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 Energy and momentum distribution of fractional excitations in helical systemsCalzona, Alessio  ; ; Dolcetto, Giacomo et alPoster (2017, September 05) Detailed reference viewed: 113 (2 UL)  Charge and energy fractionalization mechanism in one-dimensional channels; Calzona, Alessio ; Dolcetto, Giacomo et alin Physical Review. B, Condensed Matter and Materials Physics (2017), 96 We study the problem of injecting single electrons into interacting one-dimensional quantum systems, a fundamental building block for electron quantum optics. It is well known that such injection leads to ... [more ▼] We study the problem of injecting single electrons into interacting one-dimensional quantum systems, a fundamental building block for electron quantum optics. It is well known that such injection leads to charge and energy fractionalization. We elucidate this concept by calculating the nonequilibrium electron distribution function in the momentum and energy domains after the injection of an energy-resolved electron. Our results shed light on how fractionalization occurs via the creation of particle-hole pairs by the injected electron. In particular, we focus on systems with a pair of counterpropagating channels, and we fully analyze the properties of each chiral fractional excitation which is created by the injection. We suggest possible routes to access their energy and momentum distribution functions in topological quantum Hall or quantum spin-Hall edge states. [less ▲] Detailed reference viewed: 288 (10 UL)Energy and momentum distribution of fractional excitations in 1D counterpropagating systemsCalzona, Alessio ; ; Dolcetto, Giacomo et alPoster (2017, July 25) Detailed reference viewed: 105 (1 UL)Fractional charge oscillations in quantum spin Hall quantum dots; ; Dolcetto, Giacomo et alE-print/Working paper (2016) We show that correlated two-particle backscattering can induce fractional charge oscillations in a quantum dot built at the edge of a two-dimensional topological insulator by means of magnetic barriers ... [more ▼] We show that correlated two-particle backscattering can induce fractional charge oscillations in a quantum dot built at the edge of a two-dimensional topological insulator by means of magnetic barriers. The result nicely complements recent works where the fractional oscillations were obtained employing of semiclassical treatments. Moreover, since by rotating the magnetization of the barriers a fractional charge can be trapped in the dot via the Jackiw-Rebbi mechanism, the system we analyze offers the opportunity to study the interplay between this noninteracting charge fractionalization and the fractionalization due to two-particle backscattering. In this context, we demonstrate that the number of fractional oscillations of the charge density depends on the magnetization angle. Finally, we address the renormalization induced by two-particle backscattering on the spin density, which is characterized by a dominant oscillation, sensitive to the Jackiw-Rebbi charge, with a wavelength twice as large as the charge density oscillations. [less ▲] Detailed reference viewed: 132 (3 UL)Emission of entangled Kramers pairs from a helical mesoscopic capacitorDolcetto, Giacomo ; Schmidt, Thomas in Physical Review. B (2016), 94(7), 075444 The realization of single-electron sources in integer quantum Hall systems has paved the way for exploring electronic quantum optics experiments in solid-state devices. In this work, we characterize a ... [more ▼] The realization of single-electron sources in integer quantum Hall systems has paved the way for exploring electronic quantum optics experiments in solid-state devices. In this work, we characterize a single Kramers pair emitter realized by a driven antidot embedded in a two-dimensional topological insulator, where spin-momentum locked edge states can be exploited for generating entanglement. Contrary to previous proposals, the antidot is coupled to both edges of a quantum spin Hall bar, thus enabling this mesoscopic capacitor to emit an entangled two-electron state. We study the concurrence $C$ of the emitted state and the efficiency $F$ of its emission as a function of the different spin-preserving and spin-flipping tunnel couplings of the antidot with the edges. We show that the efficiency remains very high ($Fgeq 50) even for maximally entangled states ($C=1$). We also discuss how the entanglement can be probed by means of noise measurements in a simple two-terminal setup. [less ▲] Detailed reference viewed: 196 (8 UL)Generic Helical Liquids: Theory & ApplicationsRod, Alexia ; Dolcetto, Giacomo ; et alPoster (2016, August 23) Detailed reference viewed: 135 (21 UL)Transport through a quantum spin Hall antidot as a spectroscopic probe of spin texturesRod, Alexia ; Dolcetto, Giacomo ; et alin Physical Review. B (2016), 94 We investigate electron transport through an antidot embedded in a narrow strip of two-dimensional topological insulator. We focus on the most generic and experimentally relevant case with broken axial ... [more ▼] We investigate electron transport through an antidot embedded in a narrow strip of two-dimensional topological insulator. We focus on the most generic and experimentally relevant case with broken axial spin symmetry. Spin-non-conservation allows additional scattering processes which change the transport properties profoundly. We start from an analytical model for noninteracting transport, which we also compare with a numerical tight-binding simulation. We then extend this model by including Coulomb repulsion on the antidot, and we study the transport in the Coulomb-blockade limit. We investigate sequential tunneling and cotunneling regimes, and we find that the current-voltage characteristic allows a spectroscopic measurement of the edge-state spin textures. [less ▲] Detailed reference viewed: 219 (11 UL)Emission of entangled Kramers pairs from a helical mesoscopic capacitorDolcetto, Giacomo Poster (2016, July) Detailed reference viewed: 202 (5 UL)Spin-thermoelectric transport induced by interactions and spin-flip processes in two dimensional topological insulators; ; Dolcetto, Giacomo et alin Physical Review. B (2016), 93(16), 165414 Detailed reference viewed: 152 (9 UL)Probing the spin texture of generic helical edge states with an antidotRod, Alexia ; Dolcetto, Giacomo ; et alScientific Conference (2016, March 07) Detailed reference viewed: 93 (9 UL)Spin fractionalization in topological insulatorsDolcetto, Giacomo Presentation (2016, March 07) Detailed reference viewed: 124 (11 UL)Transport properties of the helical edge states in two-dimensional topological insulatorsDolcetto, Giacomo Presentation (2016, January) Detailed reference viewed: 202 (12 UL)Edge physics in two-dimensional topological insulatorsDolcetto, Giacomo ; ; Schmidt, Thomas in La Rivista del Nuovo Cimento (2016) Detailed reference viewed: 242 (4 UL)Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devices; ; Dolcetto, Giacomo et alin Physical Review. B (2015) Detailed reference viewed: 182 (23 UL)Time-resolved pure spin fractionalization and spin-charge separation in helical Luttinger liquid based devicesDolcetto, Giacomo Presentation (2015, September) Detailed reference viewed: 90 (5 UL) |
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