Magnetotransport in 2D semiconductor systems under pressure

Dmowski, L.; Portal, J. C.

doi:10.1088/0268-1242/4/4/002

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…This hypothesis is not unreasonable since pressure tunes all band parameters, some of which are discussed in Supplementary Note 1. The quantity changing the most dramatically with pressure is the electron density: it decreases linearly with pressure, reaching at 10 kbar nearly 20% of its value in the ambient [29,35,36]. In Fig.4 we explore the premise of other driving parameters by plotting the nematic onset temperature against pressure, electron density, and magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Electron–electron interactions and the paired-to-nematic quantum phase transition in the second Landau level

et al. 2018

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In spite of its ubiquity in strongly correlated systems, the competition of paired and nematic ground states remains poorly understood. Recently such a competition was reported in the two-dimensional electron gas at filling factor ν = 5/2. At this filling factor a pressure-induced quantum phase transition was observed from the paired fractional quantum Hall state to the quantum Hall nematic. Here we show that the pressure-induced paired-to-nematic transition also develops at ν = 7/2, demonstrating therefore this transition in both spin branches of the second orbital Landau level. However, we find that pressure is not the only parameter controlling this transition. Indeed, ground states consistent with those observed under pressure also develop in a sample measured at ambient pressure, but in which the electron–electron interaction was tuned close to its value at the quantum critical point. Our experiments suggest that electron–electron interactions play a critical role in driving the paired-to-nematic transition.

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Section: Introductionmentioning

confidence: 99%

“…At the critical pressure of the paired-to-nematic transition we find κ B,c = 1.63, nearly independent of the filling factor. Here we took into account the pressure dependence of the effective mass and dielectric constant [36]. It is tempting to think of Fig.5 as a phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Electron–electron interactions and the paired-to-nematic quantum phase transition in the second Landau level

et al. 2018

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“…A detailed discussion of the dependence on pressure of these parameters can be found in the Supplement. Decreasing density with an increasing pressure [44] has by far the strongest imprint on these values. We find that in the pressure range P = 8.26 ÷ 9.76 kbar at which the nematic phase is detected, the density ranges between n = 1.0 ÷ 0.68 × 10 11 /cm 2 , the Landau level mixing parameter spans κ = 2.08 ÷ 2.57, and the adimensional layer width spreads over w/l B = 1.51 ÷ 1.24.…”

mentioning

confidence: 99%

Observation of a transition from a topologically ordered to a spontaneously broken symmetry phase

Samkharadze¹,

Schreiber²,

Gardner³

et al. 2015

Nature Phys

112

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Until the late 1980s, phases of matter were understood in terms of Landau's symmetry breaking theory. Following the discovery of the quantum Hall effect the introduction of a second class of phases, those with topological order, was necessary. Phase transitions within the first class of phases involve a change in symmetry, whereas those between topological phases require a change in topological order. However, in rare cases transitions may occur between the two classes in which the vanishing of the topological order is accompanied by the emergence of a broken symmetry. Here, we report the existence of such a transition in the two-dimensional electron gas. When tuned by hydrostatic pressure, the ν = 5/2 fractional quantum Hall state, believed to be a prototype non-Abelian topological phase, gives way to a quantum Hall nematic phase. Remarkably, this nematic phase develops spontaneously, i.e. in the absence of any externally applied symmetry breaking fields.

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“…different PCs. 35 The pressure in the DAC is high enough to achieve Γ-X and Γ-L crossover along with Γ-Γ transition. The non-linear bandgap energy behavior above 4.3 GPa can also be attributed to non-hydrostatic effects at higher pressures connected with the extremely sophisticated doublegasket measuring technique of transmittance spectra (Supplementary Material).…”

mentioning

confidence: 99%

Pressure-dependent bandgap study of MBE grown {CdO/MgO} short period SLs using diamond anvil cell

Adhikari

Strąk

Dłuźewski

et al. 2022

Applied Physics Letters

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Semiconductor superlattices (SLs) have found widespread applications in electronic industries. In this work, a short-period SL structure composed of CdO and MgO layers was grown using a plasma-assisted molecular beam epitaxy technique. The optical property of the SLs was investigated by absorption measurement at room temperature. The ambient-pressure direct bandgap was found to be 2.76 eV. The pressure dependence of fundamental bandgap has been studied using a diamond anvil cell technique. It has been found that the band-to-band transition shifts toward higher energy with an applied pressure. The bandgap of SLs was varied from 2.76 to 2.87 eV with applied pressure varied from 0 to 5.9 GPa. The pressure coefficient for the direct bandgap of SLs was found to be 26 meV/GPa. The obtained experimental result was supported by theoretical results obtained using density functional theory calculations. The volume deformation potential was estimated using the empirical rule. We believe that our findings may provide valuable insight for a better understanding of {CdO/MgO} SLs toward their future applications in optoelectronics.

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Magnetotransport in 2D semiconductor systems under pressure

Abstract: A review is presented of pressure studies based on measurements of magnetoresistivity and Shubnikov-de Haas oscillations as well as quantum and classical Hall effects, performed on various types of 2D semiconductor systems and demonstrating a variety of effects induced by pressure.

Cited by 6 publications

References 24 publications

Electron–electron interactions and the paired-to-nematic quantum phase transition in the second Landau level

Electron–electron interactions and the paired-to-nematic quantum phase transition in the second Landau level

Observation of a transition from a topologically ordered to a spontaneously broken symmetry phase

Pressure-dependent bandgap study of MBE grown {CdO/MgO} short period SLs using diamond anvil cell

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