Superfluidity of excitons in a high magnetic field

Korolev, Andrei V.; Liberman, M. A.

doi:10.1103/physrevlett.72.270

Cited by 38 publications

(16 citation statements)

References 9 publications

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“…Hereby the ground state of the hydrogen molecule is of particular interest. Recently a controversial discussion arose concerning the electronic structure of a hydrogen molecule in a superstrong magnetic field [30,[32][33][34][35][36][37]. It was conjectured that in superstrong magnetic fields the 3 Σ u state would be the ground state of H 2 [32].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen molecule in magnetic fields: The ground states of the Σ manifold of the parallel configuration

et al. 1997

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The electronic structure of the hydrogen molecule is investigated for the parallel configuration. The ground states of the ⌺ manifold are studied for ungerade and gerade parity as well as singlet and triplet states covering a broad regime of field strengths from Bϭ0 up to Bϭ100 a.u. A variety of interesting phenomena can be observed. For the 1 ⌺ g state we found a monotonous decrease of the equilibrium distance and a simultaneous increase of the dissociation energy with growing magnetic-field strength. The 3 ⌺ g state is shown to develop an additional minimum which has no counterpart in field-free space. The 1 ⌺ u state shows a monotonous increase in the dissociation energy with a first increasing and then decreasing internuclear distance of the minimum. For this state the dissociation channel is H 2 →H Ϫ ϩH ϩ for magnetic field strengths Bտ20 a.u. due to the existence of strongly bound H Ϫ states in strong magnetic fields. The repulsive 3 ⌺ u state possesses a very shallow van der Waals minimum for magnetic-field strengths smaller than 1.0 a.u. within the numerical accuracy of our calculations. The 1 ⌺ g and 3 ⌺ u states cross as a function of B and the 3 ⌺ u state, which is an unbound state, becomes the ground state of the hydrogen molecule in magnetic fields Bտ0.2 a.u. This is of particular interest for the existence of molecular hydrogen in the vicinity of white dwarfs. In superstrong fields the ground state is again a strongly bound state, the 3 ⌸ u state.

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Section: Introductionmentioning

confidence: 99%

Hydrogen molecule in magnetic fields: The ground states of the Σ manifold of the parallel configuration

et al. 1997

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“…The magnetic field does not change the nature of Lorentzian excitons (LX), but strongly affects their internal structure, contracting the relative motion wave functions, f n ͑r͒, by a factor~j Bj 1͞2 perpendicular to the field, and by a factor~ln j Bj parallel to it [11]. This confinement is expected to affect their nonlinear optical response.…”

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confidence: 98%

Magnetically Enhanced Exciton-Exciton Correlations in Semiconductors

et al. 1997

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We present investigations of fs time resolved coherent wave mixing under high magnetic field. Our experiments reveal a new regime at high magnetic field and low excitation density dominated by the Coulomb interaction. This regime is inconsistent with the semiconductor Bloch equations. A model which includes exciton-exciton correlation successfully describes many features of this regime.[S0031-9007(97)

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“…7 Several works have argued that the utilization of homogeneous magnetic fields during the trapping of excitons in semiconductors quantum wells will enhance Bose-Einstein effects in a gas of excitons. 8 In particular, Ref. [9] reported a strong increase of the exciton confinement properties above a critical threshold of uniform magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Fine structure of excitons in a quantum well in the presence of a nonhomogeneous magnetic field

Freire¹,

Peeters²,

Matulis³

et al. 2000

Phys. Rev. B

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The trapping of excitons in a semiconductor quantum well due to a circular symmetric nonhomogeneous magnetic field is studied. The effect of the spin state of the exciton on its trapping energy is analyzed, and the importance of the interaction of the orbital and spin Zeeman effect as compared to the diamagnetic term in the exciton Hamiltonian is emphasized. Magnetic field profiles are considered, which can experimentally be created through the deposition of ferromagnetic disks on top of a semiconductor heterostructure. This setup gives rise to a magnetic dipole type of profile in the xy plane of the exciton motion. We find that the spin direction of the exciton influences its localization by changing the confinement region in the effective potential. The exciton confinement increases with magnetic field intensity, and this is more pronounced when the exciton g-factor is different from zero. The numerical calculations are performed for GaAs/AlxGa1−xAs quantum wells and we show that it open up a new realistic path for experiments designed to probe exciton trapping in semiconductors. 71.35.Ji, 75.70.Cn, 71.70.Ej

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Superfluidity of excitons in a high magnetic field

Cited by 38 publications

References 9 publications

Hydrogen molecule in magnetic fields: The ground states of the Σ manifold of the parallel configuration

Hydrogen molecule in magnetic fields: The ground states of the Σ manifold of the parallel configuration

Magnetically Enhanced Exciton-Exciton Correlations in Semiconductors

Fine structure of excitons in a quantum well in the presence of a nonhomogeneous magnetic field

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