Spin-dependent coherent transport of two-dimensional excitons

Durnev, M. V.; Glazov, M. M.

doi:10.1103/physrevb.93.155409

Cited by 11 publications

(11 citation statements)

References 39 publications

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“…The shape of the lower part of the Dirac cone and its relative position to the Γ 8 hh states gives an opportunity for the experimental investigation of this TSS part as it is also for the strained 2D system. As shown by the other authors the theoretical and experimental investigation of both upper and lower part of the Dirac cones in case of the HgTe QW provides a lot of interesting results [44][45][46][47][48]. The 2D and 3D strained structures with the TSS dispersion relation similar to that obtained for HgTe QW should be a very interesting experimental object for further verification of all these effects.…”

Section: Discussionsupporting

confidence: 58%

Formation Dirac point and the topological surface states for HgCdTe-QW and mixed 3D HgCdTe TI

Marchewka

2016

EPJ Web Conf.

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Abstract. In this paper the results of numerical calculations based on the finite difference method (FDM) for the 2D and 3D TI with and without uniaxial tensile strain for mixed Hg 1-x Cd x Te structures are presented. The numerical calculations were made using the 8x8 model for x from 0 up to 0.155 and for the wide range for the thickness from a few nm for 2D up to 150 nm for 3D TI as well as for different mismatch of the lattice constant and different barrier potential in the case of the QW. For the investigated region of the Cd composition (x value) the negative energy gap (E g =* 8 -* 6 ) in the Hg 1-x Cd x Te is smaller than in the case of pure HgTe which, as it turns out, has a significant influence on the topological surface states (TSS) and the position of the Dirac point for QW as well as for 3D TI. The results show that the strained gap and the position of the Dirac point against the * 8 is a function of the x-Cd compounds in the case of the 3D TI as well as the critical width of the mixed Hg 1-x Cd x Te QW.

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Section: Discussionsupporting

confidence: 58%

Formation Dirac point and the topological surface states for HgCdTe-QW and mixed 3D HgCdTe TI

Marchewka

2016

EPJ Web Conf.

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“…Finally, we believe that a similar physics might be observed in indirect exciton gases with spin-orbit Rashba or Dresselhaus interaction in the limit of large exchange interaction between the electron and hole within the exciton. Indeed, as it has been shown in [35], the indirect exciton Hamiltonian has a form which exactly coincides with the EP Hamiltonian in the presence of the TE-TM splitting.…”

supporting

confidence: 65%

“…Indeed, as it has been shown in ref. 48 , the indirect exciton Hamiltonian has a form which exactly coincides with the EP Hamiltonian in the presence of the TE-TM splitting.…”

Section: Resultsmentioning

confidence: 78%

Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

Kovalev

Savenko

2017

Sci Rep

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We study the pseudo-spin density response of a disordered two-dimensional spin-polarized Bose gas to weak alternating magnetic field, assuming that one of the spin states of the doublet is macroscopically occupied and Bose-condensed while the occupation of the other state remains much smaller. We calculate spatial and temporal dispersions of spin susceptibility of the gas taking into account spin-flip processes due to the transverse-longitudinal splitting, considering microcavity exciton polaritons as a testbed. Further, we use the Bogoliubov theory of weakly-interacting gases and show that the time-dependent magnetic field power absorption exhibits double resonance structure corresponding to two particle spin states (contrast to paramagnetic resonance in regular spin-polarized electron gas). We analyze the widths of these resonances caused by scattering on the disorder and show that, in contrast with the ballistic regime, in the presence of impurities, the polariton scattering on them is twofold: scattering on the impurity potential directly and scattering on the spatially fluctuating condensate density caused by the disorder. As a result, the width of the resonance associated with the Bose-condensed spin state can be surprisingly narrow in comparison with the width of the resonance associated with the non-condensed state.

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“…Finally, we discuss the role of spin-orbital corrections resulting from bulk inversion asymmetry (BIA) [17] of zinc-blend crystals and interface inversion asymmetry (IIA) [18] on the behaviour of zero-mode LLs. Both reasons induce the anticrossing of zero-mode LLs in the vicinity of B c .…”

Section: Ponent [2] and Its Energy Increases With Bmentioning

confidence: 99%

Temperature-Induced Topological Phase Transition in HgTe Quantum Wells

et al. 2018

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We report a direct observation of temperature-induced topological phase transition between the trivial and topological insulator states in an HgTe quantum well. By using a gated Hall bar device, we measure and represent Landau levels in fan charts at different temperatures, and we follow the temperature evolution of a peculiar pair of "zero-mode" Landau levels, which split from the edge of electronlike and holelike subbands. Their crossing at a critical magnetic field B_{c} is a characteristic of inverted band structure in the quantum well. By measuring the temperature dependence of B_{c}, we directly extract the critical temperature T_{c} at which the bulk band gap vanishes and the topological phase transition occurs. Above this critical temperature, the opening of a trivial gap is clearly observed.

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Spin-dependent coherent transport of two-dimensional excitons

Cited by 11 publications

References 39 publications

Formation Dirac point and the topological surface states for HgCdTe-QW and mixed 3D HgCdTe TI

Formation Dirac point and the topological surface states for HgCdTe-QW and mixed 3D HgCdTe TI

Paramagnetic resonance in spin-polarized disordered Bose-Einstein condensates

Temperature-Induced Topological Phase Transition in HgTe Quantum Wells

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