Chirality-Induced Giant Unidirectional Magnetoresistance in Twisted Bilayer Graphene

Liu, Yizhou; Holder, Tobias; Yan, Binghai

doi:10.1016/j.xinn.2021.100085

Cited by 32 publications

(25 citation statements)

References 65 publications

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“…To the best of our knowledge, the chirality of the twist has been considered only in a few works as far as the optical properties are concerned [38][39][40][41][42]. Very recently, it turns out that the chirality can induce an asymmetry in the transport phenomena of the tBLG [43].…”

Section: Introductionmentioning

confidence: 99%

Chirality-induced spin texture switching in twisted bilayer graphene

Yananose,

Cantele,

Lucignano

et al. 2021

Preprint

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The interlayer van der Waals interaction in twisted bilayer graphene (tBLG) induces both inplane and out-of-plane atomic displacements exhibiting complex patterns that depend on the twist angle. In particular, for small twist angles, within each graphene layer, the relaxations give rise to a vortex displacement pattern which is known to affect the dispersion of the flat band. Here, we focus on yet another structural property, the chirality of the twisted bilayer. We perform first-principles calculations based on density functional theory, starting from the ground state optimized structures of tBLG at different twist angles. We study the interplay between twist chirality and the atomic relaxation patterns. Furthermore, we investigated the spin textures around the K points of the Brillouin zone, showing that alternating vortex-like patterns are correlated to the chirality of tBLG. Interestingly, the sense of rotation of each vortex is inverted by changing the chirality in tBLG while the different twist angles also modify the spin textures. We discuss the origin of the spin textures by calculating the layer weights and using plot regression models.

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Section: Introductionmentioning

confidence: 99%

Chirality-induced spin texture switching in twisted bilayer graphene

Yananose,

Cantele,

Lucignano

et al. 2021

Preprint

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“…We conceive a two-terminal vertical device where two electrodes sandwich twisted bilayers or multiple layers, as illustrated in Figure 4. Very recently, it was proposed that flat bands significantly enhance the MCD effect in twisted materials 46 . The MCD comes from the coexistence of magnetization (or magnetic field) and chirality.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, van der Waals materials provide a versatile platform to investigate the relation of CISS with SOC, magnetism, and the chiral layer insulation. It would be more exciting to examine the influence of flat bands 39,46 , correlation effects, and even superconductivity in CISS 51 .…”

Section: Discussionmentioning

confidence: 99%

Magnetochiral Polarization and High Order Transport in DNA type Chiral Materials

Xiao¹,

Yan²

2022

Preprint

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The chirality-spin interaction is a fascinating topic for both physicists and chemists. For example, chiral molecules like DNA generate giant spin polarization in nanodevices characterized by large magnetoresistance. This phenomenon called chiral induced spin selectivity (CISS) in literature, paves pathways for unconventional spintronic devices and enantiomer separation. However, its physical mechanism is elusive and debated. In this work, we find that the CISS magnetoresistance is a high-order effect and originates from the current-driven charge accumulation at metal-chiral molecule interfaces. Reversing lead magnetization modulates the charge polarization and consequently changes the tunneling barrier across the molecule. The magnetoresistance increases with the barrier width and bias and can theoretically approach 100%. This mechanism can be validated by examining the insulation of chiral molecules, spin-orbit coupling in leads, or frequency-dependence of surface potential. Further, we propose that emerging twisted van der Waals quantum materials will be a versatile platform for CISS and similar spin selective phenomena. IntroductionChirality is a fundamental concept in chemistry, physics, and biology 1 . Recently, chirality was reported to generate intriguing spin polarization, called chiral induced spin selectivity (CISS) 2 .

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“…Nanotechnology has emerged rapidly during the past years in a broad range of product domains. It provides opportunities to manipulate or develop materials at nanoscale dimensions for a wide variety of applications ( Liong et al, 2008 ; Chhowalla et al, 2013 ; Wu H. et al, 2020 ; Liu et al, 2021 ; Xuan et al, 2021 ), where conventional techniques may reach their limits. Nanomaterials (NMs) are inevitably being released into the environment during the processes of production, transport, use, disposal and recycling, and subsequently into human bodies.…”

Section: Introductionmentioning

confidence: 99%

Radiolabeling of Nanomaterials: Advantages and Challenges

et al. 2021

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Quantifying the distribution of nanomaterials in complex samples is of great significance to the toxicological research of nanomaterials as well as their clinical applications. Radiotracer technology is a powerful tool for biological and environmental tracing of nanomaterials because it has the advantages of high sensitivity and high reliability, and can be matched with some spatially resolved technologies for non-invasive, real-time detection. However, the radiolabeling operation of nanomaterials is relatively complicated, and fundamental studies on how to optimize the experimental procedures for the best radiolabeling of nanomaterials are still needed. This minireview looks back into the methods of radiolabeling of nanomaterials in previous work, and highlights the superiority of the “last-step” labeling strategy. At the same time, the problems existing in the stability test of radiolabeling and the suggestions for further improvement are also addressed.

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Chirality-Induced Giant Unidirectional Magnetoresistance in Twisted Bilayer Graphene

Cited by 32 publications

References 65 publications

Chirality-induced spin texture switching in twisted bilayer graphene

Chirality-induced spin texture switching in twisted bilayer graphene

Magnetochiral Polarization and High Order Transport in DNA type Chiral Materials

Radiolabeling of Nanomaterials: Advantages and Challenges

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