Magnetooptical properties of IV–VI compounds

Bauer, G.

doi:10.1007/3-540-10261-2_56

Cited by 28 publications

(28 citation statements)

References 57 publications

(2 reference statements)

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“…2 and 3) nor on the other explored samples. This conclusion agrees with a relatively low anisotropy of the electronic bands at the L point in PbSe (expressed, e.g., in terms of the anisotropic effective masses [16,19]), which further decreases upon incorporation of tin [23]. This is in contrast to some other lead-salt compounds, such as PbSnTe, in which the anisotropy is profound [29,42], thus giving rise to well-resolved splitting of interband inter-LL resonances due to oblique and longitudinal valleys.…”

Section: Magneto-optical Response Of Bulk States-discussionsupporting

confidence: 79%

“…[9][10][11][12][13][14] or the reviews [15,16]), and they were often motivated by potential applications in thermoelectrometry and optoelectronics-in particular, by a possibility to use this material as an active medium in infrared lasers. THz/infrared magnetospectroscopy played an important role in these pioneering studies by providing us with useful insights into the electronic band structure [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Landau level spectroscopy of the PbSnSe topological crystalline insulator

et al. 2021

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We report on an infrared magnetospectroscopy study of Pb 1−x Sn x Se, a topological crystalline insulator. We have examined a set of samples, all in the inverted regime of electronic bands, with the tin composition varying from x = 0.2 to 0.33. Our analysis shows that the observed response, composed of a series of interband inter-Landau-level excitations, can be interpreted and modeled using the relativistic-like Hamiltonian for threedimensional massive Dirac electrons, expanded to include diagonal quadratic terms that impose band inversion. In our data, we have not found any clear signature of massless electron states that are present on the surface of Pb 1−x Sn x Se crystals in the inverted regime. Reasons for this unexpected result are discussed.

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Section: Magneto-optical Response Of Bulk States-discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Landau level spectroscopy of the PbSnSe topological crystalline insulator

et al. 2021

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“…1b). 28,29,[41][42][43] The bulk Fermi surface of Pb 1-x Sn x Se and Pb 1-x Sn x Te is shown in Fig. 1b.…”

Section: Resultsmentioning

confidence: 99%

“…It can actually be shown that a description similar to that of BHZ can be applied to describe the band structure of Pb 1-x Sn x Se and Pb 1-x Sn x Te. Starting from a 2-band k.p Hamiltonian where Δ is defined to be the half-band-gap again, and v c = (P k.p )/(m 0 ) where P k.p is the k.p matrix element of each respective valley, 43 we can then perturbatively introduce contributions from far-bands as…”

Section: Resultsmentioning

confidence: 99%

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Magnetooptical determination of a topological index

et al. 2017

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When a Dirac fermion system acquires an energy-gap, it is said to have either trivial (positive energy-gap) or non-trivial (negative energy-gap) topology, depending on the parity ordering of its conduction and valence bands. The non-trivial regime is identified by the presence of topological surface or edge-states dispersing in the energy gap of the bulk and is attributed a non-zero topological index. In this work, we show that such topological indices can be determined experimentally via an accurate measurement of the effective velocity of bulk massive Dirac fermions. We demonstrate this approach analytically starting from the Bernevig-HughesZhang Hamiltonian to show how the topological index depends on this velocity. We then experimentally extract the topological index in Pb 1-x Sn x Se and Pb 1-x Sn x Te using infrared magnetooptical Landau level spectroscopy. This approach is argued to be universal to all material classes that can be described by a Bernevig-Hughes-Zhang-like model and that host a topological phase transition.npj Quantum Materials (2017) 2:26 ; doi:10.1038/s41535-017-0028-5 INTRODUCTIONThe concept of band topology in condensed matter systems has revolutionized our understanding of quantum phases of matter.

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Thermoelectric figure of merit of the system (GeTe)1−x(AgSbTe2)x

Placheova¹

1984

Phys. Stat. Sol. (a)

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The thermoelectric properties of polycrystalline samples of GeTe-rich side solid solutions (GeTe)l -, .. (AgSbTe,), for the compositions z = 0.00, 0.10, 0.15, 0.20, and 0.29 are investigated. The temperature dependences of the Seebeck coefficient and the electrical resistivity and the dependences of the total thermal conductivity a t 300 K versus composition are measured. The temperature dependences of the total thermal conductivity and the thermoelectric figure of merit 2 are calculated. The composition with maximum value of 2 is determined as GeTe + 20 mol% AgSbTe,.The reasons for the maximum thermoelectric figure of merit for this composition and for the anomaly changes in the thermoelectric parameters and the sharp increase of 2 in the region of phase transitions (Oi-C&,)are discussed.Die thermoelektrischen Eigenschaften von polykristallinen Proben der Mischkristalle (GeTe)l -, * . (AgSbTe,), nahe der Verbindung GeTe mit den Zusammensetzungen z = 0,OO; 0,lO; 0,15; 0,20 und 0,29 werden untersucht. Die Temperaturabhangigkeiten der Thermospannung und des spezifischen elektrischen Widerstandes und die Abhiingigkeiten der thermischen Leitfiihigkeit bei 300 K von der Zusammensetzung werden gemessen. Die Temperaturabhingigkeiten der thermischen Leitfiihigkeit und des thermischen Wirkungsgrades 2 werden berechnet. Die Zusammensetzung mit dem Maximalwert von 2 wird bestimmt zu GeTe + 20 Molyo AgSbTe,. Die Ursachen fur den maximalen Wirkungsgrad bei dieser Zusammensetzung und fur das scharfe Anwachsen von 2 im Gebiet der Phesenumwandlung (Oi-Civ) fur alle Zusammensetzungen werden diskutiert.

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Magnetooptical properties of IV–VI compounds

Cited by 28 publications

References 57 publications

Landau level spectroscopy of the PbSnSe topological crystalline insulator

Landau level spectroscopy of the PbSnSe topological crystalline insulator

Magnetooptical determination of a topological index

Thermoelectric figure of merit of the system (GeTe)1−x(AgSbTe2)x

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