Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Pb</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Sn</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:mi>Te</mml:mi></mml:mrow></mml:math>

Cheng, Bing; Taylor, Patrick J.; Folkes, P. A.; Rong, Charles; Armitage, N. P.

doi:10.1103/physrevlett.122.097401

Cited by 25 publications

(22 citation statements)

References 35 publications

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“…At B=0 the Drude conductivity peak appears as a single Lorentzian oscillator centered at zero frequency with width Γ. Applied fields B simply shift the Drude peak from zero to ω c , as depicted [32,34]. However, if Γ also increases with B, then σ 1 and σ 2 are additionally broadened and reduced in amplitude as shown in Figs.…”

mentioning

confidence: 87%

“…2, from which we can extract T xy and T xx , and reconstruct the complex conductivity σ r,l (ω) from the right-and left-circular complex transmission T r,l = T xx ± iT xy as described in Ref. [32]. Note that the ability to reconstruct the complex T r,l in a broadband fashion is a capability unique to TDTS and is, as shown below, essential to extracting ω c in this material.…”

mentioning

confidence: 98%

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Observation of cyclotron resonance and measurement of the hole mass in optimally-doped La$_{2-x}$Sr$_{x}$CuO$_4$

Post,

Legros,

Rickel

et al. 2020

Preprint

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Using time-domain terahertz spectroscopy in pulsed magnetic fields up to 31 T, we measure the terahertz optical conductivity in an optimally-doped thin film of the high temperature superconducting cuprate La1.84Sr0.16CuO4. We observe systematic changes in the circularly-polarized complex optical conductivity that are consistent with cyclotron absorption of p-type charge carriers characterized by a cyclotron mass of 4.9 ± 0.8 me, and a scattering rate that increases with magnetic field. These results open the door to studies aimed at characterizing the degree to which electron-electron interactions influence carrier masses in cuprate superconductors.

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mentioning

confidence: 87%

mentioning

confidence: 98%

Observation of cyclotron resonance and measurement of the hole mass in optimally-doped La$_{2-x}$Sr$_{x}$CuO$_4$

Post,

Legros,

Rickel

et al. 2020

Preprint

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“…Even though the power of this technique is readily apparent in the measurement of polarization-dependent phenomena in condensed matter, it lacks direct sensitivity to the circular polarization state of an incoming THz wave. There are examples, however, when it is possible to extract the circular polarization response from the linear ones [20][21][22] . In some circumstances the sample may have a more physically relevant response to electromagnetic radiation that is circularly polarized.…”

Section: Circular Polarization and Jones Matricesmentioning

confidence: 99%

Broadband circular polarization time-domain terahertz spectroscopy

Jasper

Mai

Warren

et al. 2020

Phys. Rev. Materials

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Light-matter interactions are key in providing fundamental information about materials. Even in the linear-response regime, the spectroscopic response of a material encodes in it many properties of the ground state as well as of its excitations. This knowledge has been critical in our understanding of novel quantum materials, and the further improvement and extensions of linear spectroscopy will continue to be key in the exploration of novel states of matter. We report the development of broadband circular polarization spectroscopy in the terahertz range of the electromagnetic spectrum. We take advantage of a recent design of a broadband quarter wave plate, based on the Fresnel rhomb concept, and use it in conjunction with a polarization modulation technique to provide direct information of the response of a material to circularly polarized THz radiation; a new capability shown here for the first time. As an example of this technique we study the cyclotron resonance of a 2D electron gas from a AlGaAs-GaAs quantum well. We demonstrate the unique advantages that this technique will bring in the study of novel quantum materials.

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“…In the presence of magnetic fields, we measured transmittance T xx and T xy with the detection polarizer along the x and y directions, respectively, while the input polarizer was set in the x direction. The transmittance was then converted to a circular basis as T R,L = T xx ± iT xy , which was in turn converted into the conductivity in the circular basis [24]. Figure 3(a) shows the real part of the conductivity in the circular basis for 0 T (dashed lines) and 9 T (colored lines) at different temperatures.…”

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confidence: 99%

Magnetic Control of Soft Chiral Phonons in PbTe

Baydin,

Hernandez,

Rodriguez-Vega

et al. 2021

Preprint

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PbTe crystals have a soft transverse optical phonon mode in the terahertz frequency range, which is known to efficiently decay into heat-carrying acoustic phonons, resulting in anomalously low thermal conductivity. Here, we studied this phonon via polarization-dependent terahertz spectroscopy. We observed softening of this mode with decreasing temperature, indicative of incipient ferroelectricity, which we explain through a model including strong anharmonicity with a quartic displacement term. In magnetic fields up to 25 T, the phonon mode split into two modes with opposite handedness, exhibiting circular dichroism. Their frequencies displayed Zeeman splitting together with an overall diamagnetic shift with increasing magnetic field. Using a group-theoretical approach, we demonstrate that these observations are results of magnetic field-induced morphic changes in the crystal symmetries through the Lorentz force exerted on the lattice ions. This study thus reveals a novel process of controlling phonon properties in a soft ionic lattice by a strong magnetic field.

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Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator Pb0.5Sn0.5Te

Cited by 25 publications

References 35 publications

Observation of cyclotron resonance and measurement of the hole mass in optimally-doped La$_{2-x}$Sr$_{x}$CuO$_4$

Observation of cyclotron resonance and measurement of the hole mass in optimally-doped La$_{2-x}$Sr$_{x}$CuO$_4$

Broadband circular polarization time-domain terahertz spectroscopy

Magnetic Control of Soft Chiral Phonons in PbTe

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