Magneto‐Reflectivity Measurements on Exciton Bands in CuCl

Staude, W.

doi:10.1002/pssb.2220430138

Cited by 69 publications

(14 citation statements)

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“…(3), we calculate the Rabi splitting energies of 3 and 1,2 using the values of LT : 5.7 meV for the Z 3 exciton 16 and 18 meV for the Z 1,2 exciton. 22 The solid(dashed) curve in Fig. 3 indicates the calculated active-layer-thickness dependence of 3 ( 1,2 ).…”

Section: Resultsmentioning

confidence: 98%

Control of exciton-photon interactions in CuCl microcavities

et al. 2011

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We have investigated the active-layer-thickness dependence of exciton-photon interactions in planar CuCl microcavities with HfO 2 /SiO 2 distributed Bragg reflectors. The active layer thickness was changed from λ/32 to λ/4, while the cavity length was fixed at λ/2. We performed angle-resolved reflectance measurements and clearly detected three cavity-polariton modes, originating from the lower, middle, and upper polariton branches, in a strong-coupling regime of the Z 3 and Z 1,2 excitons and cavity photon. The incidence-angle dependence of the cavity-polariton modes was analyzed using a phenomenological Hamiltonian for the strong coupling. It was found that the interaction energies of the cavity-polariton modes, the so-called vacuum Rabi splitting energies, are systematically controlled from 22(37) to 71(124) meV for the Z 3 (Z 1,2 ) exciton by changing the active layer thickness from λ/32 to λ/4. The active-layer-thickness dependence of the Rabi splitting energy is quantitatively explained by a simple theory for quantum-well microcavities.

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Section: Resultsmentioning

confidence: 98%

Control of exciton-photon interactions in CuCl microcavities

et al. 2011

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“…The energies of the transverse F4 states have already been summarized in Table 5. The dipole forbidden T2 state in CuCl has been identified by Nikitine et al [79] with an emission line observed a t Results for the parameters of spin-orbit splitting and exchange splitting derived from this experiment [50] are summarized in Tables 7 and 8. Similar results, also included in Table 8 The longitudinal states may be excited easily by two-photon absorption experiments.…”

Section: Experimental Investigations Of the Edge Excitonsmentioning

confidence: 95%

“…One finds, indeed, relevant differences in e.g. the values for oscillator strengths [47, 481 and linewidths [49,50] of Z,, or 2, between data obtained from absorption or reflectivity measurements. The reasons for these discrepancies are not yet clear a t present.…”

Section: Experimental Investigations Of the Edge Excitonsmentioning

confidence: 96%

“…At this point no crossing occurs (as to be expected for A = A = 0 ) ) but one observes a finite a -+ A , as predicted by (12) and (13). This T a b l e 7 Parameters of exchange interactions (in meV) for y-phase CuCl and CuBr derived from excitonic absorption in CuBr,Cli-, [48], magnetoreflection [50], electroreflection [46], reflection under uniaxial stress [75], and Faraday rotation [74] Table 8. experiment yielded one of the first experimental evidences (besides the deviation of the Z, , : Z, intensity ratio from 2: 1) for the existence of the electron-hole exchange interaction.…”

Section: Experimental Investigations Of the Edge Excitonsmentioning

confidence: 99%

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Band Structure and Optical Properties of Tetrahedrally Coordinated Cu‐ and Ag‐Halides

Goldmann

1977

Physica Status Solidi (b)

203

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With the exception of the edge excitions, which have been investigated since more than 40 years [5], there has been for about three decades only very limited experimental information about the valence states of the Cu-and Ag-halides. It was only very recently that photoemission experiments [6 to 121 allowed to get definite conclusions about the position of the d-levels, and to derive approximate partial p and d densities of states curves in the valence band region IS].At this state of knowledge it seems to be useful to review in the present paper all experimental and theoretical investigations of the valence and conduction band states in CuC1, CuBr, CuI, and AgI and to check the many single information on their consistency within one unifying interpretation. I n many cases details, concerning mainly the energtic position of structures, have been determined from the published spectra for this purpose. We show that for the first time a semiempirical band structure model can be given, which interprets all available data within the limits of their experimental or methodical errors.After a short discussion of the crystallization properties of the compounds studied (Section 1.2), the relevant symmetry properties and model band structures are presented in Section 2.1. Section 2.2 gives a survey of the available numerical band structure calculations. The experimental investigations of the edge excitonic states and their theoretical interpretation are discussed in Section 2.3. The more deeper lying valence and the more higher lying conduction band states are treated in Section 2.4. The semiempirical band model, obtained from combination of photoelectron data with results of X-ray emission, X-ray absorption, and ultraviolet absorption experiments is presented in Section 2.5.Not included systematically in the present article are investigations of more complex properties as, e.g. nonlinear optical susceptibilities, piezooptical and electrooptical coefficients, biexciton production and annihilation [ 131, and Raman scattering. Papers from these fields have been considered only in very few cases where they yielded additional information on the band structures discussed here. Crystal structures and phase transitionsThe elements of group IV, bound purely covalent, crystallize in the diamond structure (space group 0;). The binary 111-V and 11-VI compounds, which mostly have the zincblende lattice (Ti) or the wurtzite lattice (C&) under normal conditions, exhibit increasing values of the Phillips ionicity ft [la] with increasing distance within the periodic table and the I-VII compounds are found a t the strongly ionic end of the series of tetrahedrally coordinated crystals. Values of f i for the Cu-and Ag-halides are as follows: CuI (ft = 0.692), CuBr (0.735), CuCl (0.746), CuF (0.766), AgI (0.770), AgBr (0.850), AgCl (0.856), and AgF (0.894). Thus, whereas the Cu-halides and AgI still form the zincblende or the wurtzite lattice, in AgBr, AgC1, and AgF the ionicity is already so large that the rocksalt structure (0:) is favoured ...

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“…In the usual approximation, the Frohlich interaction is diagonal with respect t o the different valence and conduction bands and interseries scattering from Z1,2 t o Z, therefore impossible. The Z,-and Zl,2-exciton series are however mixed due to exchange interaction [17] and nondiagonal terms of the effective hole mass [ 181. Besides this, the Frohlich interaction contains in addition nondiagonal parts which allow interseries scattering of excitons [ 191.…”

Section: Discussionmentioning

confidence: 99%

Investigations on the Temperature‐Dependent TPA Linewidth of the Z₃‐Exciton in CuCl

Kalm

Uihlein

1978

Physica Status Solidi (b)

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which is approximately 0.14 meV below 10 K, increases rapidly for temperatures above 60 K (14 meV a t 185 K). The steep increase is correlated with the number of thermally excited LO phonons. The temperature-dependent halfwidth, which can be fitted by a, Bose function with the energy of the LO phonon mode (26.3 meV), is found to be proportional to the LO phonon density. From this it is concluded that the lifetime of the Z,-exciton is mainly determined by an intraband scattering process caused by the absorption of a longitudinal optical phonon.Die Zweiphotonen-Absorptionslinie des longitudinalen Z,( 1s)-Exzitons in CuCl wird im Ternperaturbereich zwischen 4,6 und 185 K untersucht. In dem angegebenen Temperaturintervall besitzt das longitudinale Exziton eine lorentzartige Linienform. Die Halbwertsbreite der schmalen Absorptionslinie, die unterhalb 40 K ungefilhr 0,14 meV betriigt, steigt fiir Temperaturen oberhalb 60 K rasch an. Der steile Anstieg ist mit der Anzahl thermisch angeregter LO-Phononen korreliert. Die temperaturabhiingige Halbwertsbreite, an die eine Bosefunktion mit der Energie des LOPhonons (26,3 meV) angepallt werden kann, ist der Dichte der LO-Phononen proportional. Aus dieser Tatsache wird geschlossen, dilB die Lebensdauer des Z,-Exzitons uberwiegend durch einen Intraband-Streuproze13 bestimmt ist, der durch die Absorption eines longitudinalen optischen Phonons hervorgerufen wird.

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Magneto‐Reflectivity Measurements on Exciton Bands in CuCl

Cited by 69 publications

References 20 publications

Control of exciton-photon interactions in CuCl microcavities

Control of exciton-photon interactions in CuCl microcavities

Band Structure and Optical Properties of Tetrahedrally Coordinated Cu‐ and Ag‐Halides

Investigations on the Temperature‐Dependent TPA Linewidth of the Z₃‐Exciton in CuCl

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Magneto‐Reflectivity Measurements on Exciton Bands in CuCl

Cited by 69 publications

References 20 publications

Control of exciton-photon interactions in CuCl microcavities

Control of exciton-photon interactions in CuCl microcavities

Band Structure and Optical Properties of Tetrahedrally Coordinated Cu‐ and Ag‐Halides

Investigations on the Temperature‐Dependent TPA Linewidth of the Z3‐Exciton in CuCl

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Investigations on the Temperature‐Dependent TPA Linewidth of the Z₃‐Exciton in CuCl