Author(s): Seungho Seong, Heejung Kim, Kyoo Kim, B. I. Min, Y. S. Kwon, Sang Wook Han, Byeong-Gyu Park, R. Stania, Yeonji Seo, and J.-S. Kang
The electronic structures of ErTe3, having double charge density wave (CDW) transitions, have been investigated by performing polarization- and temperature (T)-dependent angle-resolved photoemission spectroscopy (ARPES) and Er 4d→4f resonant PES measurements for high-quality single crystals. It is f...
[Phys. Rev. B 104, 195153] Published Mon Nov 29, 2021
Author(s): Francesco Petocchi, Viktor Christiansson, and Philipp Werner
The reliable ab initio description of strongly correlated materials is a long-sought capability in condensed matter physics. The combination of GW and extended dynamical mean-field theory (EDMFT) method is a promising scheme which provides a self-consistent description of correlations and screening,...
[Phys. Rev. B 104, 195146] Published Tue Nov 23, 2021
Author(s): Ethan R. A. Fletcher, Kentaro Higashi, Yoav Kalcheim, Hiroshi Kageyama, and Benjamin A. Frandsen
The local structure of V2O3, an archetypal strongly correlated electron system that displays a metal-insulator transition around 160 K, has been investigated via pair distribution function (PDF) analysis of neutron and x-ray total scattering data. The rhombohedral-to-monoclinic structural phase tran...
[Phys. Rev. B 104, 184115] Published Tue Nov 23, 2021
Author(s): Darien J. Morrow and Xuedan Ma
Transition metal dichalcogenide heterostructures can host interlayer excitons (IXs), which consist of electrons and holes spatially separated in different layers. IXs possess permanent dipoles and have proven to offer a wealth of novel physics. We develop a discrete, random-walk model which includes...
[Phys. Rev. B 104, 195302] Published Thu Nov 11, 2021
Author(s): Santu K. Bera, Megha Shrivastava, Khamari Bramhachari, Hanyu Zhang, Ajay K. Poonia, Dipendranath Mandal, E. M. Miller, Matthew C. Beard, Amit Agarwal, and K. V. Adarsh
Coulomb interactions in atomically thin transition metal dichalcogenides can be dynamically engineered by exploiting the dielectric environment to control the optical and electronic properties. Here we demonstrate an optically tunable giant band-gap renormalization (BGR) ∼1200 and 850 meV from the e...
[Phys. Rev. B 104, L201404] Published Thu Nov 11, 2021
Author(s): Caio C. Silva, Daniela Dombrowski, Abdus Samad, Jiaqi Cai, Wouter Jolie, Joshua Hall, Paul T. P. Ryan, Pardeep K. Thakur, David A. Duncan, Tien-Lin Lee, Udo Schwingenschlögl, and Carsten Busse
We determined the structure of epitaxial 2H−TaS2 on Au(111) using the method of x-ray standing waves (XSW), supported by density functional theory (DFT) calculations and scanning tunneling microscopy (STM). The lattice mismatch between substrate and overlayer gives rise to a moiré superstructure, wh...
[Phys. Rev. B 104, 205414] Published Tue Nov 09, 2021
Author(s): Qiangsheng Lu, Kyle Y. Chen, Matthew Snyder, Jacob Cook, Duy Tung Nguyen, P. V. Sreenivasa Reddy, Tay-Rong Chang, Shengyuan A. Yang, and Guang Bian
The discovery of graphene has stimulated enormous interest in two-dimensional (2D) electron gas with linear band dispersion. However, to date, 2D Dirac semimetals are still very rare due to the fact that 2D Dirac states are generally fragile against perturbations such as spin-orbit coupling. Nonsymm...
[Phys. Rev. B 104, L201105] Published Wed Nov 10, 2021
Author(s): Gyanendra Dhakal, Fairoja Cheenicode Kabeer, Arjun K. Pathak, Firoza Kabir, Narayan Poudel, Randall Filippone, Jacob Casey, Anup Pradhan Sakhya, Sabin Regmi, Christopher Sims, Klauss Dimitri, Pietro Manfrinetti, Krzysztof Gofryk, Peter M. Oppeneer, and Madhab Neupane
Recently, kagome materials have become an engrossing platform to study the interplay among symmetry, magnetism, topology, and electron correlation. The latest works on RMn6Sn6 (R = rare-earth metal) compounds have illustrated that this family could be intriguing to investigate various physical pheno...
[Phys. Rev. B 104, L161115] Published Tue Oct 26, 2021
Author(s): Zilu Wang, Qiangwei Yin, Shaohua Yan, Linlu Wu, Xuchuan Wu, Man Li, Wenhua Song, Qingxin Liu, Huan Ma, Wei Ji, Hechang Lei, and Shancai Wang
We apply high-resolution angle-resolved photoemission spectroscopy to explore the layered transition-metal dichalcogenide 1T−VSe2 with various photon energies to investigate the three-dimensional (3D) charge-density wave (CDW) transition. Here, we provide quite comprehensive evidence of 3D Fermi sur...
[Phys. Rev. B 104, 155134] Published Thu Oct 21, 2021
Author(s): Munisa Nurmamat, Sergey V. Eremeev, Xiaoxiao Wang, Tomoki Yoshikawa, Takashi Kono, Masaaki Kakoki, Takayuki Muro, Qi Jiang, Zhipeng Sun, Mao Ye, and Akio Kimura
Transition-metal dichalcogenides (TMDCs) hosting type-II Dirac fermions have attracted a great deal of research interest owing to their rich application capabilities. Here, we have systematically investigated the bulk and surface electronic structures of type-II Dirac semimetal NiTe2 by means of ang...
[Phys. Rev. B 104, 155133] Published Thu Oct 21, 2021
Author(s): Arnab Pariari, Sudipta Koley, Shubhankar Roy, Ratnadwip Singha, Mukul S. Laad, A. Taraphder, and Prabhat Mandal
Charge density wave (CDW) states in solids bear an intimate connection to underlying fermiology. Thus, modification of the latter by suitable perturbations provides an attractive handle to unearth CDW states. Here, we combine extensive magnetotransport experiments and first-principles correlated ele...
[Phys. Rev. B 104, 155147] Published Mon Oct 25, 2021
Author(s): Fatima Alarab, Karol Hricovini, Berengar Leikert, Laurent Nicolaï, Mauro Fanciulli, Olivier Heckmann, Christine Richter, Lucie Prušakova, Zdeňek Jansa, Pavol Šutta, Julien Rault, Patrick Lefevre, Michael Sing, Matthias Muntwiler, Ralph Claessen, and Ján Minár
We combined photoelectron spectroscopy with first-principles calculations to investigate electronic properties of SrTiO3 doped with Ni impurities. High-quality epitaxial pristine SrTiO3 and SrTiO3:Nix films with x=0.06 and 0.12 were prepared by pulsed laser deposition. Electronic band structure calc...
[Phys. Rev. B 104, 165129] Published Mon Oct 18, 2021
Author(s): A. A. Rybkina, S. O. Filnov, A. V. Tarasov, D. V. Danilov, M. V. Likholetova, V. Yu. Voroshnin, D. A. Pudikov, D. A. Glazkova, A. V. Eryzhenkov, I. A. Eliseyev, V. Yu. Davydov, A. M. Shikin, and A. G. Rybkin
Modification of the electronic and crystal structure of zero-layer graphene grown on 6H-SiC(0001) after Co intercalation is reported. Using a wide range of techniques including angle-resolved photoelectron spectroscopy, x-ray photoelectron spectroscopy, Raman spectroscopy, low-energy electron diffra...
[Phys. Rev. B 104, 155423] Published Mon Oct 18, 2021
Author(s): G. Gatti, D. Gosálbez-Martínez, Q. S. Wu, J. Hu, S. N. Zhang, G. Autès, M. Puppin, D. Bugini, H. Berger, L. Moreschini, I. Vobornik, J. Fujii, J.- P. Ansermet, O. V. Yazyev, and A. Crepaldi
TaSe3 is a layered van der Waals semimetal with several inverted band gaps throughout the entire Brillouin zone and nontrivial Z2 topological indices, which place it at the boundary between a strong and a weak topological phase. Our transport experiments reveal a quadratic nonsaturating magnetoresis...
[Phys. Rev. B 104, 155122] Published Wed Oct 13, 2021
Author(s): Antonio Rossi, Vsevolod Ivanov, Sudheer Sreedhar, Adam L. Gross, Zihao Shen, Eli Rotenberg, Aaron Bostwick, Chris Jozwiak, Valentin Taufour, Sergey Y. Savrasov, and Inna M. Vishik
Co3Sn2S2 is a magnetic Weyl semimetal, in which ferromagnetic ordering at 177 K is predicted to stabilize Weyl points. We perform temperature and spatial dependent angle-resolved photoemission spectroscopy measurements through the Curie temperature (Tc), which show large band shifts and renormalizat...
[Phys. Rev. B 104, 155115] Published Mon Oct 11, 2021
Author(s): L. H. Fowler-Gerace, D. J. Choksy, and L. V. Butov
Indirect excitons (IXs), also known as interlayer excitons, can form the medium for excitonic devices whose operation is based on controlled propagation of excitons. A proof of principle for excitonic devices was demonstrated in GaAs heterostructures where the operation of excitonic devices is limit...
[Phys. Rev. B 104, 165302] Published Fri Oct 08, 2021
Author(s): Davide Curcio et al.
We show that the presence of a transiently excited hot electron gas in graphene leads to a substantial broadening of the C 1s line probed by time-resolved x-ray photoemission spectroscopy. The broadening is found to be caused by an exchange of energy and momentum between the photoemitted core electr...
[Phys. Rev. B 104, L161104] Published Wed Oct 06, 2021
Author(s): A. M. Shikin, D. A. Estyunin, N. L. Zaitsev, D. Glazkova, I. I. Klimovskikh, S. O. Filnov, A. G. Rybkin, E. F. Schwier, S. Kumar, A. Kimura, N. Mamedov, Z. Aliev, M. B. Babanly, K. Kokh, O. E. Tereshchenko, M. M. Otrokov, E. V. Chulkov, K. A. Zvezdin, and A. K. Zvezdin
Recently discovered intrinsic antiferromagnetic topological insulator MnBi2Te4 presents an exciting platform for realization of the quantum anomalous Hall effect and a number of related phenomena at elevated temperatures. An important characteristic making this material attractive for applications i...
[Phys. Rev. B 104, 115168] Published Thu Sep 30, 2021
Author(s): S. Samaneh Ataei and Ali Sadeghi
Gate induced carriers impact the many-body interactions in monolayer transition metal dichalcogenides (TMDs) by modifying the screened Coulomb potential and renormalizing the band gap, thus influencing the strong excitonic effects in these materials. Using the GW approximation and a plasmon pole the...
[Phys. Rev. B 104, 155301] Published Mon Oct 04, 2021
Author(s): S. J. Magorrian, V. V. Enaldiev, V. Zólyomi, F. Ferreira, V. I. Fal'ko, and D. A. Ruiz-Tijerina
Moiré superlattices in twisted van der Waals bilayers of WSe2 are determined by weak ferroelectric charge transfer in inversion-asymmetric structures, piezoelectricity, and interlayer hybridization. Here, the authors map out the properties of twisted WSe2 bilayers using an abinitio k⋅p tight-binding multiscale modeling approach, taking into account the lack of inversion symmetry in the monolayer unit cell, and analyzing both parallel (P) and antiparallel (AP) interlayer orientations. They demonstrate that mesoscale Hubbard lattices with high spin-valley degeneracy, and highly anisotropic delocalized states, are accessible by the choice of twist angle and relevant valley.
[Phys. Rev. B 104, 125440] Published Tue Sep 28, 2021
Author(s): Benrui Huang, Lin Wang, Ni Ma, Kaiyi Li, Jingpeng Song, Gang Chen, and Ang Li
Using scanning tunneling microscopy/spectroscopy (STM/STS), we investigate the local atomic and electronic structure of the archetype charge density wave (CDW) system TaSe2. Two structural phases with distinct CDW orders, namely 3×3−2H and 13×13−1T phases, coexist at low temperatures and an intermed...
[Phys. Rev. B 104, 115136] Published Mon Sep 20, 2021
Author(s): Kristian Mæland, Håkon I. Røst, Justin W. Wells, and Asle Sudbø
The fermionic self-energy on the surface of a topological insulator proximity coupled to ferro- and antiferromagnetic insulators is studied. An enhanced electron-magnon coupling is achieved by allowing the electrons on the surface of the topological insulator to have a different exchange coupling to...
[Phys. Rev. B 104, 125125] Published Fri Sep 17, 2021
Author(s): Azadeh Faridi, Dimitrie Culcer, and Reza Asgari
The quasiparticle band-gap renormalization induced by the doped carriers is an important and well-known feature in two-dimensional semiconductors, including transition-metal dichalcogenides (TMDs), and it is of both theoretical and practical interest. To get a quantitative understanding of this effe...
[Phys. Rev. B 104, 085432] Published Thu Aug 26, 2021
Author(s): Huanlong Liu, Shangxiong Huangfu, Xiaofu Zhang, Hai Lin, and Andreas Schilling
We systematically investigated the superconducting properties and the interplay between charge density waves (CDWs) and superconductivity (SC) in lithium-intercalated 2H−TaS2. By gradually increasing the lithium content x, the CDW formation temperature is continuously suppressed, and the onset tempe...
[Phys. Rev. B 104, 064511] Published Wed Aug 25, 2021
Author(s): Maria Spethmann, Carsten Honerkamp, and Dante M. Kennes
When hexagonal boron nitride (hBN) and graphene are aligned at zero or a small twist angle, a moiré structure is formed due to the small lattice constant mismatch between the two structures. In this paper, we analyze magnetic ordering tendencies, driven by on-site Coulomb interactions, of encapsulat...
[Phys. Rev. B 104, 085147] Published Wed Aug 25, 2021
Transition metal dichalcogenide (TMD)/graphene (Gr) heterostructures constitute a key component for two-dimensional devices. The operation of TMD/Gr devices relies on interfacial charge/energy transfer processes, which remains unclear and challenging to unravel. Fortunately, the coupled spin and valley index in TMDs adds a new degree of freedom to the charges and, thus, another dimension to spectroscopy. Here, by helicity-resolved ultrafast spectroscopy, we find that photoexcitation in TMDs transfers to graphene by asynchronous charge transfer, with one type of charge transferring in the order of femtoseconds and the other in picoseconds. The rate correlates well with energy offset between TMD and graphene, regardless of compositions and charge species. Spin-polarized hole injection or long-lived polarized hole can be achieved with deliberately designed heterostructures. This study shows helicity-resolved ultrafast spectroscopy as a powerful and facile approach to reveal the fundamental and complex charge/spin dynamics in TMD-based heterostructures, paving the way toward valleytronic and optoelectronic applications.
Author(s): Bo Chen, Dinghui Wang, Zhicheng Jiang, Bo Zhang, Shengtao Cui, Jingwen Guo, Hangkai Xie, Yong Zhang, Muhammad Naveed, Yu Du, Xuefeng Wang, Haijun Zhang, Fucong Fei, Dawei Shen, Zhe Sun, and Fengqi Song
Intrinsic magnetic topological insulators (MTIs) MnBi2Te4 and MnBi2Te4/(Bi2Te3)n are expected to realize the high-temperature quantum anomalous Hall effect and dissipationless electrical transport. However, there is still a lack of ideal MTI candidates with magnetic ordering of the ferromagnetic (FM...
[Phys. Rev. B 104, 075134] Published Wed Aug 18, 2021
Author(s): Francisco Sánchez-Ochoa, Andrés R. Botello-Méndez, and Cecilia Noguez
In graphene moiré superlattices, electronic interactions between layers are mostly hidden as band structures get crowded because of folding, making their interpretation cumbersome. Here, the evolution of the electronic band structure as a function of the interlayer rotation angle is studied using de...
[Phys. Rev. B 104, 075430] Published Tue Aug 17, 2021
Solid-state systems can host a variety of thermodynamic phases that can be controlled with magnetic fields, strain, or laser excitation. Many phases that are believed to exhibit exotic properties only exist on the nanoscale, coexisting with other phases that make them challenging to study, as measurements require both nanometer spatial resolution and spectroscopic information, which are not easily accessible with traditional x-ray spectromicroscopy techniques. Here, we use coherent diffractive imaging spectroscopy (CDIS) to acquire quantitative hyperspectral images of the prototypical quantum material vanadium oxide across the vanadium L2,3 and oxygen K x-ray absorption edges with nanometer-scale resolution. We extract the full complex refractive indices of the monoclinic insulating and rutile conducting phases of VO2 from a single sample and find no evidence for correlation-driven phase transitions. CDIS will enable quantitative full-field x-ray spectromicroscopy for studying phase separation in time-resolved experiments and other extreme sample environments where other methods cannot operate.
Author(s): M. Wu, X. Huang, K. H. L. Zhang, S. Hu, L. Chen, H.-Q. Wang, and J. Kang
Cobalt oxides with multiple local Co-O coordination environments such as octahedral, tetrahedral, and tetragonal networks display versatile electronic and magnetic properties which have attracted great interest in many fields. Understanding the ground-state properties and determining the fundamental...
[Phys. Rev. B 104, 075109] Published Fri Aug 06, 2021