Two-dimensional magnetopolaron coupling to both homopolar and longitudinal optic phonons in the layer compound InSe

Howell, D. F.; Nicholas, R.J.; Langerak, C.J.G.M.; Singleton, John; Janssen, T. J. B. M.; Chévy, A.

doi:10.1088/0953-8984/1/40/024

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…The A 2 (LO) and E 2 (LO) modes at 198 and 207 cm −1 , forbidden by selection rules, 26 show strong intensities due to resonance with the exciton energy of InSe. 27,28 Matching well with our theoretical phonon calculations in Figure 1b, two single-phonon modes of A 1 1 and A 1 2 modes are observed in the Raman spectrum. Their phonon vibrations are attributed to the out-of-plane vibration of the In and Se atoms in two different configurations.…”

Section: ■ Results and Discussionsupporting

confidence: 88%

“…As seen in Figure b, the room-temperature unpolarized Raman spectra excited by linearly polarized 514 nm laser shows five Raman peaks at 114, 177, 198, 207, and 225 cm –1 , which can be assigned to the 3R-InSe Raman modes of A 1 1 , E 1 , A 2 (LO), E 2 (LO), and A 1 2 , respectively. , The schematic representations of atom displacements in these phonons modes are displayed in Figure S3. The A 2 (LO) and E 2 (LO) modes at 198 and 207 cm –1 , forbidden by selection rules, show strong intensities due to resonance with the exciton energy of InSe. , Matching well with our theoretical phonon calculations in Figure b, two single-phonon modes of A 1 1 and A 1 2 modes are observed in the Raman spectrum. Their phonon vibrations are attributed to the out-of-plane vibration of the In and Se atoms in two different configurations.…”

Section: Resultssupporting

confidence: 87%

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An Anomalous Magneto-Optic Effect in Epitaxial Indium Selenide Layers

Zhao

Wang

et al. 2020

Nano Lett.

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Single-phonon modes offer potential applications in quantum phonon optics, but the phonon density of states of most materials consist of mixed contributions from coupled phonons. Here, using theoretical calculations and magneto-Raman measurements, we report two single-phonon vibration modes originating from the breathing and opposite out-of-plane vibrations of InSe layers. These single-phonon vibrations exhibit an anticorrelated scattering rotations of the polarization axis under an applied vertical magnetic field; such an anomalous magneto-optical behavior is due to the reverse bond polarizations of two quantum atomic vibrations, which induce different symmetry for the corresponding Raman selection rules. A 180° (+90° and −90°) integrated scattering rotation angle of two single-phonon modes was achieved when the magnetic field was swept from 0 to 6 T. This work demonstrates new ways to manipulate the magneto-optic effect through phonon polarity-based symmetry control and opens avenues for exploring single-phonon-vibration-based nanomechanical oscillators and magneto-phonon-coupled physics.

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Section: ■ Results and Discussionsupporting

confidence: 88%

Section: Resultssupporting

confidence: 87%

An Anomalous Magneto-Optic Effect in Epitaxial Indium Selenide Layers

Zhao

Wang

et al. 2020

Nano Lett.

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“…The presence of 2D electrons in InSe and the role that they play in transport properties has been widely investigated [27]- [32]. The origin of 2D electrons in InSe is extrinsic.…”

Section: D Electronsmentioning

confidence: 99%

“…The 2D states are electric subbands that have been atributed to quantum size effects in thin layers limited by stacking fault related barriers [13]. Other authors have proposed a model in which 2D electronic subbands in InSe are created by a high concentration of donor impurities bound to a stacking fault, like in δ-doping systems [32]. This model is inconsistent with the low areal concentration and high 2D electron mobility in InSe at low temperature.…”

Section: D Electronsmentioning

confidence: 99%

Investigation of conduction-band structure, electron-scattering mechanisms, and phase transitions in indium selenide by means of transport measurements under pressure

et al. 1997

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In this work we report on Hall-effect, resistivity, and thermopower measurements in n-type indium selenide at room temperature under either hydrostatic or quasihydrostatic pressure. Up to 40 kbar (ϭ4 GPa͒, the decrease of carrier concentration as the pressure increases is explained through the existence of a subsidiary minimum in the conduction band. This minimum shifts towards lower energies under pressure, with a pressure coefficient of about Ϫ98 meV/GPa, and its related impurity level traps electrons as it reaches the band gap and approaches the Fermi level. The pressure value at which the electron trapping starts is shown to depend on the electron concentration at ambient pressure and the dimensionality of the electron gas. At low pressures the electron mobility increases under pressure for both three-and two-dimensional electrons, the increase rate being higher for two-dimensional electrons, which is shown to be coherent with previous scattering mechanisms models. The phase transition from the semiconductor layered phase to the metallic sodium chloride phase is observed as a drop in resistivity around 105 kbar, but above 40 kbar a sharp nonreversible increase of the carrier concentration is observed, which is attributed to the formation of donor defects as precursors of the phase transition.

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“…Consequently, it was considered [2] that in n-type material, during the growth of the crystal, the shallow donor impurities are accumulated at the defect planes leading to the formation of several sheets with a low individual estimated electron density (of order 1 × 10 11 cm −2 ). Subsequent cyclotron studies [3,4] have confirmed the proposed electron gas model. An improvement [5] of this model was done by considering a quasi-twodimensional (Q2D) behaviour of the electron gas.…”

Section: Introductionmentioning

confidence: 66%

Complex magneto-polaron spectrum of the layer compound InSe

Brancus¹,

Stan²,

Dafinei³

2005

J. Phys.: Condens. Matter

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We analyse the energy magneto-polaron spectrum of the polar uniaxial layer compound InSe in a magnetic field directed along the optical axis. A quasibidimensional behaviour of the electron gas in this particular structure was considered. In the framework of the Wigner-Brillouin perturbational theory we systematically take into account all the sources of anisotropy. We found that the implied anisotropy brings distinctive contributions to the complex energy magneto-polaron spectrum of polar uniaxial crystals. The theory is used to examine the experimental results obtained from cyclotron resonance frequency measurements in InSe at low temperature.

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Two-dimensional magnetopolaron coupling to both homopolar and longitudinal optic phonons in the layer compound InSe

Cited by 11 publications

References 27 publications

An Anomalous Magneto-Optic Effect in Epitaxial Indium Selenide Layers

An Anomalous Magneto-Optic Effect in Epitaxial Indium Selenide Layers

Investigation of conduction-band structure, electron-scattering mechanisms, and phase transitions in indium selenide by means of transport measurements under pressure

Complex magneto-polaron spectrum of the layer compound InSe

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