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Observation of multiple surface states in naturally cleavable chiral crystal PdSbSe

Physical Review Materials 2025年第3期9卷 L031201-L031201页

作者： Zhicheng Jiang Zhengtai Liu Chenqiang Hua Xiangqi Liu Yichen Yang Jianyang Ding Jiayu Liu Jishan Liu Mao Ye Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology University of Science and Technology of China Hefei 230026 China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences Shanghai 200050 China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou 310027 China State Key Lab of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Beihang Hangzhou Innovation Institute Yuhang Xixi Octagon City Yuhang District Hangzhou 310023 China School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

Chiral multifold fermions in solids exhibit unique band structures and topological properties, making them ideal for exploring fundamental physical phenomena related to nontrivial topology, chirality, and symmetry breaking. However, the challenge of obtaining clean, flat surfaces through cleavage has hindered the investigation of their unique electronic states. In this study, we utilize high-resolution angle-resolved photoemission spectroscopy and density functional theory calculations to investigate the low-energy electronic structure of the cleavable single-crystal PdSbSe. Our combined experimental and theoretical analysis reveals the presence of multifold-degenerate fermions within this chiral crystal. We also observe multiple chiral Fermi arc surface states and spin-splitting behavior in the associated bulk bands. These findings provide unique insights into chiral, multifold fermionic states in easily cleavable crystals and offer a robust platform for further research into their unique electronic properties and potential applications in novel electronic devices.

关键词： Photoelectron spectroscopy

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Study and analysis of coefficient mismatch in a MASH21 sigma—delta modulator

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Journal of Semiconductors 2010年第1期31卷 79-82页

作者：葛彬杰王新安张兴冯晓星汪清勤 Key Laboratory of Integrated Microsystem Science & Engineering Applications Shenzhen Graduate School of Peking University

The quantization noise leakage of the first stage in a MASH21 sigma-delta modulator is analyzed. The results show that the finite DC gain of the opamp is the main reason for noise leakage, and finite GBW and SR only generate harmonic distortion. The relationship between DC gain and leakage is modeled and conclusions on design criteria are reached. As an example, a MASH21 modulator for a digital audio application is realized. This modulator, fabricated in an 0.18 μm mixed signal process, achieves an SNDR of 91 dB with 1.8 V supply, which verifies the analysis and design criteria.

关键词： mismatch leakage modeling sigma-delta modeling DC gain

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Sigma-delta modulator modeling analysis and design

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Journal of Semiconductors 2010年第9期31卷 79-83页

作者：葛彬杰王新安张兴冯晓星汪清勤 Key Laboratory of Integrated Microsystem Science & Engineering Applications Shenzhen Graduate School of Peking University

This paper introduces a new method for SC sigma-delta modulator *** studies the integrator＇s different equivalent circuits in the integrating and sampling *** model uses the OP-AMP input pair＇s tail current（I_0） and overdrive voltage（v_（on）） as *** modulator＇s static and dynamic errors are analyzed.A group of optimized I0 and von for maximum SNR and power x area ratio can be obtained through this *** examples, a MASH21 modulator for digital audio and a second order modulator for RFID baseband are implemented and tested, and they can achieve 91 dB and 72 dB respectively,which verifies the modeling and design criteria.

关键词： sigma-delta modeling transient behavior optimization

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Dynamic Context Management for Coarse-grained Reconfigurable Array DSP Architecture

Dynamic Context Management for Coarse-grained Reconfigurable...

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IEEE 8th International Conference on ASIC

作者： Liu, Yanliang Dai, Peng Wang, Xin'an Zhang, Xing Wei, Lai Zhou, Yan Sun, Yachun Peking University Shenzhen Graduate School China Key Lab. of Integrated Microsystem Science and Engineering Applications China

ISBN: (纸本)9781424438686

This paper proposes a novel technique of dynamic context management scheme for coarse-grained reconfigurable array DSP architecture, which effectively reduces the power consumption and speedup reconfigurable process. The technique permits background loading of configuration data without interrupting the regular execution, overlapping computation with reconfiguration. And stored configurations can be switched dramatically reducing reconfiguration overhead if the next configuration is present in one of the alternate contexts. The proposed technique has been verified in ReMAP (Reconfigurable Multi-media Array Processors) with the Discrete Cosine Transform (DCT) of H.264 and its performance exceed other DSP and multimedia extension architectures by 1.2x to 6.2x. ReMAP was fabricated with SMIC's 0.18um CMOS process mainly for multi-media applications(1).

关键词： Coarse-grained Reconfigurable Array DSP Architecture Context switch Context reuse Runtime reconfiguration (RTR) Partially Reconfiguration

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Semantic classification based clothing image retrieval

Semantic classification based clothing image retrieval

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2012 3rd IEEE/IET International Conference on Audio, Language and Image Processing, ICALIP 2012

作者： Lu, Zhiyuan Shen, Ling Yuan, Yule Zhao, Yong Key Lab. of Integrated Microsystem Science and Engineering Applications Peking University Shenzhen Graduate School China

ISBN: (纸本)9781467301718

Performance of content-based image retrieval technology used in clothing image retrieval cannot meet user's requirement due to the 'semantic gap' between low-level visual features and the richness of human semantics and it's time consuming to searching images in a growing number on the internet. In order to reduce the 'semantic gap' and improve the searching speed, this paper introduces a novel clothing image retrieval method based on color semantic classification. In this method, database images are classified into different categories with color semantic features and indexed by their visual features. In the retrieval process, images with the same semantic category are selected as candidates and further ranked by their visual features. The sematic information can also be used integrated with text information labeled on the internet. Experimental results demonstrate our proposed method provides promising retrieval performance in less time than previous methods. © 2012 IEEE.

关键词： Semantics

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Design and implementation of a novel programmable power monitor chip

Design and implementation of a novel programmable power moni...

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2nd Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics, PrimeAsia 2010

作者： Ge, Binjie Wang, Xin'an Zhang, Xing Feng, Xiaoxing Wang, Qingqin Key Lab. of Integrated Microsystem Science and Engineering Applications Peking University Shenzhen Graduate School Shenzhen China

ISBN: (纸本)9781424467372

This paper proposes a novel programmable power monitor chip. With only three program pins and without any off-chip devices, the chip has 36-program states by taking different connections for the 3-program pins. The chip can monitor the voltage from 1.5v to 5.0v with 0.1v step. Special SH circuit and current limited digital blocks are employed to achieve ultra low quiescent power. The implementation is based on 2M1P 0.5um mixed signal process, the die area is 0.24mm2, and the quiescent current is only 3uA.

关键词： Signal processing

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ML estimation of non-virtual sub-carriers OFDM carrier frequency offset

ML estimation of non-virtual sub-carriers OFDM carrier frequ...

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Mobile Computing and Wireless Communications International Conference, MCWC 2006

作者： Bo, Hong Xin'an, Wang Gaofa, Xiao Key Lab. of Integrated Microsystem Science and Engineering Applications PKU Shenzhen Graduate School Shenzhen 518055 China

ISBN: (纸本)9957486004

In OFDM system, because of sensitivity to carrier frequency offset, frequency offset must be compensated before DFT in the receiver. In this paper, we present a maximum likelihood estimation for carrier frequency offset, based on OFDM symbol has no virtual sub-carriers. The estimation are compose of two parts, blind estimation makes use of cyclic prefix for every symbol and data-aid estimation makes use of two consequent OFDM symbols which are similar or relative to each other. Data-aid estimation performs well and simulation result converges upon Cramer-Rao lower bound. Blind estimation performs inferior, but it can be used in tracking mode.

关键词： Orthogonal frequency division multiplexing

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Operator design methodology and implementation for H.264 entropy encoder

Operator design methodology and implementation for H.264 ent...

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International Conference on Information engineering and Computer science

作者： Hu, Ziyi Chen, Kuilin Wang, Xin'an Key Lab. of Integrated Microsystem Science and Engineering Applications Peking University Shenzhen Graduate School Shenzhen 518055 China

ISBN: (纸本)9781424479412

Currently the ASIC applications such as multimedia processing require shorter time-to-market and higher performance. Furthermore, with the IC manufacturing technology developing continually, from transistor level to logic gate level, the size of standard cells in digital circuits is increasing correspondingly. New methodology should be proposed to meet the need for shorter time-to-market IC industry, and the requirement of advanced IC manufacturing technology. This paper proposed the concept and principle of operator design methodology, then focused on the entropy coding application by the reconfigurable operator and finally gave the synthesis data. The results show that compared with the hardware design at the same cost of resources, this methodology can obtain hardware of suitable performance with regular structure. What is more, it can improve the design speed efficiently. ©2010 IEEE.

关键词： Entropy

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Theory and verification of operator design methodology

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science China(Information sciences) 2012年第2期55卷 480-490页

作者： HU ZiYi1,ZHAO Yong1,WANG XinAn1,HUANG Ru2,WANG Teng1 & ZHANG Xing2 1key lab of integrated microsystem science and engineering applications,Peking University Shenzhen Graduate School,Shenzhen 518055,China 2Institute of Microelectronics,Peking University,Beijing 100871,China 1. Key Lab of Integrated Microsystem Science and Engineering Applications Peking University Shenzhen Graduate School Shenzhen 518055 China2. Institute of Microelectronics Peking University Beijing 100871 China

Non-recurring-engineering(NRE)and time-to-market play an increasingly important role in the field of IC ***,with the continuous development of IC manufacturing technology,it is necessary to propose a novel design methodology to shorten design cycle and enhance design *** this paper,operator design methodology(ODM)is presented and an H.264 encoder is implemented as a *** to the flow of ODM,the register transfer level(RTL)design of H.264 encoder has been accomplished with 15 man-months,which is lower than the average 19 man-months in the field of traditional application specific integrated circuit(ASIC)***,with the advantage of operator design library,the design has a comparable performance with other ASIC *** obtained design can support a real-time video encoding of 720p at 60 frames per second or 1080p at 30 frames per second,working at 167 MHz with SMIC 0.13 μm CMOS *** results provide good evidence for the practicability and efficiency of ODM.

关键词： operator design methodology H.264 encoder integrated circuit hardware

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Implementation of high-speed verification platform based on emulator for ReDSP and ReMAP

Implementation of high-speed verification platform based on ...

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2009 8th IEEE International Conference on ASIC, ASICON 2009

作者： Huang, Wei Wang, Xinan Dai, Peng Guo, Zheng Peking University Shenzhen Graduate School China Key Lab. of Integrated Microsystem Science and Engineering Applications China Mentor Graphics Corporation China

ISBN: (纸本)9781424438686

Verification of processors with high performance is becoming more and more time-consuming and even gradually turning into the bottleneck of the processor design. The Verification of Reconfiguralbe Multimedia Array Processor(ReMAP) we designed for multimedia processing and its internal component Reconfigurable DSP(ReDSP) is also no exception. A high-speed verification platform based on emulator is proposed for ReDSP and ReMAP. We demonstrate the hardware architecture of the platform and different verification modes it supports. A software verification model is proposed, and the evaluation results show a great acceleration rate compared to software simulation1. ©2009 IEEE.

关键词： Verification

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