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Article
Fractionalized electrons in moiré materials
In the 1980s, the discovery of electron states that fractionalize in the presence of a time-reversal symmetry breaking magnetic field opened up new directions in condensed matter physics. In 2023, evidence has...
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Article
Electrical switching of magnetic order in an orbital Chern insulator
Magnetism typically arises from the joint effect of Fermi statistics and repulsive Coulomb interactions, which favours ground states with non-zero electron spin. As a result, controlling spin magnetism with el...
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Article
Electrical switching of the topological anomalous Hall effect in a non-collinear antiferromagnet above room temperature
The anomalous Hall effect is allowed by symmetry in some non-collinear antiferromagnets and is associated with Bloch-band topological features. This topological anomalous Hall effect is of interest in the deve...
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Article
Open AccessTwo-dimensional chiral topological superconductivity in Shiba lattices
The chiral p-wave superconductor is the archetypal example of a state of matter that supports non-Abelian anyons, a highly desired type of exotic quasiparticle. With this, it is foundational for the distant go...
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Article
Revealing the electronic band structure of quasi-free trilayer graphene on SiC(0001)
Recently, much attention has been devoted to trilayer graphene because it displays stacking and electric field dependent electronic properties well-suited for electronic and photonic applications [1-8]. Severa...
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Article
Competing ordered states with filling factor two in bilayer graphene
The quantum Hall effect, in which a two-dimensional sample’s Hall conductivities become quantized, is a remarkable transport anomaly commonly observed at strong magnetic fields. However, it may also appear at ...
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Chapter
Symmetry Breaking in Graphene’s Quantum Hall Regime: The Competition Between Interactions and Disorder
Graphene is a two-dimensional carbon material with a honeycomb lattice and Dirac-like low-energy excitations. When Zeeman interaction is neglected its Landau levels are four-fold degenerate, explaining the 4e ...
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Article
Theoretical studies of single magnetic impurities on the surface of semiconductors and topological insulators
We present results of theoretical studies of transition metal dopants in GaAs, based on microscopic tight-binding model andab-initio calculations. We focus in particular on how the vicinity of surface affects the...
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Article
Strong Coulomb drag and broken symmetry in double-layer graphene
Coulomb drag is a frictional coupling between electric currents flowing in spatially separated conducting layers. It is caused by interlayer electron–electron interactions. Previously, only the regime of weak (d≫
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Article
Transport spectroscopy of symmetry-broken insulating states in bilayer graphene
Bilayer graphene is an attractive platform for studying new two-dimensional electron physics1,2,3,4,5, because its flat energy bands are sensitive to out-of-plane electric fields and these bands magnify electron–...
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Article
How to make a bilayer exciton condensate flow
Among the many examples of Bose condensation considered in physics, electron–hole-pair (exciton) condensation has maintained special interest because of controversy about condensate properties. Although ideal ...
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Article
Ferromagnetic semiconductors: moving beyond (Ga,Mn)As
The recent development of MBE techniques for growth of III–V ferromagnetic semiconductors has created materials with exceptional promise in spintronics, that is, electronics that exploit carrier spin polarizat...
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Article
Bose–Einstein condensation of excitons in bilayer electron systems
An exciton is the particle-like entity that forms when an electron is bound to a positively charged ‘hole’. An ordered electronic state in which excitons condense into a single quantum state was proposed as a ...
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Article
Noncollinear Ground States in Ferromagnetic (III,Mn)V Semiconductors
Disorder-induced noncollinear ferromagnetism is a common feature of kinetic-exchange models for ferromagnetic (III,Mn)V semiconductors with randomly distributed Mn ions. The instability of the collinear state is ...
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Chapter
Spin Transport in Diluted Magnetic Semiconductor Superlattices
We are concerned with nonlinear electron transport in magnetically doped II-VI semiconductor multiple quantum wells with the central well doped with Mn. A II-VI compound with Mn substituted at the group II sit...
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Chapter
Ferromagnetism in (III,Mn) V Semiconductors
Ferromagnetism occurs when Mn is randomly substituted for more than about 2 percent of the cations of several III–V compound semiconductors. Although only a few host materials have been explored at present, th...
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Chapter and Conference Paper
Non-linear Transport in Quantum-Hall Smectics
Recent transport experiments have established that two-dimensional electron systems with high-index partial Landau level filling, ν* = ν − [ν], have ground states with broken orientational symmetry. In a mean-fie...
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Chapter and Conference Paper
Evidence for Ising Ferromagnetism and First-Order Phase Transitions in the Two-Dimensional Electron Gas
The two-dimensional (2D) electron gas in the quantum Hall regime offers unique possibilities to study the impact of many-body correlations under well-controlled conditions. One of the fields to which quantum H...
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Chapter and Conference Paper
Spintronic Spin Accumulation and Thermodynamics
The spin degree of freedom can play an essential role in determining the electrical transport properties of spin-polarized electron systems in metals or semiconductors. In this article, I address the dependenc...
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Chapter and Conference Paper
Skyrmions in the quantum hall effect
The lowest energy charged excitations of the filling factor ν=1 quantum Hall ferromagnet are Skyrmions. The net spin of the Skyrmion’s is always larger than 1/2, in such a way that adding or removing charge from ...
