兰州大学机构库研究单元&专题: 物理科学与技术学院
<p><span style="color:#333333; font-family:楷体,arial,helvetica,sans-serif; font-size:large"> </span><span style="color:#333333; font-family:楷体,arial,helvetica,sans-serif; font-size:large">兰州大学物理科学与技术学院下设2个系,11个研究所,1个教学实验中心。有物理学博士后科研流动站、物理学一级学科博士点;理论物理、凝聚态物理、材料物理与化学、微电子学与固体电子学4个二级学科博士点;理论物理、凝聚态物理、材料物理与化学、微电子学与固体电子学、光学、材料学、高等物理教育、计算物理8个硕士点;有物理学国家基础科学研究和教学人才培养基地、磁学与磁性材料教育部重点实验室。现设有2个“长江学者”特聘教授岗位。 </span></p>
http:///ir.lzu.edu.cn/:80/handle/262010/2
2024-03-29T07:28:45Z
2024-03-29T07:28:45Z
An oriented Ni-Co-MOF anchored on solution-free 1D CuO: a p-n heterojunction for supercapacitive energy storage (vol 9, pg 17790, 2021)
Hussain, Iftikhar
http:///ir.lzu.edu.cn/:80/handle/262010/584056
2024-03-19T01:04:51Z
2024-03-19T01:04:50Z
题名: An oriented Ni-Co-MOF anchored on solution-free 1D CuO: a p-n heterojunction for supercapacitive energy storage (vol 9, pg 17790, 2021)
作者: Hussain, Iftikhar
摘要: Correction for 'An oriented Ni-Co-MOF anchored on solution-free 1D CuO: a p-n heterojunction for supercapacitive energy storage' by Iftikhar Hussain et al., J. Mater. Chem. A, 2021, 9, 17790-17800, https://doi.org/10.1039/D1TA04855D.
2024-03-19T01:04:50Z
Molecular states with two heavy quarks
Li, Ning
Sun, Zhi-Feng
Liu, Xing
Zhu, Shi-Lin
http:///ir.lzu.edu.cn/:80/handle/262010/583821
2024-03-15T02:33:03Z
2024-03-15T02:33:02Z
题名: Molecular states with two heavy quarks
作者: Li, Ning; Sun, Zhi-Feng; Liu, Xing; Zhu, Shi-Lin
摘要: Within the one-boson-exchange (OBE) potential model, we perform a coupled-channel study of the possible deuteron-like molecular states with two heavy flavor quarks. In our study, we take into account the S-D mixing and the coupled-channel effect in the flavor space. Interestingly, we predict some molecular states which are suggested to be searched for in the further experiments. © The Authors.
2024-03-15T02:33:02Z
Pulsed magnetization reversal in Ni nanowire
Li, Huaidong
Ma, Yunxu
Liu, Qingfang
http:///ir.lzu.edu.cn/:80/handle/262010/583783
2024-03-15T02:27:59Z
2024-03-15T02:27:59Z
题名: Pulsed magnetization reversal in Ni nanowire
作者: Li, Huaidong; Ma, Yunxu; Liu, Qingfang
摘要: Pulsed magnetic field-induced magnetization reversal in Ni nanowires is investigated using micromagnetic simulation. The pulse amplitude, duration, and size of the nanowire are proven to have substantial impacts on the magnetization reversal process. Increasing pulse amplitude and duration leads to faster magnetization reversal for 10 nm-diameter nanowires. But for 40 nm-diameter nanowires with the same aspect ratio, the pulse parameters have a complicated influence on the magnetization reversal process due to the formation and propagation of magnetic domain walls. Further investigations reveal that applying a pulsed field at a certain angle from the long axis of the nanowire or raising the temperature can significantly accelerate the magnetization reversal process. © 2024 Elsevier B.V.
2024-03-15T02:27:59Z
Microwave magnetic properties of twisting structure in artificial ferrimagnet Py/Gd multilayers
Xu, Jie
Liu, Fu
Zhao, Yibing
Jin, Ying
Liang, Bokai
Jiang, Changjun
http:///ir.lzu.edu.cn/:80/handle/262010/583774
2024-03-15T02:27:37Z
2024-03-15T02:27:37Z
题名: Microwave magnetic properties of twisting structure in artificial ferrimagnet Py/Gd multilayers
作者: Xu, Jie; Liu, Fu; Zhao, Yibing; Jin, Ying; Liang, Bokai; Jiang, Changjun
摘要: The noncollinear magnetic structure is attracting significant attention owing to its abundant characteristics as well as its potential applications in spintronic devices. In this work, the magnetic characteristics for an artificial ferrimagnetic Py/Gd multilayer system having the magnetic twisted state were investigated. With an increasing thickness (1.4 to 4 nm) of the Gd layer (tGd), the effective magnetization decreased initially until tGd = 2.5 nm and then increased, which was found to be induced by the change of magnetic twisted state due to antiferromagnetic coupling between Py and Gd. Moreover, the effective Gilbert damping factor was found to be completely opposite to the effective magnetization with increasing tGd. Our results provided detailed insights into the microwave magnetic properties of an artificial ferrimagnet with a noncollinear magnetic structure that provides alternative material in the application of spintronic devices © 2024
2024-03-15T02:27:37Z
Non-destructive spectroscopic investigation of n-type 4H-SiC defects irradiated with low fluence 16.5 MeV/u Ta ions
Mao, Bangyao
Zhao, Guijuan
Lv, Xiurui
Wang, Xingliang
Wei, Wanting
Liu, Guipeng
Liu, Jiande
Liu, Linsheng
http:///ir.lzu.edu.cn/:80/handle/262010/583767
2024-03-15T02:27:12Z
2024-03-15T02:27:11Z
题名: Non-destructive spectroscopic investigation of n-type 4H-SiC defects irradiated with low fluence 16.5 MeV/u Ta ions
作者: Mao, Bangyao; Zhao, Guijuan; Lv, Xiurui; Wang, Xingliang; Wei, Wanting; Liu, Guipeng; Liu, Jiande; Liu, Linsheng
摘要: SiC-based devices are extensively utilized in environments subject to radiation, where high-fluence irradiation causes amorphization and chemical reordering in 4H-SiC. In this paper, we examine the evolution of defects in nitrogen-doped, n-type surface region of 4H-SiC at room temperature by exposing it to 16.5 MeV/u Ta ion irradiation at low fluences (108~1010 cm-2). Atomic force microscopy (AFM) imaging reveals elongated protrusions on the surface of the 4H-SiC resulting from irradiation, and the root means square (RMS) increases to 1.3 nm, 2.7 nm and 2.9 nm with increasing irradiation fluence. In the x-ray photoelectron spectroscopy (XPS) spectra, the Si-C bond decreases, while the Si-O-C bond, C-O bond, and O’ increase with increasing irradiation fluence. Based on photoluminescence (PL) spectra and Raman spectra, we suggest that the defects present in the irradiated SiC with low fluence Ta ion mainly consist of C vacancies and their complexes, and a small amount of disordered Si-Si bond. In summary, the C atoms of SiC are more likely to collide away from their original positions, leading to Si-C bond breaks. As the irradiation fluence increases, Si and O atoms will occupy these vacancies and form relevant defects. IEEE
2024-03-15T02:27:11Z
An Ultra-Wideband, Wide-Angle and Transparent Microwave Absorber Using Indium Tin Oxide Conductive Films
Bai, Xiaolei
Mei, Zhonglei
Zhang, Jingwei
Xu, Wenbo
Lin, Weijiong
Niu, Tiaoming
http:///ir.lzu.edu.cn/:80/handle/262010/583759
2024-03-15T02:26:38Z
2024-03-15T02:26:37Z
题名: An Ultra-Wideband, Wide-Angle and Transparent Microwave Absorber Using Indium Tin Oxide Conductive Films
作者: Bai, Xiaolei; Mei, Zhonglei; Zhang, Jingwei; Xu, Wenbo; Lin, Weijiong; Niu, Tiaoming
摘要: In this letter, a microwave metamaterial absorber (MMA) with visible-light transparency, ultra- wideband, and wide incidence angle properties is proposed. The MMA is composed of two different materials with Indium Tin Oxide (ITO) conductive films and transparent polymethyl methacrylate (PMMA) substrate layers. And 90% absorption band from 2.5 GHz to 21.3 GHz with fractional bandwidth 158% is achieved by full wave simulation. Besides, the proposed MMA has high angular stability. When a transverse electrical (TE) mode with the oblique angles from 0${}^{\circ}$ to 50${}^{\circ}$ is incident, a perfect absorption above 90% has been achieved. And a similar phenomenon arises for the transverse magnetic (TM) mode from 0${}^{\circ}$ to 70${}^{\circ}$. In accordance with the simulation, a sample with a size of 200×200 mm was fabricated. The experimental results agree well with the simulation, which verifies the feasibility of the design. The transmittance of the MMA in the visible wavelength range (400-750 nm) was also measured. The average transmittance can reach 62.05%. Thus, this design is expected to have potential applications in the fields of transparent microwave absorption and multi-spectrum stealth. IEEE
2024-03-15T02:26:37Z
Spin wave dispersion in perpendicularly magnetized synthetic antiferromagnets
Zhang, Tengfei
Li, Chaozhong
Zhao, Qian
Li, Zimu
Wang, Quwen
Yu, Guoqiang
Han, Xiufeng
Chai, Guozhi
Zhang, Senfu
Liu, Qingfang
Wang, Jianbo
Wei, Jinwu
http:///ir.lzu.edu.cn/:80/handle/262010/583741
2024-03-15T02:25:48Z
2024-03-15T02:25:48Z
题名: Spin wave dispersion in perpendicularly magnetized synthetic antiferromagnets
作者: Zhang, Tengfei; Li, Chaozhong; Zhao, Qian; Li, Zimu; Wang, Quwen; Yu, Guoqiang; Han, Xiufeng; Chai, Guozhi; Zhang, Senfu; Liu, Qingfang; Wang, Jianbo; Wei, Jinwu
摘要: The spin wave is a promising candidate medium to be used as an information carrier and for processing. Knowledge of the spin wave dispersion relation is a prerequisite for its application and the design of devices. Here, we report on spin wave dispersion in perpendicularly magnetized synthetic antiferromagnets (p-SAFs), consisting of two CoFeB layers and a thin W spacer layer. The Brillouin light scattering technique is employed to measure the spin wave dispersion relations as a function of the in-plane magnetic field and wave vector. Two resonance modes are observed in the finite range of the magnetic field, in which the configuration of the magnetic moments in two CoFeB layers can be divided into antiferromagnetic and ferromagnetic states. In addition, we observe a T-type region, where the magnetization in one CoFeB layer lies in the direction of the in-plane magnetic field and the other stays in the out-of-plane direction. The dependences of the frequency on the wave vector demonstrate the spin wave propagation in this case is reciprocal. We also theoretically derive the spin wave dispersion relation for p-SAFs based on the Landau-Lifshitz equation, which agree well with the experimental results. © 2024 American Physical Society.
2024-03-15T02:25:48Z
π Phase Interlayer Shift and Stacking Fault in the Kagome Superconductor CsV3Sb5
Jin, Feng
Ren, Wei
Tan, Mingshu
Xie, Mingtai
Lu, Bingru
Zhang, Zheng
Ji, Jianting
Zhang, Qingming
http:///ir.lzu.edu.cn/:80/handle/262010/583710
2024-03-15T02:24:46Z
2024-03-15T02:24:45Z
题名: π Phase Interlayer Shift and Stacking Fault in the Kagome Superconductor CsV3Sb5
作者: Jin, Feng; Ren, Wei; Tan, Mingshu; Xie, Mingtai; Lu, Bingru; Zhang, Zheng; Ji, Jianting; Zhang, Qingming
摘要: The stacking degree of freedom is a crucial factor in tuning material properties and has been extensively investigated in layered materials. The kagome superconductor CsV3Sb5 was recently discovered to exhibit a three-dimensional CDW phase below TCDW∼94 K. Despite the thorough investigation of in-plane modulation, the out-of-plane modulation has remained ambiguous. Here, our polarization- and temperature-dependent Raman measurements reveal the breaking of C6 rotational symmetry and the presence of three distinct domains oriented at approximately 120° to each other. The observations demonstrate that the CDW phase can be naturally explained as a 2c staggered order phase with adjacent layers exhibiting a relative π phase shift. Further, we discover a first-order structural phase transition at approximately 65 K and suggest that it is a stacking order-disorder phase transition due to stacking fault, supported by the thermal hysteresis behavior of a Cs-related phonon mode. Our findings highlight the significance of the stacking degree of freedom in CsV3Sb5 and offer structural insights to comprehend the entanglement between superconductivity and CDW. © 2024 American Physical Society.
2024-03-15T02:24:45Z
Intercalation chemistry engineering strategy enabled high mass loading and ultrastable electrodes for High-Performance aqueous electrochemical energy storage devices
Cui, Xiaosha
Huang, Zeyu
Xin, Jianyu
Deng, Sida
He, Yu
Zhang, Yaxiong
Zhang, Junli
Chen, Wanjun
Xie, Erqing
Fu, Jiecai
http:///ir.lzu.edu.cn/:80/handle/262010/583706
2024-03-15T02:24:41Z
2024-03-15T02:24:40Z
题名: Intercalation chemistry engineering strategy enabled high mass loading and ultrastable electrodes for High-Performance aqueous electrochemical energy storage devices
作者: Cui, Xiaosha; Huang, Zeyu; Xin, Jianyu; Deng, Sida; He, Yu; Zhang, Yaxiong; Zhang, Junli; Chen, Wanjun; Xie, Erqing; Fu, Jiecai
摘要: Aqueous electrochemical energy storage devices (AEESDs) are considered one of the most promising candidates for large-scale energy storage infrastructure due to their high affordability and safety. Developing electrodes with the merits of high energy density and long lifespan remains a challenging issue toward the practical application of AEESDs. Research attempts at electrode materials, nanostructure configuration, and electronic engineering show the limitations due to the inherent contradictions associated with thicker electrodes and ion-accessible kinetics. Herein, we propose an intercalation chemistry engineering strategy to enhance the electrolyte ion (de)intercalation behaviors during the electrochemical charge–discharge. To validate this strategy, the prototypical model of a high-mass-loading MnO2-based electrode is used with controlled intercalation of Na+ and H2O. Theoretical and experimental results reveal that an optimal content of Na+ and H2O on the MnO2-based electrode exhibits superior electrochemical performance. Typically, the resultant electrode exhibits an impressive areal capacitance of 1551 mF/cm2 with a mass loading of 9.7 mg/cm2 (at 1 mA/cm2). Furthermore, the assembled full-cell with obtained MnO2-based electrode delivers a high energy density of 0.12 mWh/cm2 (at 20.02 mW/cm2) and ultra-high cycling stability with a capacitance retention percentage of 89.63 % (345 mF/cm2) even after 100,000 cycles (tested over 72 days). © 2024 Elsevier Inc.
2024-03-15T02:24:40Z
A NiO@Ti based linear photoelectrochemical type ultraviolet photodetector
Pan, Xiaojun
Zhang, Xinmiao
Wang, Gang
Li, Hongye
Li, Jiang
Song, Jianqiao
Wang, Shimin
Jin, Mengjing
Zhou, Jinyuan
Zhou, Lian
http:///ir.lzu.edu.cn/:80/handle/262010/583698
2024-03-15T02:24:25Z
2024-03-15T02:24:24Z
题名: A NiO@Ti based linear photoelectrochemical type ultraviolet photodetector
作者: Pan, Xiaojun; Zhang, Xinmiao; Wang, Gang; Li, Hongye; Li, Jiang; Song, Jianqiao; Wang, Shimin; Jin, Mengjing; Zhou, Jinyuan; Zhou, Lian
摘要: Omnidirectional detection is widely used in optical tracking systems, omni-directional cameras and optical field measurements and so on. However, the planar structures of ultraviolet (UV) photodetectors (PDs) limit their application in omnidirectional detection. In this work, the NiO nanosheets were fabricated on a titanium (Ti) wire substrate by hydrothermal method and then assembled a photoelectrochemical (PEC) type UV photodetector (PD). Under ultraviolet (UV) irradiation of 35 mW cm−2 @ 365 nm, the PD exhibits a stable photocurrent of 1.53 μA cm−2 and repeatable switching cycles. Also, the PD presents fast response and recovery times of 0.074 s and 0.130 s, respectively. Particularly, the PD based on NiO@Ti possesses excellent response for rotation angles in the range from 0° to 360° under UV light irradiation. © 2024 Elsevier B.V.
2024-03-15T02:24:24Z