Author(s): Guido Pupillo, Primož Ziherl, and Fabio Cinti
Quasicrystals remain among the most intriguing materials in physics and chemistry. Their structure results in many unusual properties, including anomalously low friction as well as poor electrical and thermal conductivity, but it also supports superconductivity, which shows that quantum effects in q...
[Phys. Rev. B 101, 134522] Published Wed Apr 29, 2020
Author(s): Christophe Candolfi, Martin Míšek, Patrick Gougeon, Rabih Al Rahal Al Orabi, Philippe Gall, Régis Gautier, Sylvie Migot, Jaafar Ghanbaja, Jiří Kaštil, Petr Levinský, Jiří Hejtmánek, Anne Dauscher, Bernard Malaman, and Bertrand Lenoir
The competition between charge density wave (CDW) and superconductivity is a central theme in condensed-matter physics with ramifications to correlated electron systems and high-temperature superconductivity. While the emergence of superconductivity is often observed upon suppressing the CDW transit...
[Phys. Rev. B 101, 134521] Published Wed Apr 29, 2020
Author(s): H. Nakamura, A. Mohammed, Ph. Rosenzweig, K. Matsuda, K. Nowakowski, K. Küster, P. Wochner, S. Ibrahimkutty, U. Wedig, H. Hussain, J. Rawle, C. Nicklin, B. Stuhlhofer, G. Cristiani, G. Logvenov, H. Takagi, and U. Starke
We present the electronic and structural properties of monolayer WSe2 grown by pulsed-laser deposition on monolayer graphene (MLG) on SiC. The spin splitting in the WSe2 valence band at K¯ was ΔSO=0.469±0.008 eV, as determined by angle-resolved photoemission spectroscopy. Synchrotron-based grazing-i...
[Phys. Rev. B 101, 165103] Published Mon Apr 06, 2020
Author(s): Jonathan Ma, Ming Yi, Gregory Affeldt, Ian Hayes, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, James Analytis, Robert Birgeneau, and Alessandra Lanzara
Nematicity, where rotational symmetry is broken while translational symmetry is conserved, is prevalent in high-temperature superconductors. In particular, nematic quantum critical point has been universally found near the optimum doping of the superconducting dome of several iron-based superconduct...
[Phys. Rev. B 101, 094515] Published Thu Mar 26, 2020
Author(s): Jonas Kiemle, Florian Sigger, Michael Lorke, Bastian Miller, Kenji Watanabe, Takashi Taniguchi, Alexander Holleitner, and Ursula Wurstbauer
Valley selective hybridization and residual coupling of electronic states in commensurate van der Waals (vdW) heterobilayers enable the control of the orbital character of interlayer excitons. We demonstrate electric field control of layer index, orbital character, lifetime, and emission energy of i...
[Phys. Rev. B 101, 121404(R)] Published Wed Mar 18, 2020
Author(s): Srivani Javvaji, Jin-Hua Sun, and Jeil Jung
Twisted bilayer graphene (TBG) hosts nearly flat bands with narrow bandwidths of a few meV at certain magic twist angles. Here we show that in twisted gapped Dirac material bilayers, or massive twisted bilayer graphenes (MTBG), isolated nearly flat bands below a threshold bandwidth Wc are expected f...
[Phys. Rev. B 101, 125411] Published Thu Mar 12, 2020
Author(s): Ke Yang, Fengren Fan, Hongbo Wang, D. I. Khomskii, and Hua Wu
Two-dimensional (2D) magnetic materials are of great current interest for their promising applications in spintronics. Here we propose the van der Waals (vdW) material VI3 to be a 2D Ising ferromagnet (FM), using density functional calculations, crystal field level diagrams, superexchange model anal...
[Phys. Rev. B 101, 100402(R)] Published Tue Mar 10, 2020
Klara Volckaertcongrats everyone! :)
Author(s): Ann Julie Holt, Sanjoy K. Mahatha, Raluca-Maria Stan, Frode S. Strand, Thomas Nyborg, Davide Curcio, Alex K. Schenk, Simon P. Cooil, Marco Bianchi, Justin W. Wells, Philip Hofmann, and Jill A. Miwa
By creating a sharp and dense dopant profile of phosphorus atoms buried within a silicon host, a two-dimensional electron gas is formed within the dopant region. Quantum confinement effects induced by reducing the thickness of the dopant layer, from 4.0nm to the single-layer limit, are explored usin...
[Phys. Rev. B 101, 121402(R)] Published Thu Mar 05, 2020
Author(s): Poonam Kumari, Joydeep Chatterjee, and Priya Mahadevan
Spin-orbit interactions lead to a large spin splitting of the valence band maximum at K in MoSe2 monolayer. However, on stacking a second layer of MoSe2 in the same manner (2H) as found in the bulk, one finds that there is no net spin splitting. This has been attributed to the presence of inversion ...
[Phys. Rev. B 101, 045432] Published Thu Jan 30, 2020
Author(s): S. Sahoo, U. Dutta, L. Harnagea, A. K. Sood, and S. Karmakar
We report pressure evolution of charge density wave (CDW) order and the emergence of superconductivity (SC) in 1T−VSe2 single crystal by studying resistance and magnetoresistance behavior under high pressure. With increasing quasihydrostatic pressure the CDW order enhances with its ordering temperat...
[Phys. Rev. B 101, 014514] Published Thu Jan 30, 2020
Nature, Published online: 22 January 2020; doi:10.1038/s41586-019-1904-x
A synthetic approach is described, for efficiently converting non-van der Waals solids into two-dimensional van der Waals transition-metal chalcogenide layers with specific phases, enabling the high-throughput production of monolayers.Author(s): Fabio Caruso, Dino Novko, and Claudia Draxl
Time- and angle-resolved photoemission spectroscopy (tr-ARPES) constitutes a powerful tool to inspect the dynamics and thermalization of hot carriers. The identification of the processes that drive the dynamics, however, is challenging even for the simplest systems owing to the coexistence of severa...
[Phys. Rev. B 101, 035128] Published Thu Jan 16, 2020
Author(s): C. W. Nicholson, E. F. Schwier, K. Shimada, H. Berger, M. Hoesch, C. Berthod, and C. Monney
We revisit charge density wave (CDW) behavior in the archetypal quasi-one-dimensional (quasi-1D) material NbSe3 by high-resolution angle-resolved photoemission spectroscopy measurements utilizing a microfocused laser with a photon energy of 6.3 eV. We present a detailed view of the electronic struct...
[Phys. Rev. B 101, 045412] Published Mon Jan 13, 2020
Author(s): Guangyao Miao, Siwei Xue, Bo Li, Zijian Lin, Bing Liu, Xuetao Zhu, Weihua Wang, and Jiandong Guo
Recently the charge density wave (CDW) in vanadium dichalcogenides have attracted increasing research interest, but a real-space investigation on the symmetry breaking of the CDW state in VTe2 monolayer is still lacking. We have investigated the CDW of VTe2 monolayer by low energy electron diffracti...
[Phys. Rev. B 101, 035407] Published Wed Jan 08, 2020
Author(s): G. Vinai, C. Bigi, A. Rajan, M. D. Watson, T.-L. Lee, F. Mazzola, S. Modesti, S. Barua, M. Ciomaga Hatnean, G. Balakrishnan, P. D. C. King, P. Torelli, G. Rossi, and G. Panaccione
Among transition-metal dichalcogenides, mono and few-layers thick VSe2 has gained much recent attention following claims of intrinsic room-temperature ferromagnetism in this system, which have nonetheless proved controversial. Here, we address the magnetic and chemical properties of Fe/VSe2 heterost...
[Phys. Rev. B 101, 035404] Published Wed Jan 08, 2020
Author(s): Ro-Ya Liu, Meng-Kai Lin, Peng Chen, Takeshi Suzuki, Pip C. J. Clark, Nathan K. Lewis, Cephise Cacho, Emma Springate, Chia-Seng Chang, Kozo Okazaki, Wendy Flavell, Iwao Matsuda, and Tai-Chang Chiang
Understanding carrier creation and evolution in materials initiated by pulsed optical excitation is central to developing ultrafast optoelectronics. We demonstrate herein that the dynamic response of a system can be drastically modified when its physical dimension is reduced to the atomic scale, the...
[Phys. Rev. B 100, 214309] Published Tue Dec 17, 2019
Author(s): C. Cirillo, V. Granata, G. Avallone, R. Fittipaldi, C. Attanasio, A. Avella, and A. Vecchione
A comprehensive study of the behavior of the Mott insulator Ca2RuO4 under electrical current drive is performed by combining two experimental probes: the macroscopic electrical transport and the microscopic x-ray diffraction. The resistivity, ρ, versus electric current density, J, and temperature, T...
[Phys. Rev. B 100, 235142] Published Fri Dec 27, 2019
Author(s): J. Tu, X. B. Chen, X. Z. Ruan, Y. F. Zhao, H. F. Xu, Z. D. Chen, X. Q. Zhang, X. W. Zhang, J. Wu, L. He, Y. Zhang, R. Zhang, and Y. B. Xu
Centrosymmetric (CS) nonmagnetic materials with hidden spin polarization induced by non-CS site symmetries and spin-orbit coupling are promising candidates for spintronic applications, in light of the zero net spin polarization and modulatable spin effects hidden in the local structures. There is, h...
[Phys. Rev. B 101, 035102] Published Fri Jan 03, 2020
Author(s): Klara Volckaert, Habib Rostami, Deepnarayan Biswas, Igor Marković, Federico Andreatta, Charlotte E. Sanders, Paulina Majchrzak, Cephise Cacho, Richard T. Chapman, Adam Wyatt, Emma Springate, Daniel Lizzit, Luca Bignardi, Silvano Lizzit, Sanjoy K. Mahatha, Marco Bianchi, Nicola Lanata, Phil D. C. King, Jill A. Miwa, Alexander V. Balatsky, Philip Hofmann, and Søren Ulstrup
In solid state photoemission experiments it is possible to extract information about the symmetry and orbital character of the electronic wave functions via the photoemission selection rules that shape the measured intensity. This approach can be expanded in a pump-probe experiment where the intensi...
[Phys. Rev. B 100, 241406(R)] Published Thu Dec 12, 2019
Author(s): Habib Rostami, Klara Volckaert, Nicola Lanata, Sanjoy K. Mahatha, Charlotte E. Sanders, Marco Bianchi, Daniel Lizzit, Luca Bignardi, Silvano Lizzit, Jill A. Miwa, Alexander V. Balatsky, Philip Hofmann, and Søren Ulstrup
In this work, we provide an effective model to evaluate the one-electron dipole matrix elements governing optical excitations and the photoemission process of single-layer (SL) and bilayer (BL) transition metal dichalcogenides. By utilizing a k·p Hamiltonian, we calculate the photoemission intensity...
[Phys. Rev. B 100, 235423] Published Thu Dec 12, 2019
Author(s): Yuan Wang, Junhai Ren, Jiaheng Li, Yujia Wang, Huining Peng, Pu Yu, Wenhui Duan, and Shuyun Zhou
Angle-resolved photoemission spectroscopy measurements reveal the evidence of a charge density wave (CDW) and the underlying mechanism in a monolayer VTe2 film. The Fermi surface map is partially gapped and shows an arc shape. The CDW gap is found to be rather anisotropic and attributed to the imperfect nesting. First-principles calculations further indicate electron-phonon coupling at the corresponding wave vector. These observations suggest that both Fermi surface nesting and phonon instability contribute significantly to the CDW formation in this monolayer VTe2 film.
[Phys. Rev. B 100, 241404(R)] Published Mon Dec 09, 2019
Author(s): Hengdi Zhao, Bing Hu, Feng Ye, Christina Hoffmann, Itamar Kimchi, and Gang Cao
Simultaneous control of structural and physical properties via applied electrical current poses a new, key research topic with both fundamental and technological significance. Studying the spin-orbit-coupled antiferromagnet Ca2RuO4, and its derivative with 3% Mn doping to alleviate the violent first...
[Phys. Rev. B 100, 241104(R)] Published Wed Dec 11, 2019
Nature Physics, Published online: 28 October 2019; doi:10.1038/s41567-019-0696-0
A technique analogous to angle-resolved photoemission spectroscopy used in materials characterization has been developed for interacting Fermi gases in an optical lattice, providing information on the single-particle excitations in a many-body system.Author(s): P. O. Sukhachov, Vladimir Juričić, and A. V. Balatsky
We formulate a general framework for addressing both odd- and even-frequency superconductivity in Dirac semimetals and demonstrate that the odd-frequency or the Berezinskii pairing can naturally appear in these materials because of the chirality degree of freedom. We show that repulsive frequency-de...
[Phys. Rev. B 100, 180502(R)] Published Mon Nov 11, 2019
Author(s): Dominik Christiansen, Malte Selig, Ermin Malic, Ralph Ernstorfer, and Andreas Knorr
The family of two-dimensional semiconductors exhibits a variety of bright and dark exciton states with many possible interaction channels. Here, the authors develop a theoretical description of exciton dynamics in time- and angle-resolved photoemission spectroscopy (trARPES). Due to its simultaneous time and momentum resolution, trARPES has direct access to the interplay of optically bright and dark excitons and allows resolution of exciton formation and thermalization on a femtosecond time scale throughout the Brillouin zone.
[Phys. Rev. B 100, 205401] Published Fri Nov 01, 2019
Author(s): Ya-Wen Chuang, Jing Li, Hailong Fu, Kenji Watanabe, Takashi Taniguchi, and Jun Zhu
Heterostructures formed between two different van der Waals materials enable interactions and functionalities absent in each component. In this work we show that vicinity to an atomically thin WSe2 sheet dramatically impacts the energies of the symmetry-broken low Landau levels of bilayer graphene, ...
[Phys. Rev. B 100, 195402] Published Mon Nov 04, 2019
Author(s): Klaus Zollner and Jaroslav Fabian
We present a detailed study of the electronic and spin-orbit properties of single and bilayer graphene in proximity to the topological insulator Bi2Se3. Our approach is based on first-principles calculations, combined with symmetry derived model Hamiltonians that capture the low-energy band properti...
[Phys. Rev. B 100, 165141] Published Mon Oct 28, 2019
Author(s): Hongyuan Wang, Hao Su, Jiuyang Zhang, Wei Xia, Yishi Lin, Xiaolei Liu, Xiaofei Hou, Zhenhai Yu, Na Yu, Xia Wang, Zhiqiang Zou, Yihua Wang, Qifeng Liang, Yuhua Zhen, and Yanfeng Guo
We report systematic magnetotransport measurements and ab initio calculations on single-crystalline TaP2, a member of the transition-metal dipnictides. We observed unsaturated magnetoresistance (MR) reaching ∼700% at a magnetic field (B) of 9 T at 2 K when B is perpendicular to the electric current ...
[Phys. Rev. B 100, 115127] Published Fri Sep 13, 2019
Author(s): A. Hichri, S. Jaziri, and M. O. Goerbig
We theoretically study the role of the Berry curvature on neutral and charged excitons in two-dimensional transition metal dichalcogenides. The Berry curvature arises due to a strong coupling between the conduction and valence bands in these materials that can to great extent be described within the...
[Phys. Rev. B 100, 115426] Published Mon Sep 16, 2019
Author(s): Zhen Tian, Yu Gan, Taiming Zhang, Binbin Wang, Hengxing Ji, Yexin Feng, and Jiamin Xue
Black phosphorus has attracted great research interest due to its numerous applications in electronic devices, optoelectronic devices, energy storage, and so on. Compared with the majority of two-dimensional materials, black phosphorus possesses a unique property—its strong in-plane anisotropy. All ...
[Phys. Rev. B 100, 085440] Published Fri Aug 30, 2019