Magneto-optical study of Li and Na acceptor bound excitons in CdTe: Fine structure and cubic crystal-field effect

Molva, E.; Dang, Le Si

doi:10.1103/physrevb.32.1156

Cited by 28 publications

(6 citation statements)

References 23 publications

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“…With the detection polarization determined as discussed above, we find peak splitting and selection rules for CdTe in agreement with those found by Refs. [48][49][50]. In particular, given that the lowest energy acceptor-bound exciton luminescence peak for CdTe is σ − polarized (for B > 0), we know that the lowest energy MoSe 2 peak indeed originates from σ + polarized luminescence (for B > 0) as indicated in the main text.…”

Section: Experimental Determination Of the Sign Of The Valley Splittingmentioning

confidence: 72%

Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2

et al. 2015

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Using polarization-resolved photoluminescence spectroscopy, we investigate breaking of valley degeneracy by out-of-plane magnetic field in back-gated monolayer MoSe2 devices. We observe a linear splitting of −0.22 meV T between luminescence peak energies in σ+ and σ− emission for both neutral and charged excitons. The optical selection rules of monolayer MoSe2 couple photon handedness to the exciton valley degree of freedom, so this splitting demonstrates valley degeneracy breaking. In addition, we find that the luminescence handedness can be controlled with magnetic field, to a degree that depends on the back-gate voltage. An applied magnetic field therefore provides effective strategies for control over the valley degree of freedom.

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Section: Experimental Determination Of the Sign Of The Valley Splittingmentioning

confidence: 72%

Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2

et al. 2015

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“…3 well describes the angular dependence of the Zeeman splitting. The absolute values of g e , K, and c are significantly smaller than the values usually determined for defects in CdTe [3,4]. These observations suggest a model of strongly localised excitons, because a strong localisation is expected to reduce the values of g e , K, L, and c [13].…”

mentioning

confidence: 59%

“…for the initial bound-exciton state S The diamagnetic shift of an exciton recombination is well described by [4,5] …”

mentioning

confidence: 99%

“…A uniaxial stress is deduced because (i) two lines are observed for |B| = 0, and (ii) the Zeeman splitting is clearly anisotropic. If the two lines for |B| = 0 were caused by two different acceptors, each line would split into at least six components [4], and the Zeeman splitting would be nearly isotropic. The Zeeman splitting is analysed, using an effective spin Hamiltonian [3] H 1a2 g e m B S Á B 1…”

mentioning

confidence: 99%

“…Hence, the exciton cannot be bound to a neutral acceptor, because in the initial state of the acceptorbound exciton the angular momenta J 1 and J 2 of the two holes would be coupled to J 1 + J 2 = 0, which would make an interaction with the electron spin impossible, and in the final state there would be no electron. A coupling to J 1 + J 2 = 2 produces a completely different splitting pattern [4]. Similarly, an exciton bound to a neutral donor can be excluded.…”

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confidence: 99%

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Magneto-Optical Properties of a Hydrogen-Related Defect in CdTe

Hamann

Worschech

Blass

et al. 1998

phys. stat. sol. (b)

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Nominally undoped CdTe was exposed to a hydrogen plasma at 160 C. It has been shown that after this treatment, seven typical photoluminescence lines H 1 to H 7 are observed in the excitonic region. The dependence of the most intense of these hydrogen-related lines, H 3 , on external magnetic fields up to |B| = 7 T is investigated. The diamagnetic shift of the H 3 line is proportional to |B| 2 , showing that it is caused by the recombination of excitons. Since an electron±hole interaction is observed, the exciton is either bound to an isoelectronic defect or to an ionised donor. The anisotropy of the Zeeman splitting is explained in terms of a small uniaxial compressive strain in a [100] direction perpendicular to the [001] surface orientation. In contrast, the well-known copperbound exciton line, used as a reference, reveals uniaxial tensile strain in the same [100] direction. Therefore, the defects associated with the H 3 line either have a [100] symmetry or are incorporated close to [100] oriented extended defects. The electron g-factor is g e = ± ±1.50 AE 0.04, and the hole parameters are K = 0.40 AE 0.05 and L = 0.00 AE 0.04, describing the isotropic and the anisotropic Zeeman effect, respectively.Introduction. It has recently been shown that after the exposure of undoped CdTe to a hydrogen plasma at 160 C, seven new photoluminescence (PL) lines H 1 to H 7 are observed in the energy range between 1.575 and 1.591 eV. Since these lines are also visible after a 200 eV implantation of H + ions into CdTe, it was concluded that they are caused by the presence of hydrogen in CdTe [1,2]. High magnetic fields are a proper tool to investigate the electronic and microscopic structure of the associated defects. Only the H 1 , H 2 , and H 3 lines, however, are well isolated from each other and from other lines, which is favourable for magneto-optical investigations. In this paper, the results obtained from the H 3 line are presented, because this is the most intense line and thus yields the most reliable data. From the Zeeman splittings of the H 1 and H 2 lines, though not identical, similar conclusions can be drawn as for the H 3 line.Experimental Procedure. Nominally undoped, Bridgman-grown CdTe crystals were exposed to a hydrogen plasma at 160 C and 70 Pa for 1 h [1, 2]. The magneto-optical investigations were carried out at 1.7 K. The luminescence, excited by an Ar laser, was dispersed by a grating monochromator with a focal length of 1 m and detected by a 1 Corresponding

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Excitonic polaritons in transverse magnetic fields

Loginov¹,

Кочерешко²,

Cox³

et al. 2010

Physica Status Solidi (b)

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Exciton-polariton reflectivity of wide CdTe/CdZnTe quantumwells (with well widths exceeding by far the exciton Bohr radius) was measured in the Voigt geometry in a magnetic field. In a magnetic field, forbidden exciton lines were observed to appear for each exciton quantization level. The exciton diamagnetic shift constant was observed to decrease noticeably with increasing quantum number of the confined level. A comparison of calculated with experimental spectra reveals a growth of the exciton translational mass with increasing magnetic field. It has been shown that both the growth of mass and the decrease of the diamagnetic shift can be traced to mixing between exciton internal and translational motion states.

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Magneto-optical study of Li and Na acceptor bound excitons in CdTe: Fine structure and cubic crystal-field effect

Cited by 28 publications

References 23 publications

Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2

Breaking of Valley Degeneracy by Magnetic Field in MonolayerMoSe2

Magneto-Optical Properties of a Hydrogen-Related Defect in CdTe

Excitonic polaritons in transverse magnetic fields

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