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#### Valley relaxation of resident electrons and holes in a monolayer semiconductor: Dependence on carrier density and the role of substrate-induced disorder

Analogous to the keen interest in electron, hole, and exciton spin relaxation during the early days of semiconductor spintronics, measurements of valley relaxation in monolayer transition-metal dichalcogenide (TMD) semiconductors such as WSe2 are currently a focus of attention for potential applications in valleytronics. For many notional valleytronic devices, the important parameter is the intrinsic valley relaxation time of the resident electrons and holes that exist in n-type and p-type TMD monolayers. Using optical methods, the authors determine these timescales as a systematic function of carrier density, and study the (important) role of the underlying substrate. Microsecond-long valley relaxation of carriers is revealed at low densities.

Jing Li et al.
Phys. Rev. Materials 5, 044001 (2021)

#### Control of the metal-insulator transition in ${\mathrm{NdNiO}}_{3}$ thin films through the interplay between structural and electronic properties

The metal-insulator transition in NdNiO${}_{3}$ macroscopically manifests close-lying energy scales of lattice and electronic degrees of freedom. Hence, epitaxial heterostructures offer fascinating possibilities to manipulate these degrees of freedom. Here, the authors show that the metal-insulator transition in NdNiO${}_{3}$ epitaxial thin films grown on different facets of the same orthorhombic substrate varies over a wide temperature range. Authors’ combined results from electrical transport measurements, scanning transmission electron microscopy, and $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ theory give detailed insights into the interplay of structural pinning, lattice mismatch, and electronic interactions promoting the complex facet and thickness dependence of the metal-insulator transition in NdNiO${}_{3}$.

Y. E. Suyolcu et al.
Phys. Rev. Materials 5, 045001 (2021)

#### Tuneable correlated disorder in alloys

Many desirable material properties may be associated with disorder exhibiting local periodicity or correlations. However, few systems allow systematic studies into the effects of intrinsic crystallographic conflict on correlated disorder. The authors use epitaxial matching to stabilize an exemplar system: the pseudo-bcc U${}_{1-x}$Mo${}_{x}$ alloy, which exhibits a significant mismatch between the basis preferred symmetry and the global lattice. Employing diffuse and inelastic x-ray scattering techniques on 300-nm epitaxial films, combined with $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ modeling, the authors discover a new form of correlated disorder which exhibits strong disorder-phonon coupling that dramatically suppresses phonon lifetimes. These findings have implications across a broad range of materials and could be exploited to develop future functional materials.

D. Chaney et al.
Phys. Rev. Materials 5, 035004 (2021)

###### March 30, 2021

Inducing correlated disorder into a crystalline material could offer a way to tune the material’s phonon properties and thermal conductivity.

Synopsis on:
D. Chaney et al.
Phys. Rev. Materials 5, 035004 (2021)

#### Single-crystal growth and magnetic phase diagram of the enantiopure crystal of ${\mathrm{NdPt}}_{2}\mathrm{B}$

Chirality, which is a fundamental property of symmetry, can produce unique electronic and magnetic properties. The problem is that many of the chiral inorganic compounds form a racemic mixture consisting of right- and left-handed enantiomers. Here, the authors succeeded in growing the enantiopure single crystal of Nd-based monoaxial chiral magnet, demonstrating the nontrivial magnetic phase diagram in this rare-earth chiral magnet with the DM interaction. This ternary rare-earth platinum boride system provides an attractive platform for examining chiral magnetism and the role of DM interaction.

Yoshiki J. Sato et al.
Phys. Rev. Materials 5, 034411 (2021)

#### Eight Journals Introduce Letters

###### March 9, 2021

At the beginning of 2021, eight Physical Review journals began publishing Letters which are intended for the accelerated publication of important new results targeted to the specific readership of each journal.

#### Multistability of isolated and hydrogenated Ga–O divacancies in $\beta -{\mathrm{Ga}}_{2}{\mathrm{O}}_{3}$

The combination of an ultrawide band gap and controllable $n$-type conductivity makes monoclinic gallium sesquioxide a promising material for high-power electronics. However, this technological development will require accurate knowledge about the identity and properties of prominent deep-level defects in the material. This work explores close-associate Ga-O divacancies. Owing to the low symmetry of the crystal structure, divacancies can potentially occur in a plethora of crystallographically inequivalent configurations. Hybrid functional calculations were performed to shed light on the relative stability of different divacancy configurations, the energy barriers for transformation between them, and trends in their electrical properties.

Y. K. Frodason et al.
Phys. Rev. Materials 5, 025402 (2021)

#### Cubic metamaterial crystal supporting broadband isotropic chiral phonons

Chiral metamaterials can support chiral phonons leading to acoustical activity, the acoustical counterpart of optical activity. However, the properties of early metamaterial designs have been very highly anisotropic, and chiral acoustical phonons occurred only for selected high-symmetry directions. The authors propose a novel chiral metamaterial based on “twisting” a truncated octahedron in a simple-cubic unit cell. Not supported by crystal symmetry alone but rather by a tuned degeneracy, chiral phonons and large broadband acoustical activity are obtained for all phonon propagation directions in 3D. This result is notable because even isotropic achiral acoustical phonons are rare for crystalline materials.

Yi Chen et al.
Phys. Rev. Materials 5, 025201 (2021)

#### Large enhancement of thermopower at low magnetic field in compensated semimetals

Dirac and Weyl semimetals are promising candidates for high-efficiency thermoelectrics due to their gapless spectrum and high mobility. Recent experiments have shown that the thermopower of Dirac and Weyl materials can be enormously enhanced by a magnetic field, especially when the material exhibits nearly-complete compensation of electron and hole carriers. Here the authors study theoretically the thermopower of compensated conductors, and they show that a strong increase of thermopower with magnetic field arises generically in compensated systems even at relatively low field values. The full field dependence exhibits a number of different regimes, which are mapped out in detail.

Xiaozhou Feng and Brian Skinner
Phys. Rev. Materials 5, 024202 (2021)

#### Editorial: Promoting Inclusive and Respectful Communications

###### November 18, 2020

APS Editor in Chief, Michael Thoennessen, discusses a new opportunity for communicating authors to include their pronouns together with their contact email in order to promote a more respectful, inclusive, and equitable environment.

#### Collection on Two-dimensional Materials and Devices

###### March 13, 2020

Guest Editor David Tománek introduces a collection of papers in Physical Review Applied and Physical Review Materials on two-dimensional materials and devices, in a snapshot of the leading edge of this hot field.

#### Collection on Two-Dimensional Materials and Devices

Physical Review Applied and Physical Review Materials are pleased to present the Collection on Two-Dimensional Materials and Devices, highlighting one of the most interesting fields in Applied Physics and Materials Research. Papers belonging to this collection will be published throughout 2020. The invited articles, and an editorial by the Guest Editor, David Tománek, are linked in the Collection.

#### Materials Research in the Physical Review Journals

###### August 23, 2017

A discussion of the focus on materials related research in the Physical Review journals.

#### Current Issue

Vol. 5, Iss. 4 — April 2021

#### Announcements

##### APS Announces Outstanding Referees for 2021
###### February 24, 2021

APS has selected 151 Outstanding Referees for 2021 who have demonstrated exceptional work in the assessment of manuscripts published in the Physical Review journals. A full list of the Outstanding Referees is available online.

##### Rapid Communications papers will now be Letters
###### November 23, 2020

Starting January 1, 2021, the Rapid Communications article type will be renamed to Letters. With this change, all eight Physical Review journals that had previously classified articles of the type “Rapid Communications” will adopt the practice of Physical Review Applied and now publish such articles as Letters. Learn more

##### Giulia Galli Becomes a Member of the National Academy of Sciences
###### April 28, 2020

Physical Review Materials is delighted to highlight that journal editorial board member Giulia Galli of the University of Chicago has become a newly elected member of the National Academy of Sciences.

##### Physical Review Materials Presents its First Research Update
###### December 20, 2018

Much is being currently written about machine learning applied to materials science, but, what is machine learning?

##### New Article Type in Physical Review Materials - Research Update
###### August 29, 2018

Physical Review Materials is now publishing Research Updates. Research Updates are relatively brief reviews of the current research status in an important and topical area of materials research. These updates need not be as comprehensive as reviews, instead offering concise updates of the progress, challenges, and potential in a specific field of interest to readers of Physical Review Materials. Typical research updates will be up to approximately 10,000 words in length.

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