scholarly journals Evidence of two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Minyong Han ◽  
Hisashi Inoue ◽  
Shiang Fang ◽  
Caolan John ◽  
Linda Ye ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Finite Energy ◽  
Flat Band ◽  
Tunneling Conductance ◽  
Two Dimensional ◽  
Structure Transition ◽  
Spintronic Devices ◽  
Lattice Geometry ◽  
Planar Tunneling ◽  
Type Semiconductor

AbstractThe kagome lattice has long been regarded as a theoretical framework that connects lattice geometry to unusual singularities in electronic structure. Transition metal kagome compounds have been recently identified as a promising material platform to investigate the long-sought electronic flat band. Here we report the signature of a two-dimensional flat band at the surface of antiferromagnetic kagome metal FeSn by means of planar tunneling spectroscopy. Employing a Schottky heterointerface of FeSn and an n-type semiconductor Nb-doped SrTiO3, we observe an anomalous enhancement in tunneling conductance within a finite energy range of FeSn. Our first-principles calculations show this is consistent with a spin-polarized flat band localized at the ferromagnetic kagome layer at the Schottky interface. The spectroscopic capability to characterize the electronic structure of a kagome compound at a thin film heterointerface will provide a unique opportunity to probe flat band induced phenomena in an energy-resolved fashion with simultaneous electrical tuning of its properties. Furthermore, the exotic surface state discussed herein is expected to manifest as peculiar spin-orbit torque signals in heterostructure-based spintronic devices.

scholarly journals 2D hybrid CrCl2(N2C4H4)2 with tunable ferromagnetic half-metallicity

2021 ◽  
Author(s):  
Wentao Hu ◽  
Ke Yang ◽  
Alessandro Stroppa ◽  
Alessandra Continenza ◽  
Hua Wu
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Two Dimensional ◽  
Half Metallicity ◽  
Spintronic Devices ◽  
Half Metal

Two-dimensional ferromagnetic (2D FM) half-metal holds great potential for quantum magnetoelectronics and spintronic devices. Here, using density functional calculations and magnetic pictures, we study the electronic structure and magnetic properties...

Electronic structure of two-dimensional electron gases at differently prepared indium arsenide surfaces

2021 ◽  
Vol 555 ◽  
pp. 149516
Author(s):  
Jacek J. Kolodziej ◽  
Dawid Wutke ◽  
Jakub Lis ◽  
Natalia Olszowska
Keyword(s):  
Electronic Structure ◽  
Indium Arsenide ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Gases

Biaxial strain, electric field and interlayer distance-tailored electronic structure and magnetic properties of two-dimensional g-C3N4/Li-adsorbed Cr2Ge2Te6 van der Waals heterostructures

2021 ◽  
Vol 23 (10) ◽  
pp. 6171-6181
Author(s):  
Yaoqi Gao ◽  
Baozeng Zhou ◽  
Xiaocha Wang
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Electric Field ◽  
Van Der Waals ◽  
Interlayer Distance ◽  
Two Dimensional ◽  
Biaxial Strain ◽  
Van Der Waals Heterostructures

It is found that the biaxial strain, electric field and interlayer distance can effectively modulate the electronic structure and magnetic properties of two-dimensional van der Waals heterostructures.

scholarly journals Manipulation of hot carrier cooling dynamics in two-dimensional Dion–Jacobson hybrid perovskites via Rashba band splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jun Yin ◽  
Rounak Naphade ◽  
Partha Maity ◽  
Luis Gutiérrez-Arzaluz ◽  
Dhaifallah Almalawi ◽  
...  
Keyword(s):  
Transient Absorption ◽  
Phonon Scattering ◽  
Transient Absorption Spectroscopy ◽  
Band Model ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Hot Carrier ◽  
Band Splitting ◽  
Perovskite Materials ◽  
Spin Polarized

AbstractHot-carrier cooling processes of perovskite materials are typically described by a single parabolic band model that includes the effects of carrier-phonon scattering, hot phonon bottleneck, and Auger heating. However, little is known (if anything) about the cooling processes in which the spin-degenerate parabolic band splits into two spin-polarized bands, i.e., the Rashba band splitting effect. Here, we investigated the hot-carrier cooling processes for two slightly different compositions of two-dimensional Dion–Jacobson hybrid perovskites, namely, (3AMP)PbI4 and (4AMP)PbI4 (3AMP = 3-(aminomethyl)piperidinium; 4AMP = 4-(aminomethyl)piperidinium), using a combination of ultrafast transient absorption spectroscopy and first-principles calculations. In (4AMP)PbI4, upon Rashba band splitting, the spin-dependent scattering of hot electrons is responsible for accelerating hot-carrier cooling at longer delays. Importantly, the hot-carrier cooling of (4AMP)PbI4 can be extended by manipulating the spin state of the hot carriers. Our findings suggest a new approach for prolonging hot-carrier cooling in hybrid perovskites, which is conducive to further improving the performance of hot-carrier-based optoelectronic and spintronic devices.

Nonvolatile electrical control of 2D Cr2Ge2Te6 and intrinsic half metallicity in multiferroic hetero-structures

Nanoscale ◽  
2021 ◽  
Author(s):  
Asif Ilyas ◽  
Shuling Xiang ◽  
Miaogen Chen ◽  
Muhammad Yar Khan ◽  
Hua Bai ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Two Dimensional ◽  
Half Metallicity ◽  
Spintronic Devices ◽  
Electrical Control

The electrical control of two-dimensional (2D) van der Waals ferromagnets is a step forward for the realization of spintronic devices.

Discovery of intrinsic two-dimensional antiferromagnets from transition-metal borides

Nanoscale ◽  
2021 ◽  
Author(s):  
Shiyao Wang ◽  
Nanxi Miao ◽  
Kehe Su ◽  
Vladislav A. Blatov ◽  
Junjie Wang
Keyword(s):  
Transition Metal ◽  
Magnetic Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Metal Borides

Intrinsic two-dimensional (2-D) magnets are promising materials for developing advanced spintronic devices. Few have already been synthesized from the exfoliation of the van der Waals magnetic materials. In this work,...

Ferromagnetic Dirac Half-Metallicity in Transition Metal Embedded Honeycomb Borophene

2021 ◽  
Author(s):  
Yanxia Wang ◽  
Xue Jiang ◽  
Yi Wang ◽  
Jijun Zhao
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Valence Electron ◽  
Two Dimensional ◽  
First Principles Calculations ◽  
Next Generation ◽  
Half Metallicity ◽  
Counting Rule ◽  
Spintronic Devices ◽  
Electron Counting

Exploring two-dimensional (2D) ferromagnetic materials with intrinsic Dirac half-metallicity is crucial for the development of next-generation spintronic devices. Based on first-principles calculations, here we propose a simple valence electron-counting rule...

Site-projected electronic structure of two-dimensional Ti3C2MXene: the role of the surface functionalization groups

2016 ◽  
Vol 18 (45) ◽  
pp. 30946-30953 ◽  
Author(s):  
Damien Magne ◽  
Vincent Mauchamp ◽  
Stéphane Célérier ◽  
Patrick Chartier ◽  
Thierry Cabioc'h
Keyword(s):  
Electronic Structure ◽  
Surface Functionalization ◽  
Chemical Bonding ◽  
Surface Groups ◽  
Two Dimensional ◽  
Object Level

The role of the surface groups in chemical bonding in two dimensional Ti3C2is evidenced at the nano-object level.

Hypercoordinate Two-dimensional Transition-metal Borides for Spintronics and Catalyst Applications

2021 ◽  
Author(s):  
Shiyao Wang ◽  
Mohammad Khazaei ◽  
Junjie Wang ◽  
Hideo Hosono
Keyword(s):  
Transition Metal ◽  
Magnetic Materials ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Metal Borides

Two-dimensional (2-D) magnetic materials are promising to be ideal platforms for constructing novel spintronic devices. Until to now, most 2-D magnetic materials have mainly been achieved by the exfoliation of...

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