Article
Chemistry, Physical
J. Falson, I. Sodemann, B. Skinner, D. Tabrea, Y. Kozuka, A. Tsukazaki, M. Kawasaki, K. von Klitzing, J. H. Smet
Summary: The study investigates low-temperature phases of strongly interacting electrons using zinc oxide-based two-dimensional electron systems, revealing correlated metallic and insulating states, non-monotonic spin polarizability, and a significant positive magnetoresistance. These findings establish zinc oxide as a platform for studying strongly correlated electrons in two dimensions.
Article
Multidisciplinary Sciences
George McArdle, Igor Lerner
Summary: This study investigates the conditions for electron-phonon decoupling in suspended films and demonstrates the manifestation of a bistability in electron temperature through hysteretic jumps in nonlinear current-voltage characteristics. The findings suggest that this regime is achievable in systems with an Arrhenius form of equilibrium conductivity, but is practically unreachable in materials with Mott or Efros-Shklovskii hopping.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Rikumaru Saito, Youhei Iida, Takuya Kobayashi, Hiromi Taniguchi, Noriaki Matsunaga, Shuhei Fukuoka, Atsushi Kawamoto
Summary: Studies of the quasi-two-dimensional organic conductors lambda-(D)(2)MCl4 [D = donor molecules, M = Ga, Fe] have shown that lambda-(BETS)(2)GaCl4 undergoes an unconventional superconducting transition and lambda-(BETS)(2)FeCl4 undergoes a field-induced superconducting transition. The interactions between donor molecules and FeCl4- (pi-d interactions) are important. However, a pair of magnetic M = Fe and nonmagnetic M = Ga salts with the same ground state has not been found, and few experimental studies have considered pi-d interaction paths. It has been found that the inner chalcogen of donor molecules is important as the path of the interaction.
Article
Chemistry, Physical
Victor Fung, Jiaxin Zhang, Guoxiang Hu, P. Ganesh, Bobby G. Sumpter
Summary: The study introduces an inverse design framework utilizing invertible neural networks to map between design space and target properties for generating materials candidates with desired properties. The approach demonstrates the capability to generate novel, high fidelity, and diverse materials candidates in MoS2, and can be extended to other materials and their corresponding design spaces and target properties.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
T. Shang, Y. Chen, W. Xie, D. J. Gawryluk, R. Gupta, R. Khasanov, X. Y. Zhu, H. Zhang, Z. X. Zhen, B. C. Yu, Z. Zhou, Y. Xu, Q. F. Zhan, E. Pomjakushina, H. Q. Yuan, T. Shiroka
Summary: This study presents a comprehensive investigation of the microscopic superconducting properties of the CuIr2-xRuxTe4 superconductors. It reveals the existence of multigap superconductivity and a transition to more conventional superconductivity under applied pressure.
Article
Materials Science, Multidisciplinary
Samuel Berman, Ainur Zhussupbekova, Jos E. Boschker, Jutta Schwarzkopf, David D. O'Regan, Igor Shvets, Kuanysh Zhussupbekov
Summary: Metal-insulator transition materials, such as NbO2, have attracted much attention in recent years for their potential applications in computing and sensing. This study presents a combined theoretical and experimental investigation of the band gap and electronic structure of the insulating phase of NbO2. The results indicate the possible presence of a two-dimensional anisotropic metallic layer at the (100) surface of NbO2.
Article
Materials Science, Multidisciplinary
Alexandru B. Georgescu, Andrew J. Millis, James M. Rondinelli
Summary: We studied the consequences of the approximately trigonal point symmetry of the transition metal site in two-dimensional halides and explained why most of these materials are insulating. Furthermore, we analyzed the possibility of orbital order coupled to lattice modes and discussed the unique electronic states in this class of materials.
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
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
Optics
Andreas Geissler
Summary: This work investigates the properties of the disordered Bose-Hubbard model in two dimensions at different disorder strengths, including the superfluid to Bose-glass transition, the mobility edge of the quasiparticle spectrum, and finite energy localization transitions. The study shows that the level spacing statistics and wave function features of quasiparticle excitations are consistent with a many-body mobility edge.
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.
Article
Chemistry, Physical
Jean-Louis Victor, Manuel Gaudon, Giorgio Salvatori, Olivier Toulemonde, Nicolas Penin, Aline Rougier
Summary: In this study, highly crystallized Fe-doped VO2 powders were successfully synthesized using a carbo-thermal reduction process, with Fe doping impacting the crystal structure and phase transition of VO2. The transition temperature was significantly increased to 134 degrees C, marking a breakthrough in VO2-type thermochromic materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Yongchang Ma, Rui Chen, Yajun Li, Cuimin Lu, Chenguang Zhang
Summary: We propose a model to estimate the energy barrier responsible for the hysteresis of the thermally driven Mott phase transition and validate the model with experimental data. For heating, the resistance in VO2 films exhibits step-like changes, forming multiple nonvolatile states, while no significant changes occur during cooling. The memory ability is attributed to the structure of the metal and insulator domains.
Article
Optics
Xue Chang, Jiang Li, Jian Mu, Chun-Hao Ma, Wanxia Huang, Hong-Fu Zhu, Qiao Liu, Liang-Hui Du, Sen-Cheng Zhong, Zhao-Hui Zhai, Sujit Das, Yen-Lin Huang, Gang-Bei Zhu, Li-Guo Zhu, Qiwu Shi
Summary: This study investigated the THz modulation properties of epitaxial VO2 films on a flexible mica substrate under different uniaxial strains. It was found that the THz modulation depth increases under compressive strain and decreases under tensile strain, and the phase-transition threshold depends on the uniaxial strain. The rate of phase transition temperature change was approximately 6 degrees C/% under temperature-induced phase transition. The optical trigger threshold in laser-induced phase transition decreased by 38.9% under compressive strain but increased by 36.7% under tensile strain. These findings demonstrate the uniaxial strain-induced low-power triggered THz modulation and provide new insights for applying phase transition oxide films in THz flexible electronics.
Article
Physics, Multidisciplinary
I. S. Burmistrov, I. Gornyi, A. D. Mirlin
Summary: This article discusses the formation mechanism of multifractal superconducting state and presents a theory of multifractal superconducting state in thin films. By deriving a modified Usadel equation, the study explores the impact of multifractal-enhanced superconductivity on low-energy physics and reveals strong mesoscopic fluctuations near the spectral gap in the superconducting state.
Article
Physics, Multidisciplinary
I. S. Burmistrov, V. Yu Kachorovskii, M. J. Klug, J. Schmalian
Summary: We develop the theory of anomalous elasticity in two-dimensional flexible materials with orthorhombic crystal symmetry. In the universal region, these materials possess an infinite set of flat phases, which are connected by an emergent continuous symmetry and characterized by a single universal exponent. The anisotropic flat phases are uniquely labeled by the ratio of absolute Poisson's ratios.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Dmitrii Semenok, Ivan A. Troyan, Andrey Sadakov, Di Zhou, Michele Galasso, Alexander G. Kvashnin, Anna G. Ivanova, Ivan A. Kruglov, Alexey A. Bykov, Konstantin Y. Terent'ev, Alexander Cherepakhin, Oleg A. Sobolevskiy, Kirill S. Pervakov, Alexey Yu Seregin, Toni Helm, Tobias Forster, Audrey D. Grockowiak, Stanley W. Tozer, Yuki Nakamoto, Katsuya Shimizu, Vladimir M. Pudalov, Igor S. Lyubutin, Artem R. Oganov
Summary: Polyhydrides are a new class of superconducting materials with high critical parameters that show promise for sensor applications. A study of lanthanum superhydride LaH10, the best known superconductor of this class, is complicated by its large upper critical magnetic field exceeding 120-160 T. The study revealed that replacing La atoms with magnetic Nd atoms significantly suppresses the superconductivity in LaH10, allowing for control of the compound's critical parameters. By using strong pulsed magnetic fields up to 68 T, the study also found that (La,Nd)H-10 exhibits a linear H-C2(T) relationship proportional to |T - T-C|, challenging the applicability of the Werthamer-Helfand-Hohenberg model for polyhydrides. These experimental findings provide new evidence of the isotropic (s-wave) character of conventional electron-phonon pairing in lanthanum decahydride.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
V. M. Pudalov
Summary: The review discusses key experimental results on a multiphase state in two-dimensional electronic systems, focusing on high mobility Si-field effect structures. The study is important for understanding the physical properties of multiphase systems.
Article
Materials Science, Multidisciplinary
I. A. Golovchanskiy, E. Maltsev, I. Shchetinin, V. A. Vlasenko, P. S. Dzhumaev, K. S. Pervakov, O. Emelyanova, A. Yu Tsvetkov, N. N. Abramov, V. M. Pudalov, V. S. Stolyarov
Summary: In this study, we investigated the characteristics of EuSn2As2 single crystals at different temperatures using magnetization measurements, structural characterization, and broad-band ferromagnetic resonance spectroscopy. We observed the conventional collective acoustic resonance mode of the A-type antiferromagnetic canted state in the Eu sub-lattice, as well as its transition to the paramagnetic resonance above the ordering temperature. Additionally, we observed reproducible additional spectral line, which is associated with the magnetism in the Eu sub-lattice.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Multidisciplinary
E. S. Andriaykhina, S. Apostoloff, I. S. Burmistrov
Summary: In this paper, we investigate the repulsion between a Neel-type skyrmion in a chiral ferromagnetic film and a superconducting Pearl vortex caused by stray fields. By considering the non-perturbative effect of the vortex magnetic field on the skyrmion, we observe that the repulsion between them is suppressed as the dimensionless strength of the vortex magnetic field increases. This is manifested in the complex evolution of the free energy with increasing vortex magnetic field and reduction of the equilibrium distance between the centers of the Neel-type skyrmion and Pearl vortex.
Article
Materials Science, Multidisciplinary
P. A. Nosov, D. S. Shapiro, M. Goldstein, I. S. Burmistrov
Summary: Using dissipation to control the creation of nontrivial quantum many-body correlated states is both fundamentally important and practically useful. In this study, we investigated the effect of number conservation in a paradigmatic two-band system with dissipative dynamics. We found that the system exhibits diffusive behavior for particle and hole density modes at intermediate length- and timescales, which can only be excited nonlinearly. We also identified processes that limit this diffusive behavior at the longest length- and timescales, leading to a reaction-diffusion dynamics described by the Fisher-Kolmogorov-Petrovsky-Piskunov equation, causing the designed dark state to become unstable.
Article
Materials Science, Multidisciplinary
Mathieu Lizee, Matthias Stosiek, Igor Burmistrov, Tristan Cren, Christophe Brun
Summary: The interplay between superconductivity and disorder leads to complex phenomena. It is predicted that the peculiar structure of diffusive electronic wave functions can increase the superconducting critical temperature in a certain range of disorder. In this work, a monolayer of lead with a simple band structure and homogeneous structural disorder is used as a model system to study the fluctuations of local density of states (LDOS) and spectral energy gap in a two-dimensional superconductor in the weak-antilocalization regime. The study shows that mesoscopic LDOS fluctuations can be used to locally probe both the elastic and inelastic scattering rates, which are difficult to measure in transport measurements.
Article
Materials Science, Multidisciplinary
M. V. Parfenov, V. Yu. Kachorovskii, I. S. Burmistrov
Summary: We develop a theory of anomalous elasticity in disordered two-dimensional flexible materials. We predict the existence of anisotropic flat phases with power-law scaling of bending rigidity and Young's modulus controlled by a single universal exponent. These flat phases undergo a crumpling transition with an increase of temperature or disorder, and the anisotropic materials crumple into a tubular phase instead of simultaneous crumpling in all directions as in isotropic materials.
Article
Physics, Multidisciplinary
E. S. Andriyakhina, I. S. Burmistrov
Summary: This study investigates the multifractally enhanced superconducting states in two-dimensional systems with the interplay of Anderson localization and electron-electron interactions in the presence of spin-orbit coupling. The energy dependence of the superconducting spectral gap is found to be induced by multifractal correlations. The superconducting transition temperature and spectral gap are determined for different coupling cases. Mesoscopic fluctuations of the local density of states in the superconducting state are also studied, and it is found that spin-orbit coupling reduces the amplitude of fluctuations.
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
S. S. Babkin, I. S. Burmistrov
Summary: The scaling of various local observables at Anderson transition criticality with system size is characterized by a generalized multifractality. We study the generalized multifractality in the presence of interaction in the spin quantum Hall symmetry class. Using the Finkel'stein nonlinear sigma model, we construct pure scaling derivativeless operators and analyze their anomalous dimensions within the two-loop renormalization group analysis. We find that the interaction affects the anomalous dimensions and breaks exact symmetry relations between generalized multifractal exponents known for a noninteracting problem.
Article
Materials Science, Multidisciplinary
I. A. Golovchanskiy, N. N. Abramov, V. A. Vlasenko, K. Pervakov, I. Shchetinin, P. S. Dzhumaev, O. Emelyanova, D. S. Baranov, D. S. Kalashnikov, K. B. Polevoy, V. M. Pudalov, V. S. Stolyarov
Summary: In this paper, we present the results of magnetic resonance spectroscopy on EuFe2As2 single crystals. We observe magnetic resonance responses that can be attributed to antiferromagnetic resonances of the Eu sublattice with orthorhombic crystal structure and different orientations of twin domains relative to the external field. We confirm the validity of the recently proposed spin Hamiltonian with anisotropic Eu-Eu exchange interaction and biquadratic Eu-Fe exchange interaction.
Article
Physics, Multidisciplinary
S. S. Babkin, A. A. Lyublinskaya, I. S. Burmistrov
Summary: The interplay between potential and magnetic disorder in superconductors has been a subject of active research. Using the Usadel equation, the study investigates the effect of a solitary classical magnetic impurity on the local density of states (LDOS) in a dirty superconducting film. The results show that potential disorder broadens the LDOS peak at the Yu-Shiba-Rusinov energy, and this broadening is proportional to the square root of the normal-state spreading resistance of the film. Furthermore, the modification of multiple scattering on the magnetic impurity by intermediate scattering on surrounding potential disorder crucially affects the LDOS profile near the Yu-Shiba-Rusinov energy. A scanning tunneling microscopy tip is also found to mask the Yu-Shiba-Rusinov feature in the LDOS. Additionally, a resonance in the LDOS near a chain of magnetic impurities in the normal region of a dirty superconductor/normal-metal junction is observed, with the energy scale of the resonant peak controlled by the square root of the film resistance per square in the normal state.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
S. S. Evseev, I. S. Burmistrov, K. S. Tikhonov, V. Yu Kachorovskii
Summary: This study focuses on the transport properties of a single electron transistor based on an elastic nanotube. It shows that the transport through the transistor is highly sensitive to elastic disorder near the Euler buckling instability. The built-in curvature leads to the elastic curvature blockade, causing the appearance of a threshold bias voltage in the I-V curve that can be larger than the Coulomb-blockade-induced voltage.
PHYSICAL REVIEW RESEARCH
(2022)
Letter
Physics, Multidisciplinary
M. Stosiek, F. Evers, I. S. Burmistrov
Summary: Fluctuations of the local density of states in weakly disordered superconducting films were studied, with numerical computations and an analytical theory explaining multifractal correlations.
PHYSICAL REVIEW RESEARCH
(2021)
