Bouncing cosmology in 
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 gravity

Singh, J. K.; Bamba, Kazuharu; Nagpal, Ritika; Pacif, S. K. J.

doi:10.1103/physrevd.97.123536

Cited by 100 publications

(66 citation statements)

References 77 publications

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“…The electronic structure of solid molecular hydrogen have mainly been investigated by means of density-functional theory (DFT)-based methods, [16][17][18][19][20][21][22][23][24][25] as well as using the quasiparticle (QP) approach. [15,26] Although DFT-based methods are usually able to describe the crystal structures and relative total energies of the relevant phases, their insufficiencies are more apparent in the case of band-gap calculations.…”

Section: Introductionmentioning

confidence: 99%

Nuclear quantum effects induce metallization of dense solid molecular hydrogen

2017

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We present an accurate computational study of the electronic structure and lattice dynamics of solid molecular hydrogen at high pressure. The band-gap energies of the C2/c, Pc, and P63/m structures at pressures of 250, 300, and 350 GPa are calculated using the diffusion quantum Monte Carlo (DMC) method. The atomic configurations are obtained from ab initio path-integral molecular dynamics (PIMD) simulations at 300 K and 300 GPa to investigate the impact of zero-point energy and temperature-induced motion of the protons including anharmonic effects. We find that finite temperature and nuclear quantum effects reduce the band-gaps substantially, leading to metallization of the C2/c and Pc phases via band overlap; the effect on the band-gap of the P63/m structure is less pronounced. Our combined DMC-PIMD simulations predict that there are no excitonic or quasiparticle energy gaps for the C2/c and Pc phases at 300 GPa and 300 K. Our results also indicate a strong correlation between the band-gap energy and vibron modes. This strong coupling induces a band-gap reduction of more than 2.46 eV in high-pressure solid molecular hydrogen. Comparing our DMC-PIMD with experimental results available, we conclude that none of the structures proposed is a good candidate for phases III and IV of solid hydrogen. © 2017 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 99%

Nuclear quantum effects induce metallization of dense solid molecular hydrogen

2017

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“…a. Zero-field muon spin relaxation Firstly, time-reversal symmetry breaking was investigated by ZF-µSR, as has been seen in other NCS superconductors [11,[28][29][30][31][32]. In superconductors with broken TRS, either the spin or orbital parts of the Cooper pairs are non-zero, which results in the appearance of the small magnetic field below the transition temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Noncentrosymmetric superconductors have been recognized as good candidates to search for broken TRS. To date, TRS breaking have been found in NCS superconductors, such as LaNiC 2 [11], Re 6 X (X * rpsingh@iiserb.ac.in = Ti,Zr,Hf) [28][29][30], locally noncentrosymmetric SrPtAs [31] and La 7 Ir 3 [32]. This number is very small, if compared to the extent of NCS superconductors studied so far [33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

“…The intermetallic Re 6 X-NCS superconductors are of particular interest since most of the members in this family have been found to exhibit TRS breaking in the superconducting state [28][29][30]. Interestingly, when studied using the muon spin rotation/relaxation (µSR) technique, the TRS-breaking effects seems very similar in all the Re 6 X binary alloys.…”

Section: Introductionmentioning

confidence: 99%

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Nodeless s-wave superconductivity in the $\alpha$ -Mn structure type noncentrosymmetric superconductor TaOs: a $\mu$ SR study

Singh¹,

P²,

Marik³

et al. 2019

J. Phys.: Condens. Matter

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Noncentrosymmetric superconductors can lead to a variety of exotic properties in the superconducting state such as line nodes, multigap behavior, and time-reversal symmetry breaking. In this paper, we report the properties of the new noncentrosymmetric superconductor TaOs, using muon spin relaxation and rotation measurements. It is shown using the zero-field muon experiment that TaOs preserve the time-reversal symmetry in the superconducting state. From the transverse field muon measurements, we extract the temperature dependence of λ(T ) which is proportional to the superfluid density. This data can be fit with a fully gapped s-wave model for α = ∆(0)/kBTc = 2.01 ± 0.02. Furthermore, the value of magnetic penetration depth is found to be 5919 ± 45 Å, which is consistent with the value obtained from the bulk measurements.

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“…It has been reported that biaxial strain could suppress indium phase separation in InGaN/GaN double heterojunction structure and thus provides an important channel to improve the quality of InGaN film with high In composition. [13][14] The strategy of InGaN/GaN multiple quantum well (MQW) embedded within the intrinsic region of conventional p-i-n structure was proposed and played a positive role for InGaN SCs. Sheu et al showed that InGaN/GaN superlattice structure had obvious advantages over single thick film of InGaN, [15] which was further proven by Cavassilas et al in theory.…”

Section: Introductionmentioning

confidence: 99%

Study of InGaN/GaN Multiple Quantum Well Solar Cells With Different Barrier Thicknesses

Cai

Huang

Wang

et al. 2017

Physica Status Solidi (a)

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InGaN/GaN multiple quantum well solar cells (MQW‐SCs) with different barrier thicknesses are investigated. By comparing both the material property and device performance, it is demonstrated within our study that thinner barrier thickness in MQW‐SCs favors the transport of photogenerated carriers, but may be also accompanied by larger leakage current. An optimal trade‐off depends on the suitable barrier thickness. In addition, it also indicates that inadequate p‐type doping and unique polarization field have detrimental effects on carrier collection.

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Bouncing cosmology in f(R,T) gravity

Cited by 100 publications

References 77 publications

Nuclear quantum effects induce metallization of dense solid molecular hydrogen

Nuclear quantum effects induce metallization of dense solid molecular hydrogen

Nodeless s-wave superconductivity in the $\alpha$ -Mn structure type noncentrosymmetric superconductor TaOs: a $\mu$ SR study

Study of InGaN/GaN Multiple Quantum Well Solar Cells With Different Barrier Thicknesses

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