23 papers · ranked by Valyu relevance
Cui‐Zu Chang, Chao‐Xing Liu, A. H. MacDonald
The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators - topologically non-trivial states of two-dimensional matter with broken time-reversal symmetry. In Chern insulators, non-trivial bulk band topology is…
Hideo Aoki
Integer quantum Hall effect, which is the Hall effect quantized into integer times $e^2/h$ ($e$: elementary charge, $h$: Planck's constant) observed first in two-dimensional electron gases in strong magnetic fields, is reviewed from both theoretical and experimental standpoints. Basic physics underlying the phenomenon…
R. Wawrzyńczak, S. Galeski, J. Noky, Y. Sun + 2 more
The quasi-quantized Hall effect (QQHE) is the three-dimensional (3D) counterpart of the integer quantum Hall effect (QHE), exhibited only by two-dimensional (2D) electron systems. It has recently been observed in layered materials, consisting of stacks of weakly coupled 2D platelets that are yet characterized by a 3D…
Sergey A. Mikhailov, Orion Ciftja
The fractional quantum Hall effect was experimentally discovered in 1982. It was observed that the Hall conductivity $σ_{yx}$ of a two-dimensional electron system is quantized, $(σ_{yx}=e2/3h)$, in the vicinity of the Landau level filling factor $(ν=1/3)$. In 1983, Laughlin proposed a trial many-body wave function…
Siyu Zhou, Mengjian Zhu, Qiang Liu, Yang Xiao + 3 more
'Chucai Guo' 'Jean-Pierre Bucher'] Since the discovery of the quantum Hall effect in 1980, it has attracted intense interest in condensed matter physics and has led to a new type of metrological standard by utilizing the resistance quantum. Graphene, a true two-dimensional electron gas material, has demonstrated the…
Börge Göbel, Ingrid Mertig
The quantum Hall effect emerges when two-dimensional samples are subjected to strong magnetic fields at low temperatures: Topologically protected edge states cause a quantized Hall conductivity in multiples of e 2 /h. Here we show that the quantum Hall effect is accompanied by an orbital Hall effect. Our quantum…
M. A. Hidalgo
We present a theoretical framework to describe the integer quantum Hall effect (IQHE) in three-dimensional (3D) electron systems. This extends our previous single-electron approach, which was successfully applied to two-dimensional (2D) systems such as semiconductor quantum wells and graphene, where it provided…
Daniel Kaplan, Tobias Holder, Binghai Yan
Can a generic magnetic insulator exhibit a Hall current? The quantum anomalous Hall effect (QAHE) is one example of an insulating bulk carrying a quantized Hall conductivity while insulators with zero Chern number present zero Hall conductance in the linear response regime. Here, we find that a general magnetic…
Johannes Gooth, Stanisław Gałeski, Tobias Meng
The discovery of the quantum Hall effect (QHE) in 1980 marked a turning point in condensed matter physics: given appropriate experimental conditions, the Hall conductivity of a two-dimensional (2D) electron system is exactly quantized. But what happens to the QHE in three dimensions (3D)? Experiments over the past 40…
Tianwei Zhou, T. Beller, G. Masini, Jacopo Parravicini + 6 more
simulator Authors: ['Tianwei Zhou' 'T. Beller' 'G. Masini' 'Jacopo Parravicini' 'Giacomo Cappellini' 'Cécile Repellin' 'Thierry Giamarchi' 'Jacopo Catani' 'Michele Filippone' 'L. Fallani'] The Hall effect [1–4] has a paramount role in a wide range of disciplines, from applied sciences [5, 6] to the fundamental…
Simrandeep Kaur, Singh, Harsimran, Kenji Watanabe + 6 more
We present a detailed experimental study of the particle-hole symmetry (PHS) of the fractional quantum Hall (FQH) states about half filling in a multiband system. Specifically, we focus on the lowest Landau level of the monolayer-like band of Bernal stacked trilayer graphene (TLG). In pristine TLG, the excitation…
Shuai Li, Tianyu Liu, Chang Liu, Yayu Wang + 2 more
Topological materials, which feature robust surface and/or edge states, have now been a research focus in condensed matter physics. They represent a new class of materials exhibiting nontrivial topological phases, and provide a platform for exploring exotic transport phenomena, such as the quantum anomalous Hall effect…
Kajetan M. Fijalkowski, Nan Liu, Pankaj Mandal, Steffen Schreyeck + 3 more
'Karl Brunner' 'Charles Gould' 'Laurens W. Molenkamp'] Title: Abstract The recent advent of topological states of matter spawned many significant discoveries. The quantum anomalous Hall (QAH) effect is a prime example due to its potential for applications in quantum metrology, as well as its influence on fundamental…
Xue Wang, Lei Xu, Filippo Giannazzo, Ivan Shtepliuk
We investigate the band structures and transport properties of a zigzag-edged bent bilayer graphene nanoribbon under a uniform perpendicular magnetic field. Due to its unique geometry, the edge and interface states can be controlled by an electric field or local potential, and the conductance exhibits interesting…
Michael Sabatini Mattei, Boyuan Liu, Gerardo A. Mazzei Capote, Zijie Liu + 3 more
Photonic topological insulators have emerged as an exciting new platform for backscatter-free waveguiding even in the presence of defects, with applications in robust long-range energy and quantum information transfer, low-threshold lasing, and chiral quantum optics. We demonstrate a design for spin-Hall photonic…
Michael Toriyama, G. Jeffrey Snyder
Band inversion is a physical phenomenon which may cause warping of the bulk band structure in topological insulators, generating multiple electronic valleys for conducting carriers. However, the conditions under which band inversion induces warping are not well understood. Here, we derive two general conditions which…
Bartosz Krajnik, Monika Maciejewska, Stanisław Janeczko, Andrzej Szczurek
The queen bee is the central individual responsible for colony establishment, growth, and survival. Reliable confirmation of successful mating, continued queen presence, and normal reproductive performance is essential for effective colony management. We present a queen bee detection system based on an array of…
Ning Cao, William Bro-Jørgensen, Xiaohong Zheng, Gemma Solomon
Quantum interference effects in conjugated molecules have been well explored, with benzene frequently invoked as a pedagogical example. These interference effects have been understood through a quantum interference map in which the electronic transmission is separated into interfering and non-interfering terms, with a…
Alan Tai
This study presents a quantum well model using transfer matrix to analyse the charge transfer characteristic in DNA nanostructure sequences. The unconfined state or unbound state above the quantum well are used to investigate the carrier behaviours in nanostructure of semiconductor. Similar analysis and simulations can…
Alexandra Siklitskaya, Tomasz Bednarek, James Pogrebetsky, Adam Kubas
Friedel oscillations are quantum mechanical phenomena observed as oscillatory variations in electron density due to the presence of impurity or defect in a media containing electron gas. FOs profoundly influence surface properties, including the ordering of adsorbates and surface-mediated interactions crucial for…
Marco Vitek, Jie-Ren Deng, Harry L. Anderson, Igor Rončević
The ability of a ring-shaped molecule to sustain a global ring current, when placed in a magnetic field, indicates that its electronic wavefunction is coherently delocalized around its whole circumference. Large molecules that display this behavior are attractive components for molecular electronic devices because it…
Authors not listed
Zig-zag graphene nanoribbons (ZGNRs) exhibit symmetric spin distributions on their edges, making them susceptible to perturbations due to molecular adsorption. This study investigates the impact of adsorption of closed-shell (e.g. N2, CO, CO2) and open-shell paramagnetic (e.g. O2, NO, NO2) molecules on the…
Takeshi Yasuda, Nakako Nakajima, Tomoko Yanaka, Takaya Gotoh + 3 more
Quantum tunneling is a phenomenon in which small quantum particles pass through a reaction energy barrier, as if they were passing through a tunnel opened in the barrier. In this study, we analyzed the involvement of the quantum tunneling effect in enzymatic chemical reactions involving hydrolysis in vitro, by…