Anna Pertsova

Magnetic polarons and large negative magnetoresistance in GaAs nanowires implanted with Mn ions.

We report on low-temperature magnetotransport and SQUID measurements on heavily doped Mn-implanted GaAs nanowires. SQUID data recorded at low magnetic fields exhibit clear signs of the onset of a spin-glass phase with a transition temperature of about 16 K. Magnetotransport experiments reveal a corresponding peak in resistance at 16 K and a large negative magnetoresistance, reaching 40% at 1.6 K and 8 T. The negative magnetoresistance decreases at elevated temperatures and vanishes at about 100 K. We interpret our transport data in terms of spin-dependent hopping in a complex magnetic nanowire landscape of magnetic polarons, separated by intermediate regions of Mn impurity spins, forming a paramagnetic/spin-glass phase.

Probing the wavefunction of the surface states in Bi2Se3 topological insulator: a realistic tight-binding approach

We report on microscopic tight-binding modeling of surfacestates in Bi

Effects of short-range electron-electron interactions in doped graphene

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Excitonic gap formation in pumped Dirac materials

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Local Magnetic Suppression of Topological Surface States in Bi2Te3 Nanowires

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Thin films of a three-dimensional topological insulator in a strong magnetic field: Microscopic study

three-dimensional topological insulator, based on a\textit{sp}

Electronic structure and magnetic properties of Mn and Fe impurities near the GaAs (110) surface

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Time-dependent electron transport through a strongly correlated quantum dot: multiple-probe open-boundary conditions approach.

Slater-Koster Hamiltonian, with parameters calcul ...

Quantum Hall edge states in topological insulator nanoribbons

We study theoretically the effects of short-range electron-electron interactions on the electronic structure of graphene, in the presence of substitutional impurities. Our computational approach is ...

Interplay between Mn-acceptor state and Dirac surface states in Mn-doped Bi2Se3 topological insulator

Recent pump-probe experiments demonstrate the possibility that Dirac materials may be driven into transient excited states describable by two chemical potentials, one for the electrons and one for ...