Spintronic Transport Performances of VSe2 Nanoribbons

2020 ◽  
Vol 15 (2) ◽  
pp. 269-275
Author(s):  
Wei-Chao Zhang ◽  
Wei-Feng Sun
Keyword(s):  
Bias Voltage ◽  
Electronic Transport ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
Transmission Spectra ◽  
First Principles Calculations ◽  
Spintronic Devices ◽  
Crystal Anisotropy ◽  
Filtering Effect

The spin-resolved electronic transport behaviors of VSe2 nanoribbons are theoretically investigated to explore their applications in spintronic devices, employing by the first-principles calculations combined with nonequilibrium Green's function scheme. The band structure, current varying curves with bias voltage between nanoribbon terminal electrodes and electronic transmission spectra of two representative VSe2 nanoribbons along zigzag and armchair crystallographic orientations are calculated respectively. The evident negative differential resistance under the bias voltage of ∼0.6 V for the armchair orientation has been found, implying the significant crystal anisotropy of VSe2 monolayer. Meanwhile, both the VSe2 nanoribbon devices along zigzag and armchair directions represent favorable spin filtering effect, suggesting they are prospective candidates as a multifunction material in spintronic and digital applications.

Influence of spatial distribution of molecule on the switching behavior: A first-principles study

2018 ◽  
Vol 17 (06) ◽  
pp. 1850038 ◽  
Author(s):  
Jingjuan Yang ◽  
Xiaoxiao Han ◽  
Peipei Yuan ◽  
Baoan Bian ◽  
Bin Liao
Keyword(s):  
Spatial Distribution ◽  
Electronic Transport ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
Switching Behavior ◽  
Spatial Distributions ◽  
Transmission Spectra ◽  
First Principles Calculations ◽  
Negative Differential Resistance Effect

We perform first-principles calculations to investigate the electronic transport properties of chalcone and flavanone molecules sandwiched between graphene electrodes. These two molecules can be reversibly converted between open and closed states induced by pH, and the significant switching behaviors are observed. The currents and switching ratios are influenced by rotating molecules around the [Formula: see text] axis, which are discussed by the transmission eigenstates, electrostatic potential distributions and transmission spectra. The observed negative differential resistance effect is explained in chalcone configuration. The results suggest that spatial distributions of molecules will influence the performance of devices, indicating a potential application in future molecular circuits.

scholarly journals Edge hydrogenation-induced spin-filtering and negative differential resistance effects in zigzag silicene nanoribbons with line defects

RSC Advances ◽  
2017 ◽  
Vol 7 (41) ◽  
pp. 25244-25252 ◽  
Author(s):  
Xiaoteng Li ◽  
Dongqing Zou ◽  
Bin Cui ◽  
Changfeng Fang ◽  
Jingfen Zhao ◽  
...  
Keyword(s):  
First Principles ◽  
Negative Differential Resistance ◽  
Spin Transport ◽  
Differential Resistance ◽  
First Principles Calculations ◽  
Line Defects ◽  
Silicene Nanoribbons ◽  
Spin Filtering

We investigate the effects of line defects (558-defect and 57-defect) and edge hydrogenation (mono-hydrogenation and di-hydrogenation) on magnetism and spin transport of zigzag silicene nanoribbons (ZSiNRs) by first-principles calculations.

THE INFLUENCE OF THE COUPLING STRENGTH ON THE ELECTRON TRANSPORT THROUGH THE BENZENE-1,4-DITHIOLATE MOLECULAR JUNCTION

2013 ◽  
Vol 27 (16) ◽  
pp. 1350121 ◽  
Author(s):  
YUNJIN YU ◽  
YAOYU LI ◽  
LANGHUI WAN ◽  
BIN WANG ◽  
YADONG WEI
Keyword(s):  
Electron Transport ◽  
Electronic Transport ◽  
Coupling Strength ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Resonant State ◽  
Differential Resistance ◽  
Stable Configuration ◽  
Molecular Junction ◽  
Aluminum Metal

The electronic transport properties of one benzene-1,4-dithiolate molecule coupled by two aluminum metal leads were investigated by using first-principles method. The influence of the coupling distance between the molecule and the electrodes on I–V curve was studied thoroughly. Our calculations showed that when the system is in the most stable configuration, where the system total energy is the lowest, and the electron transport is in off-resonant state. Starting from the most stable configuration, when we gradually increase the distance between the molecule and electrodes and so decreasing the coupling strength of the molecule and electrodes, the conductance, as well as the I–V curve, does not decrease immediately but increase quickly at first. Only when we separate the molecule and electrodes far enough, the current begins to drop quickly. The total scattering charge density was presented in order to understand this phenomenon. A one-level quantum dot model is used to explain it. Finally, negative differential resistance was observed and analyzed.

An Ab Initio Study on Negative Differential Resistance in Pyrrole Trimer Molecular Device

2010 ◽  
Vol 152-153 ◽  
pp. 931-934
Author(s):  
Cai Juan Xia ◽  
Han Chen Liu ◽  
Qiu Ping Wang
Keyword(s):  
Electronic Transport ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Density Functional ◽  
Differential Resistance ◽  
Resonance Peak ◽  
Molecular Device ◽  
Transmission Resonance ◽  
Functional Theory ◽  
Theoretical Results

The electronic transport properties of pyrrole trimer sandwiched between two electrodes are investigated by using nonequilibrium Green’s function formalism combined first-principles density functional theory. Theoretical results show that the system manifests negative differential resistance (NDR) behavior. A detailed analysis of the origin of negative differential resistance has been given by observing the shift in transmission resonance peak across the bias window with varying bias voltage.

Length-dependent rectification and negative differential resistance in heterometallic n-alkanedithiol junctions

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 13917-13922 ◽  
Author(s):  
Jian Shao ◽  
X. Y. Zhang ◽  
Yue Zheng ◽  
Biao Wang ◽  
Yun Chen
Keyword(s):  
Transport Properties ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
First Principles Calculations

The transport properties of heterometallic n-alkanedithiol junctions were investigated via first-principles calculations.

LOCALIZATION OF THE ENERGY STATES OF LEAD INDUCING THE EFFECT OF RECTIFICATION AND NEGATIVE DIFFERENTIAL RESISTANCE PREDICTED BY FIRST-PRINCIPLES STUDY

2013 ◽  
Vol 27 (17) ◽  
pp. 1350081 ◽  
Author(s):  
Y. MIN ◽  
J. H. FANG ◽  
C. G. ZHONG ◽  
Z. C. DONG ◽  
C. P. CHEN ◽  
...  
Keyword(s):  
Molecular Electronics ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Reverse Bias ◽  
Forward Bias ◽  
Differential Resistance ◽  
First Principles Calculations ◽  
Rectification Effect ◽  
Potential Applications ◽  
Energy States

The first-principles calculations of the transport characteristics of 4-(5-(2-(5-(4-mercaptophenyl)thiophene-2-yl)ethyl)pyridin-2-yl)benzenethiol sandwiched between two gold leads are performed. The effect of rectification and negative differential resistance (NDR) are obtained, which promise the potential applications in the field of molecular electronics. The rectification effect is 4.49. The peak/valley ratio of the NDR effect is as large as 4.51 for the forward bias and 12.09 for the reverse bias. The strong coupling between gold lead and molecule through thiolate results in the localization of the energy states of gold lead, which may induce the effect of rectification and NDR.

scholarly journals Negative differential resistance and magnetoresistance in zigzag borophene nanoribbons

2018 ◽  
Vol 32 (04) ◽  
pp. 1850033 ◽  
Author(s):  
Jiayi Liu ◽  
Jiaxin Wu ◽  
Changpeng Chen ◽  
Lu Han ◽  
Ziqing Zhu ◽  
...  
Keyword(s):  
Transport Properties ◽  
Negative Differential Resistance ◽  
Differential Resistance ◽  
First Principles Calculations ◽  
Maximum Value ◽  
Current Voltage ◽  
Magnetic Transport ◽  
Filtering Effect ◽  
Bias Range ◽  
Opposite Magnetization

Since borophene has been grown experimentally, its extraordinary characteristics have attracted more and more attentions. In this paper, we construct pristine zigzag-edged borophene nanoribbons (ZBNRs) of different widths to study the transport properties, using the first-principles calculations. The differences of the quantum transport properties are discussed, where even-N ZBNRs and odd-N ZBNRs have different current–voltage relationships. Especially, the negative differential resistance (NDR) can be observed within certain bias range in 5-ZBNR and 7-ZBNR, while 6-ZBNR behaves like a metal whose current rises with the increase of the voltage. Moreover, borophene nanoribbon shows interesting magnetic transport properties. The spin-filtering effect can be revealed when the two electrodes have opposite magnetization directions. Besides, the magnetoresistance effect appears to exist in even-N ZBNRs and the maximum value can reach 70%. The mechanisms of these phenomena are proposed in detail.

scholarly journals Strong spin-filtering and spin-valve effects in a molecular V–C60–V contact

2012 ◽  
Vol 3 ◽  
pp. 589-596 ◽  
Author(s):  
Mohammad Koleini ◽  
Mads Brandbyge
Keyword(s):  
Electronic Properties ◽  
Electronic Transport ◽  
First Principles ◽  
Spin Valve ◽  
Spin Coupling ◽  
First Principles Calculations ◽  
Filtering Effect ◽  
Majority Spin ◽  
Strong Spin ◽  
Spin Filtering

Motivated by the recent achievements in the manipulation of C60 molecules in STM experiments, we study theoretically the structure and electronic properties of a C60 molecule in an STM tunneljunction with a magnetic tip and magnetic adatom on a Cu(111) surface using first-principles calculations. For the case of a vanadium tip/adatom, we demonstrate how spin coupling between the magnetic V atoms, mediated by the C60, can be observed in the electronic transport, which display a strong spin-filtering effect, allowing mainly majority-spin electrons to pass (>95%). Moreover, we find a significant change in the conductance between parallel and anti-parallel spin polarizations in the junction (86%) which suggests that STM experiments should be able to characterize the magnetism and spin coupling for these systems.

Rectification in zigzag graphene/BN nanoribbon heterojunction

2018 ◽  
Vol 32 (32) ◽  
pp. 1850395
Author(s):  
Baoan Bian ◽  
Jingjuan Yang ◽  
Xiaoxiao Han ◽  
Peipei Yuan ◽  
Yuqiang Ding
Keyword(s):  
Density Functional Theory ◽  
First Principles ◽  
Negative Differential Resistance ◽  
Density Functional ◽  
Differential Resistance ◽  
Transmission Spectra ◽  
Density Of State ◽  
Functional Theory ◽  
Negative Differential Resistance Effect ◽  
Non Equilibrium Green’S Function

We investigate the effect of changed BN nanoribbon on the rectifying behavior in zigzag graphene/BN nanoribbon heterojunction using first principles based on non-equilibrium Green’s function and density functional theory. The increased BN length in the scattering region reduces the rectifying performance of the device, and the maximum rectifying ratio is [Formula: see text] in the heterojunction. We discuss the different rectifying characteristics for the designed models by calculating the transmission spectra at different biases. The rectifying phenomenon is further investigated by the projected density of state of device. Furthermore, we explain the observed negative differential resistance effect by the transmission spectra and transmission eigenstates. The results suggest that the zigzag graphene/BN nanoribbon heterojunction leads to the asymmetric current, causing the rectifying phenomenon, and the BN length in the scattering region can modulate the rectifying performance of zigzag graphene/BN nanoribbon heterojunction.

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