Magnetoexcitons in cuprous oxide

Schweiner, Frank; Main, Jörg; Wunner, Günter; Freitag, M.; Heckötter, Julian; Uihlein, Ch.; Aßmann, Marc; Fröhlich, D.; Bayer, М.

doi:10.1103/physrevb.95.035202

Cited by 55 publications

(128 citation statements)

References 40 publications

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“…This coupling possibly leads to a broadening of the excitonic spectral lines. At this point, we emphasize that for a precise study we have to compare the potential spacing V (i) ∆ with the binding energies of the field-dressed excitonic species as they have been analyzed in recent experimental studies [19]. However, in this particular work it was shown that for magnetic field strengths up to 3 T the energetic shift due to the external magnetic field is of the order of several hundreds of µeV compared to the fieldfree ground state energy.…”

Section: Inclusion Of Spin Couplingsmentioning

confidence: 99%

“…Because ∆/E g 1, the minimum positions of these wells are well approximated by Eq. (19), which directly gives |z…”

Section: Inclusion Of Spin Couplingsmentioning

confidence: 99%

“…The quantityμ B ≈ 0.18/B denotes the (scaled) Bohr magneton and g s ≈ 2 is the gfactor of the hole spin. The value of the Luttinger parameter κ has been determined recently to be κ = −0.5 ± 0.1 via high-resolution spectroscopy of magnetoexcitons in Cu 2 O [19]. Next, we introduce the center-of-mass vector R and the relative vector r = r e − r h .…”

Section: The Excitonic Hamiltonian In External Electric and Magnementioning

confidence: 99%

“…Due to specific material parameters, excitonic properties such as Bohr radius and electric/magnetic field strength units provide the possibility to access exotic regimes more easily compared to standard atomic systems. For instance, recent high-resolution spectroscopy and intensive theoretical calculations of excitons in Cu 2 O have provided a fundamental understanding of complex excitonic absorption spectra in external magnetic fields for applied field strengths of up to 7 T and excitonic states with principal quantum numbers n ≤ 7 [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Excitonic giant-dipole potentials in cuprous oxide

2017

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In this work we predict the existence of a novel species of Wannier excitons when exposed to crossed electric and magnetic fields. In particular, we present a theory of giant-dipole excitons in Cu2O in crossed fields. Within our theoretical approach we perform a pseudoseparation of the centerof-mass motion for the field-dressed excitonic species, thereby obtaining an effective single-particle Hamiltonian for the relative motion. For arbitrary gauge fields we exactly separate the gaugedependent kinetic energy terms from the effective single-particle interaction potential. Depending on the applied field strengths and the specific field orientation, the potential for the relative motion of electron and hole exhibits an outer well at spatial separations up to several micrometers and depths up to 380 µeV, leading to possible permanent excitonic electric dipole moments of around three million Debye.

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Section: Inclusion Of Spin Couplingsmentioning

confidence: 99%

“…Because ∆/E g 1, the minimum positions of these wells are well approximated by Eq. (19), which directly gives |z…”

Section: Inclusion Of Spin Couplingsmentioning

confidence: 99%

Section: The Excitonic Hamiltonian In External Electric and Magnementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Excitonic giant-dipole potentials in cuprous oxide

2017

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“…Only three years ago an almost perfect hydrogen-like absorption series has been observed in Cu 2 O up to a principal quantum number of n = 25 by T. Kazimierczuk et al [1]. This experiment has opened the field of research of giant Rydberg excitons and has stimulated a large number of experimental and theoretical investigations [2][3][4][5][6][7][8][9][10][11][12][13][14][15], in particular as concerns the level statistics and symmetry-breaking effects [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Exciton-phonon interaction breaking all antiunitary symmetries in external magnetic fields

2017

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Recent experimental investigations by M. Aßmann et al. [Nature Mater. 15, 741 (2016)] on the spectrum of magnetoexcitons in cuprous oxide revealed the statistics of a Gaussian unitary ensemble (GUE). The model of F. Schweiner et al. [Phys. Rev. Lett. 118, 046401 (2017)], which includes the complete cubic valence band structure of the solid, can explain the appearance of GUE statistics if the magnetic field is not oriented in one of the symmetry planes of the cubic lattice. However, it cannot explain the experimental observation of GUE statistics for all orientations of the field. In this paper we investigate the effect of quasi-particle interactions or especially the exciton-phonon interaction on the level statistics of magnetoexcitons and show that the motional Stark field induced by the exciton-phonon interaction leads to the occurrence of GUE statistics for arbitrary orientations of the magnetic field in agreement with experimental observations. Importantly, the breaking of all antiunitary symmetries can be explained only by considering both the exciton-phonon interaction and the cubic crystal lattice.

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Analysis of the Fine Structure of the D‐Exciton Shell in Cuprous Oxide

Heckötter

Rommel

Main

et al. 2021

Physica Rapid Research Ltrs

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The exciton states in cuprous oxide show a pronounced fine structure splitting associated with the crystal environment and the resulting electronic band structure. High‐resolution spectroscopy reveals an especially pronounced splitting of the yellow D excitons with one state pushed above any other state with the same principal quantum number. This large splitting offset is related to a strong mixing of these D states with the 1S exciton of the green series, as suggested by previously published calculations. Here, a detailed comparison of this theory with experimental data is given, which leads to a complete reassignment of the experimentally observed D exciton lines. The origin of different amounts of green admixture to D‐envelope states is deduced by analyzing the different terms of the Hamiltonian. The yellow–green mixing leads to level repulsion and induces an exchange interaction splitting to D‐envelope states, from which one of them becomes the highest state within each multiplet. Furthermore, the assignment of D exciton states according to their total angular momentum F is given and corrects an earlier description given in a former study.

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Magnetoexcitons in cuprous oxide

Cited by 55 publications

References 40 publications

Excitonic giant-dipole potentials in cuprous oxide

Excitonic giant-dipole potentials in cuprous oxide

Exciton-phonon interaction breaking all antiunitary symmetries in external magnetic fields

Analysis of the Fine Structure of the D‐Exciton Shell in Cuprous Oxide

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