to PHS was tested in 326 commercial winter wheat cultivars for three consecutive growing seasons from 2018–2020. The effects of alleles and haplotypes of 10 genes associated with PHS resistance were determined for all cultivars and were validated by introgressing the PHS-resistance allele and haplotype into a susceptible wheat cultivar. High level of phenotypic variation in PHS resistance was observed in this set of cultivars and 8 of them were highly resistant to PHS with stable germination index (GI) of less than 25% in each individual year. Allelic effects of nine genes and TaMFT haplotype analysis demonstrated that the haplotype Hap1 with low-GI alleles at five positions had the best PHS resistance. This haplotype has the priority to use in improving PHS resistance because of its high effectiveness and rare present in the current commercial cultivars. Among 14 main allelic combinations (ACs) identified, the AC1 carrying the haplotype Hap1 and the TaSdr-B1a allele had better PHS resistance than the other classes. The introgression of Hap1 and TaSdr-B1a is able to significantly improve the PHS resistance in the susceptible cultivar Lunxuan 13. Conclusions The effectiveness of alleles conferring PHS resistance in winter wheat cultivars was determined and the useful alleles and haplotypes were identified, providing valuable information for parental selection and MAS aiming at improving PHS-resistance in winter wheat. The identification of the PHS-resistant cultivars without known resistance alleles offers an opportunity to explore new PHS-resistant genes.

Published
2022
Full Text
View/download PDF

7. Layer-dependent correlated phases in WSe2/MoS2moiré superlattice

Author

Tan, Qinghai, Rasmita, Abdullah, Zhang, Zhaowei, Cai, Hongbing, Cai, Xiangbin, Dai, Xuran, Watanabe, Kenji, Taniguchi, Takashi, MacDonald, Allan H., and Gao, Weibo

Abstract

Electron correlation plays an essential role in the macroscopic quantum phenomena in the moiré heterostructure, such as antiferromagnetism and correlated insulating phases. Unlike the phenomena where the interaction involves only electrons in one layer, the interaction of distinct phases in two or more layers represents a new horizon forward, such as the one in the Kondo lattice model. Here, using interlayer excitons as a probe, we show that the interlayer interactions in heterobilayers of tungsten diselenide and molybdenum disulfide (WSe2/MoS2) can be electrically switched on and off, resulting in a layer-dependent correlated phase diagram, including single-layer, layer-selective, excitonic-insulator and layer-hybridized regions. We demonstrate that these correlated phases affect the interlayer exciton non-radiative decay pathways. These results reveal the role of strong correlation on interlayer exciton dynamics and pave the way for studying the layer-resolved strong correlation behaviour in moiré heterostructures.

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results