oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 68 )

2018 ( 792 )

2017 ( 776 )

2016 ( 727 )

Custom range...

Search Results: 1 - 10 of 56061 matches for " Dong Zheng-Chao "
All listed articles are free for downloading (OA Articles)
Page 1 /56061
Display every page Item
INTERFACE REFLECTION EFFECTS IN A MAGNETIC MULTILAYERED METALLIC SYSTEM
磁多层金属系统的界面反射效应

DONG ZHENG-CHAO,
董正超

物理学报 , 1999,
Abstract: 考虑到磁多层金属系统中的粗糙界面散射效应,运用量子统计的格林函数方法和久保理论,计算磁多层金属系统的单粒子传播格林函数和电导率.所得结果依赖于电子在界面处的反射波幅和空间尺寸,并能展示巨磁电阻的主要实验特征.
EFFECTS OF INTERFACE ROUGHNESS AND SPIN-FLIP ON TUNNELSPECTRUM IN FERROMAGNET-d-WAVE SUPERCONDUCTOR JUNCTIONS
铁磁-d波超导结中的粗糙界面散射和自旋反转效应对隧道谱的影响

DONG ZHENG-CHAO,
董正超

物理学报 , 2001,
Abstract: 考虑到铁磁层中的自旋极化效应、以及界面的粗糙散射和自旋反转效应,利用推广了的Blonder Tinkham Klapwijk理论模型,计算铁磁d波超导结中的自旋极化隧道谱.研究表明1)自旋反转效应能使零偏压电导峰变得尖锐;2)粗糙的界面散射除了能压低零偏压电导峰的高度,还能使零偏压凹陷处感应出一中心峰.结果能定性地解释最近的两篇关于La2/3Ba1/3 MnO3/DyBa2Cu3O7
A BROKEN TIME REVERSAL SYMMETRY PAIRING AND QUASIPARTICLE LIFETIME EFFECT IN THE d-WAVE SUPERCONDUCTOR NIS JUNCTION
d波超导体NIS结中的时间反演对称态的破缺与准粒子寿命效应

DONG ZHENG-CHAO,
董正超

物理学报 , 2000,
Abstract: 考虑到d波超导表面时间反演对称态的破缺与准粒子的有限寿命效应,在BlonderTinkhamKlapwijk(BTK)理论框架下,通过求解BogoliubovdeGennes(BdG)方程,计算正常金属d波超导隧道结中的准粒子输运系数与隧道谱.研究表明:1)d波超导表面时间反演对称态的破缺会导致零偏压电导峰位移,位移的程度取决于分解d波超导表面时间反演对称态中s波分量的强度;2)准粒子的寿命效应与粗糙界面散射效应都能压低零偏压电导峰,其中粗糙界面散射还会阻碍零偏压电导峰的位移.这些结果能较好地解释Tc氧化
SURFACE AND INTERFACES SCATTERING EFFECT ON QUANTUM TRANSPORT IN MULTILAYERED CYLINDRICAL WIRE
多层金属圆柱线中量子输运的表面和界面散射效应

DONG ZHENG-CHAO,
董正超

物理学报 , 1999,
Abstract: Taking into account the quantum size effects and considering three types of scattering from bulk impurities,rough surface and rough interfaces,we use the quantum-statistical Green's function approach to calculate the conductivity in multilayered cylindrical wire.It is found that in the lowest-order approximation of impurities,surface and interfaces scattering,the total conductivity is given by a sum of conductivities of all the subbands; and the scattering rates for the individual subbands due to the impurities,surface and interfaces are additive.
MAGNETIC SCATTERING EFFECT ON QUANTUM TRANSPORT IN THE NORMAL METAL FERROMAGNET INSULATOR-d WAVE SUPERCONDUCTOR JUNCTIONS
正常金属-铁磁绝缘层-d波超导结中的磁散射对量子输运的影响

DONG ZHENG-CHAO,
董正超

物理学报 , 1999,
Abstract: Taking into account the rough interface scattering and magnetic scattering effects of the ferromagnet layer in the normal metal-ferromagnet insulator-d wave superconductor junctions,using Bogoliubov-de Gennes equations and Blonder-Tinkham-Klapwijk model,we have calculated the differential conductance.It is found that:1)both rough interface scattering and magnetic scattering can suppress the zero-bias conductance peaks(ZBCP),in which the magnetic scattering can lead to a splitting of the ZBCP but the rough interface can resist the splitting,and the ZBCP will evolve some dips due to two higher potentials of the scattering;2)the subgap resonances in the differential conductance are predicted under the condition of a ferromagnet layer located at a distance several times larger than the coherence length from the superconductor interface.
Effects of quantum interference on differential conductance and shot noise in ferromagnet-insulator-ferromagnet-d-wave superconductor junctions
铁磁-绝缘层-铁磁-d波超导结中的量子干涉效应对微分电导与散粒噪声的影响

Dong Zheng-Chao,
董正超

物理学报 , 2002,
Abstract: The differential conductance, average current and shot noise power in ferromagnet\|insulator\|ferromagnet\|d\|wave superconductor junctions are studied by solving the Bogoliubov\|de Gennes equations within an extended Blonder\|Tinkham\|Klapwijk scattering formulation. It is shown that both the differential conductance and the shot noise power to average current ratios oscillate with the length of the intermediate ferromagnetic layer, the oscillation amplitude increases with the increase of insulator's barrier height, and decreases with the increase of ferromagnetic exchange splitting in the ferromagnet.
IMPURITIES AND INTERFACE SCATTERING EFFECT ON THE DIFFERENTIAL CONDUCTANCE NORMAL METAL-d-WAVE SUPERCONDUCTOR JUNCTIONS
正常金属-d波超导隧道结中杂质和界面散射对微分电导的影响

DONG ZHENG-CHAO,
董正超

物理学报 , 1999,
Abstract: Taking into account the impurities and rough interface scattering, using Bogoliubov-de Gennes (BdG) equations and Bolonedr-Tinkham-Klapwijk (BTK) model, we calculate the differential conductance of normal metal-d-wave superconductor. It is found that the tunneling spectum depends strongly on both the incident angle electrons and the crystalline axis orientation of superconductor, and exhibits the zero-bias conductance peak under suitable arrangements. Morevover, the zero-bias conductance dip can be splitted into two small conductance dips by the impurities scattering, the tunnel conductance peak at the energy gap and the zero-bias conductance are suppressed and smoothed by the interface roughnes. Our result can explain many experimental measurements on the tunneling spectum of high-Tc superconductors.
QUANTUM ANALYTICAL THEORY FOR GIANT MAGNETORESISTANCE IN A MAGNETIC SANDWICH STRUCTURE
磁三明治结构巨磁阻的量子解析理论

DONG ZHENG-CHAO,
董正超

物理学报 , 1997,
Abstract: Using the quantum statistical Green's function approach,we have studied the giant magneto resistance effect in magnetic sandwich structure,and developed a unified conductivity fomula.The relation between the classical and quantum theories and the transition from classical to quantum result are also discussed.
Spin-polarized transport in ferromagnetic semiconductor/ferromagnetic d-wave superconductor tunnel junction
磁性半导体/磁性d波超导结中的自旋极化输运

Dong Zheng-Chao,
董正超

物理学报 , 2008,
Abstract: 通过求解磁性d波超导中的能隙与磁交换能的自恰方程,利用推广的Blonder-Tinkham-Klapwijk理论研究磁性半导体/磁性d波超导结中自旋极化准粒子输运系数与微分电导.计算表明:1)磁性d波超导结中的磁交换能h0可导致零偏压电导峰与能隙电导峰劈裂,劈裂的宽度为2h0;2)磁性半导体中的磁交换能hFS可使零偏压电导峰劈裂的峰值变低.而由能隙电导峰劈裂的两个子峰,当两种磁性材料的磁化方向平行时,右边的峰值随着hFS的变大而变高,左边的峰值变低,当两磁性材料的磁化方向反平行时,随hFS变大右边的峰值变低,左边的峰值变高.
Zeeman effects on the coherent tunnelling conductance in normal-metal/superconductor/normal-metal double tunnel junctions
塞曼效应对正常金属/超导/正常金属双隧道结中的相干隧穿电导的影响

Dong Zheng-Chao,
董正超

中国物理 B , 2005,
Abstract: The coherent quantum transport is investigated in normal-metal/superconductor/normal-metal(N/S/N) double tunnel junctions under a Zeeman magnetic field on the S.Taking simultaneously into account the electron-injected current from one Nelectrode and the hole-injected current from the other Nelectrode,we derive a general formulafor the differential conductance in the N/S/N system.It is shown that the conductance spectrum exhibits oscillatory behaviour with the bias voltage, and the oscillation amplitude is reduced wiht increasing temperature and Zeeman magneti field, the Zeeman energy can lead to the Zeeman splitting of conductance peaks.In the tunnel limit, a series of bound states of quasiparticles will form in the S.
Page 1 /56061
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.