Quinn Gibson
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View article: Evidence of a Bulk Interlayer Excitonic Insulator Phase in the Oxypnictide CeMnAsO1-xFx
Evidence of a Bulk Interlayer Excitonic Insulator Phase in the Oxypnictide CeMnAsO1-xFx Open
Excitonic insulators are a remarkable class of insulators that can exhibit a condensate of electron-hole pairs below a critical temperature TC and are predicted to give rise to exotic quantum phenomena. Thus far, the excitonic i…
View article: Tuning the band gap and structure from wide gap SrBi<sub>3</sub>O<sub>4</sub>Cl<sub>3</sub> to narrow gap Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> by aliovalent anion substitution
Tuning the band gap and structure from wide gap SrBi<sub>3</sub>O<sub>4</sub>Cl<sub>3</sub> to narrow gap Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> by aliovalent anion substitution Open
Aliovalent substitution can generates a complex solid solution between SrBi 3 O 4 Cl 3 and Bi 4 O 4 SeCl 2 with very different band gaps, leading to a nearly isolated Se p band and two distinct band-gap like onset energies in intermediate …
View article: Tuning the band gap and structure from wide gap SrBi3O4Cl3 to narrow gap Bi4O4SeCl2 by aliovalent anion substitution
Tuning the band gap and structure from wide gap SrBi3O4Cl3 to narrow gap Bi4O4SeCl2 by aliovalent anion substitution Open
Modifying the atomic and electronic structure of materials by chemical substitution is a common method of achieving properties by design. Cations and metal atoms are the most frequent choices for chemical substitution; replacing anions wit…
View article: Control of Polarity in Kagome‐NiAs Bismuthides
Control of Polarity in Kagome‐NiAs Bismuthides Open
A 2×2×1 superstructure of the P 6 3 / mmc NiAs structure is reported in which kagome nets are stabilized in the octahedral transition metal layers of the compounds Ni 0.7 Pd 0.2 Bi, Ni 0.6 Pt 0.4 Bi, and Mn 0.99 Pd 0.01 Bi. The ordered vac…
View article: Control of Polarity in Kagome‐NiAs Bismuthides
Control of Polarity in Kagome‐NiAs Bismuthides Open
A 2×2×1 superstructure of the P 6 3 / mmc NiAs structure is reported in which kagome nets are stabilized in the octahedral transition metal layers of the compounds Ni 0.7 Pd 0.2 Bi, Ni 0.6 Pt 0.4 Bi, and Mn 0.99 Pd 0.01 Bi. The ordered vac…
View article: CSD 2246936: Experimental Crystal Structure Determination
CSD 2246936: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Magnetic, electronic, and thermal properties of buckled kagome <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Sb</mml:mi></mml:mrow></mml:math>
Magnetic, electronic, and thermal properties of buckled kagome Open
The authors would like to acknowledge funding from the Engineering and Physical Sciences Research Council (EPSRC) Programme Grants (No. EP/N004884 and No. EP/V026887).
View article: Low thermal conductivity in Bi<sub>8</sub>CsO<sub>8</sub>SeX<sub>7</sub> (X = Cl, Br) by combining different structural motifs
Low thermal conductivity in Bi<sub>8</sub>CsO<sub>8</sub>SeX<sub>7</sub> (X = Cl, Br) by combining different structural motifs Open
By combining different structural features to scatter phonons Bi 8 CsO 8 SeX 7 (X = Cl, Br) exhibits ultra-low thermal conductivities of ∼0.22 W m −1 K −1 at room temperature.
View article: CSD 1989783: Experimental Crystal Structure Determination
CSD 1989783: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Band Structure Engineering of Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> for Thermoelectric Applications
Band Structure Engineering of Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> for Thermoelectric Applications Open
The mixed anion material Bi4O4SeCl2 has an ultralow thermal conductivity of 0.1 W m-1 K-1 along its stacking axis (c axis) at room temperature, which makes it an ideal candidate…
View article: Expanding multiple anion superlattice chemistry: Synthesis, structure and properties of Bi4O4SeBr2 and Bi6O6Se2Cl2
Expanding multiple anion superlattice chemistry: Synthesis, structure and properties of Bi4O4SeBr2 and Bi6O6Se2Cl2 Open
The synthesis, structure, and properties of the three-anion superlattice materials Bi4O4SeBr2 and Bi6O6Se2Cl2 are reported. These materials crystallise in structures that form part of a homologous series of compounds comprised of stackings…
View article: Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch
Low thermal conductivity in a modular inorganic material with bonding anisotropy and mismatch Open
Blocking heat in two ways Low thermal conductivity is important for barrier coatings, thermoelectrics, and other applications. Gibson et al . combined two complementary methods that manipulate internal interface properties to dramatically …
View article: Discovery of a Low Thermal Conductivity Oxide Guided by Probe Structure Prediction and Machine Learning
Discovery of a Low Thermal Conductivity Oxide Guided by Probe Structure Prediction and Machine Learning Open
We report the aperiodic titanate Ba 10 Y 6 Ti 4 O 27 with a room‐temperature thermal conductivity that equals the lowest reported for an oxide. The structure is characterised by discontinuous occupancy modulation of each of the sites and c…
View article: Discovery of a Low Thermal Conductivity Oxide Guided by Probe Structure Prediction and Machine Learning
Discovery of a Low Thermal Conductivity Oxide Guided by Probe Structure Prediction and Machine Learning Open
We report the aperiodic titanate Ba 10 Y 6 Ti 4 O 27 with a room‐temperature thermal conductivity that equals the lowest reported for an oxide. The structure is characterised by discontinuous occupancy modulation of each of the sites and c…
View article: CSD 2080722: Experimental Crystal Structure Determination
CSD 2080722: Experimental Crystal Structure Determination Open
View article: One Site, Two Cations, Three Environments: s<sup>2</sup> and s<sup>0</sup> Electronic Configurations Generate Pb-Free Relaxor Behavior in a Perovskite Oxide
One Site, Two Cations, Three Environments: s<sup>2</sup> and s<sup>0</sup> Electronic Configurations Generate Pb-Free Relaxor Behavior in a Perovskite Oxide Open
The piezoelectric devices widespread in society use noncentrosymmetric Pb-based oxides because of their outstanding functional properties. The highest figures of merit reported are for perovskites based on the parent Pb(Mg1/3Nb<…
View article: Prediction of higher thermoelectric performance in BiOCuSe by weakening electron-polar optical phonon scattering
Prediction of higher thermoelectric performance in BiOCuSe by weakening electron-polar optical phonon scattering Open
BiOCuSe is a promising thermoelectric material, but its applications are hindered by low carrier mobility. We use first principles calculations to analyse electron-phonon scattering mechanisms and evaluate their contributions to the thermo…
View article: A Giant Bulk‐Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe
A Giant Bulk‐Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe Open
Half-metals are a class of materials that are metallic only for one spin direction, and are essential for spintronics applications where one needs to read, write, store and transfer spin-data. This spin sensitivity appears to restrict them…
View article: A Giant Bulk‐Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe
A Giant Bulk‐Type Dresselhaus Splitting with 3D Chiral Spin Texture in IrBiSe Open
Materials with giant spin splitting are desired for spintronic applications. The fabrications of spintronic devices from half metals with one spin direction are often hampered, however, by stray magnetic fields, domain walls, short spin co…
View article: CSD 1977978: Experimental Crystal Structure Determination
CSD 1977978: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Anion compositional diversity reduces bonding dimensionality in the van der Waals semiconductor Bi4O4SeCl2
Anion compositional diversity reduces bonding dimensionality in the van der Waals semiconductor Bi4O4SeCl2 Open
Making new van der Waals materials with electronic or magnetic functionality is a chemical design challenge for the development of two-dimensional nanoelectronic and energy conversion devices. We present the synthesis and properties of the…
View article: Prediction of higher thermoelectric performance in BiCuSeO by weakening electron–polar optical phonon scattering
Prediction of higher thermoelectric performance in BiCuSeO by weakening electron–polar optical phonon scattering Open
Targeting electron–polar optical (PO) phonon scattering for higher thermoelectric performance in BiCuSeO.
View article: Modular Design via Multiple Anion Chemistry of the High Mobility van der Waals Semiconductor Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub>
Modular Design via Multiple Anion Chemistry of the High Mobility van der Waals Semiconductor Bi<sub>4</sub>O<sub>4</sub>SeCl<sub>2</sub> Open
Making new van der Waals materials with electronic or magnetic functionality is a chemical design challenge for the development of two-dimensional nanoelectronic and energy conversion devices. We present the synthesis and properties of the…
View article: Time-reversal symmetry breaking type-II Weyl state in YbMnBi2
Time-reversal symmetry breaking type-II Weyl state in YbMnBi2 Open
View article: Observation of the nonlinear Hall effect under time-reversal-symmetric conditions
Observation of the nonlinear Hall effect under time-reversal-symmetric conditions Open
View article: Electrically tunable low-density superconductivity in a monolayer topological insulator
Electrically tunable low-density superconductivity in a monolayer topological insulator Open
A monolayer of many talents Superconductors with a topologically nontrivial band structure have been predicted to exhibit exotic properties. However, such materials are few and far between. Now, two groups show that the monolayer of the ma…
View article: Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2
Electrically switchable Berry curvature dipole in the monolayer topological insulator WTe2 Open
View article: Stable Hydrogen Evolution from an AgRhO<sub>2</sub> Photocathode under Visible Light
Stable Hydrogen Evolution from an AgRhO<sub>2</sub> Photocathode under Visible Light Open
In the search for improved materials for photoelectrochemical water splitting, it has become important to identify new classes of semiconductor materials that may serve as improved photocathodes. To this end, p-type AgRhO2 has b…
View article: Nonuniform carrier density in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Cd</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>As</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math> evidenced by optical spectroscopy
Nonuniform carrier density in evidenced by optical spectroscopy Open
We report the detailed optical properties of Cd$_3$As$_2$ crystals in a wide\nparameter space: temperature, magnetic field, carrier concentration and crystal\norientation. We investigate high-quality crystals synthesized by three\ndifferen…
View article: Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>WTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate Open
We present a time- and angular-resolved photoemission (TR-ARPES) study of the transition- metal dichalcogenide WTe2, a candidate type II Weyl semimetal exhibiting extremely large magne- toresistence. Using femtosecond light pulses, we char…