Article
Physics, Multidisciplinary
Yaqi Tao
Summary: In this study, we numerically investigate a localization tensor based on the periodic position operator in the one-dimensional Anderson model, Aubry-Andre-Harper model, and slowly varying incommensurate potential models. Due to its compatibility with periodic boundary conditions, this localization tensor properly captures state localization properties, mobility edges, and metal-insulator transitions in these well-known models. Moreover, it outperforms the participation ratio in reflecting the localization properties of extended states, making it a sensitive index for characterizing Anderson transitions.
Article
Materials Science, Multidisciplinary
Xu Xia, Ke Huang, Shubo Wang, Xiao Li
Summary: This paper introduces a new method for finding exact mobility edges in one-dimensional non-Hermitian quasiperiodic models and demonstrates it through a specific model. The results show that the metal-insulator transition occurs simultaneously with the spontaneous PT-symmetry breaking transition in this model.
Article
Materials Science, Multidisciplinary
Yanxia Liu, Yongjian Wang, Zuohuan Zheng, Shu Chen
Summary: This study analytically determines the non-Hermitian mobility edges of a one-dimensional quasiperiodic lattice model and its dual model, breaking the self-duality symmetry. By applying Avila's global theory, the Lyapunov exponent of the Ganeshan-Pixley-Das Sarma model is derived exactly, enabling the analytical expression of the mobility edge of the non-Hermitian dual model. The mobility edge of the original model is obtained through dual transformation, creating exact mappings between the spectra and wave functions of the two models.
Article
Physics, Multidisciplinary
Fangzhao Alex An, Karmela Padavic, Eric J. Meier, Suraj Hegde, Sriram Ganeshan, J. H. Pixley, Smitha Vishveshwara, Bryce Gadway
Summary: This study focuses on the experimental realization of a family of nearest-neighbor tight-binding models with quasiperiodic site energy modulation, and explores the exact mobility edge protected by duality symmetry. The results reveal deviations from single-particle predictions due to attractive interactions affecting state localization differently based on energy levels.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
T. B. Mazitov, A. A. Katanin
Summary: This study investigates the impact of the formation and screening of local magnetic moments on the temperature and interaction dependencies of spectral functions and resistivity. The results indicate that, at half filling, the maximum resistivity corresponds to the appearance of a central quasiparticle peak in the spectral function and the transition to a metallic regime with well-defined fermionic quasiparticles. The temperature at which the screening of local magnetic moments occurs is lower than the temperature scale of the maximum resistivity, and at half filling, it coincides with the boundary corresponding to the exponent of resistivity.
Article
Physics, Multidisciplinary
S. Kettemann
Summary: This review focuses on the theory of metal-insulator transitions in doped semiconductors, with a particular emphasis on the anomalous magnetic properties that arise from the interplay of spin and charge correlations and disorder. The review suggests a structured phase diagram at finite temperature, discusses open problems, and reviews the possibility of finite temperature delocalization transitions.
Article
Multidisciplinary Sciences
Kyuho Lee, Bai Yang Wang, Motoki Osada, Berit H. Goodge, Tiffany C. C. Wang, Yonghun Lee, Shannon Harvey, Woo Jin Kim, Yijun Yu, Chaitanya Murthy, Srinivas Raghu, Lena F. Kourkoutis, Harold Y. Hwang
Summary: The occurrence of superconductivity in proximity to strongly correlated phases of matter has sparked interest in understanding the normal state properties that give rise to superconductivity. The recent discovery of superconductivity in layered nickelates has generated similar interest. However, transport measurements of doped infinite-layer nickelate thin films have been limited by material constraints, including a high density of extended defects. By using a substrate that better stabilizes the growth and reduction conditions, we were able to synthesize doped Nd1-xSrxNiO2 films essentially free from extended defects. This allowed us to observe similar normal state resistivity behaviors to the copper oxides, despite key distinctions in their electronic structure and insulating properties.
Article
Materials Science, Multidisciplinary
Yu-Liang Tao, Tao Qin, Yong Xu
Summary: We theoretically predict a new type of heavy-fermion system, referred to as exceptional heavy-fermion semimetal, by studying a three-dimensional periodic Anderson model. The emergence of Weyl exceptional rings in the Green's function at finite temperatures leads to the appearance of bounded Fermi surfaces. These bounded Fermi surfaces transition to bounded bulk Fermi tubes as temperatures rise, which can be experimentally measured. Our work opens up possibilities for studying exceptional heavy-fermion semimetal phases in three dimensions.
Article
Physics, Multidisciplinary
Maria Chatzieleftheriou, Alexander Kowalski, Maja Berovic, Adriano Amaricci, Massimo Capone, Lorenzo De Leo, Giorgio Sangiovanni, Luca de Medici
Summary: We demonstrate the existence of a finite-doping quantum critical point (QCP) arising from a first-order Mott transition in the phase diagram of a strongly correlated material. By tuning the chemical potential, we find that the Mott transition evolves into a first-order transition between two metals, leading to a phase separation region ending in the finite-doping QCP. This scenario, demonstrated using a minimal multiorbital Hubbard model, has implications beyond iron-based superconductors and shows a strong analogy with cuprate superconductors.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Eric Dohner, Hanna Terletska, Ka-Ming Tam, Juana Moreno, Herbert F. Fotso
Summary: We present a solution for the nonequilibrium dynamics of an interacting disordered system by adapting the equilibrium dynamical mean-field theory and the equilibrium coherent potential approximation methods. Our approach uses the Kadanoff-Baym-Keldysh complex time contour to study the dynamics of interacting disordered systems away from equilibrium. We obtain the equilibrium density of states of the disordered interacting system and observe the effect of disorder on the relaxation of the system.
Article
Materials Science, Multidisciplinary
Zhen Song, You-Shan Zhang, Jing-Yi Shen, Bing Lin, Jie Wu, Ping-Hua Xiang, Chun-Gang Duan, Rui-Hua He
Summary: Perovskite iridates have the potential to host unconventional superconductivity, but Sr2IrO4 thin-film field-effect transistors show a remarkably robust insulating state. This insulating state can be controlled by thermal and oxygen annealing. The findings have important implications for further research on superconductivity in Sr2IrO4 thin films.
NPG ASIA MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jacob Park, Ehsan Khatami
Summary: This research utilized numerical methods to study the thermodynamic properties of the disordered Fermi-Hubbard model on different geometries and explored the effects of disorder on the system properties.
Article
Multidisciplinary Sciences
Aditya Sood, Xiaozhe Shen, Yin Shi, Suhas Kumar, Su Ji Park, Marc Zajac, Yifei Sun, Long-Qing Chen, Shriram Ramanathan, Xijie Wang, William C. Chueh, Aaron M. Lindenberg
Summary: Understanding the pathways and time scales underlying electrically driven insulator-metal transitions is vital for uncovering the fundamental limits of device operation. By using stroboscopic electron diffraction, researchers discovered an electrically triggered, isostructural state that forms transiently on microsecond time scales and established electrical excitation as a route for uncovering nonequilibrium and metastable phases in correlated materials. This metastable phase is similar to that formed under photoexcitation within picoseconds, suggesting a universal transformation pathway.
Article
Multidisciplinary Sciences
Senad Bulja, Rose Kopf, Al Tate, Mark Cappuzzo, Dmitry Kozlov, Holger Claussen, Dirk Wiegner, Wolfgang Templ, Dariush Mirshekar-Syahkal
Summary: Resistive switching (RS) of Transition Metal Oxides (TMOs) is a promising option for the development of next generation memory and 6G wireless communication technologies. The exact mechanism of RS is not yet fully understood, but it is believed to involve the formation and rupture of conductive filaments in the oxide materials. The study reveals the differences in switching behavior and resistance between amorphous TiO2 and NiO, with TiO2 showing superior high frequency characteristics. These findings are important for understanding the conduction mechanism in binary/multinary oxides and enabling their use in non-volatile memory and 6G applications.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
C. L. Tschirhart, Evgeny Redekop, Lizhong Li, Tingxin Li, Shengwei Jiang, T. Arp, O. Sheekey, Takashi Taniguchi, Kenji Watanabe, M. E. Huber, Kin Fai Mak, Jie Shan, A. F. Young
Summary: Magnetic switching via spin-orbit torque is demonstrated in a moire bilayer, providing a platform for spintronic applications.