Article
Physics, Multidisciplinary
J. Choi, Q. Wang, S. Joehr, N. B. Christensen, J. Kuespert, D. Bucher, D. Biscette, M. H. Fischer, M. Huecker, T. Kurosawa, N. Momono, M. Oda, O. Ivashko, M. Zimmermann, M. Janoschek, J. Chang
Summary: In the cuprates, the unidirectional nature of the CDW in La1.88Sr0.12CuO4 was established using x-ray diffraction with uniaxial pressure. A significant enhancement of the CDW amplitude was found when homogeneous superconductivity was partially suppressed by a magnetic field.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
K. von Arx, Qisi Wang, S. Mustafi, D. G. Mazzone, M. Horio, D. John Mukkattukavil, E. Pomjakushina, S. Pyon, T. Takayama, H. Takagi, T. Kurosawa, N. Momono, M. Oda, N. B. Brookes, D. Betto, W. Zhang, T. C. Asmara, Y. Tseng, T. Schmitt, Y. Sassa, J. Chang
Summary: In high-temperature cuprate superconductors, the stripe order evolution across optimal doping remains controversial. This study investigates weak charge correlations in La2-xSrxCuO4 and La1.8-xEu0.2SrxCuO4 using resonant inelastic X-ray scattering. The results reveal temperature-dependent long-range stripe order only below optimal doping, while temperature-independent short-range correlations exist at higher doping, suggesting an unresolved electron-phonon coupling origin.
NPJ QUANTUM MATERIALS
(2023)
Article
Physics, Multidisciplinary
A. von Hoegen, M. Fechner, M. Foerst, N. Taherian, E. Rowe, A. Ribak, J. Porras, B. Keimer, M. Michael, E. Demler, A. Cavalleri
Summary: In this study, it is shown that certain lattice vibrations in cuprate high-T-c superconductors can induce transient terahertz reflectivity features suggestive of nonequilibrium superconductivity above the critical temperature. Time-resolved measurements reveal a three-order-of-magnitude amplification of a 2.5-THz electronic mode in driven YBa2Cu3O6+x. Theoretical analysis explains these observations by proposing an amplification mechanism for finite-momentum Josephson plasma polaritons. The study also emphasizes the significance of nonlinear mode mixing in amplifying fluctuating modes above the transition temperature in a wide range of materials.
Article
Materials Science, Multidisciplinary
Haiyu Lu, Makoto Hashimoto, Su-Di Chen, Shigeyuki Ishida, Dongjoon Song, Hiroshi Eisaki, Abhishek Nag, Mirian Garcia-Fernandez, Riccardo Arpaia, Giacomo Ghiringhelli, Lucio Braicovich, Jan Zaanen, Brian Moritz, Kurt Kummer, Nicholas B. Brookes, Ke-Jin Zhou, Zhi-Xun Shen, Thomas P. Devereaux, Wei-Sheng Lee
Summary: This study investigates the interplay between charge order (CO) and superconductivity using resonant inelastic x-ray scattering (RIXS) in the Bi-2212 cuprate phase diagram. The results show that as doping increases, the CO wave vector decreases, and the correlation length becomes shorter. CO excitations in the superconducting state are strongest at the critical doping p(c), consistent with behavior at a charge order quantum critical point. Interestingly, p(c) appears to be near optimal doping, where the superconducting transition temperature is maximal.
Article
Multidisciplinary Sciences
Su-Di Chen, Makoto Hashimoto, Yu He, Dongjoon Song, Jun-Feng He, Ying-Fei Li, Shigeyuki Ishida, Hiroshi Eisaki, Jan Zaanen, Thomas P. Devereaux, Dung-Hai Lee, Dong-Hui Lu, Zhi-Xun Shen
Summary: Scientists have resolved the spectroscopic singularity associated with the high-Tc superconducting transition in cuprates using high-precision angle-resolved photoemission spectroscopy. They discovered that the anomaly is caused by the singular growth of in-gap spectral intensity and observed that the temperature evolution of this intensity is highly anisotropic in momentum space.
Article
Multidisciplinary Sciences
Naman K. Gupta, Christopher McMahon, Ronny Sutarto, Tianyu Shi, Rantong Gong, Haofei I. Wei, Kyle M. Shen, Feizhou He, Qianli Ma, Mirela Dragomir, Bruce D. Gaulin, David G. Hawthorn
Summary: Recent studies have shown a correlation between electronic nematicity and the pseudogap phase in cuprate superconductors. By altering doping levels or temperature, significant changes in electronic nematicity can be observed in relation to the pseudogap phase.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Multidisciplinary
Ryan M. McMullen, Michael C. Krygier, John R. Torczynski, Michael A. Gallis
Summary: This study compares the Navier-Stokes equations with molecular-gas-dynamics simulations and finds that the equations fail to describe the dissipation range of turbulent gas flows due to the neglect of thermal fluctuations. The research also reveals that the spectra in molecular-gas-dynamics simulations exhibit quadratic growth with wave number in the dissipation range, in contrast to the exponential decay in the Navier-Stokes spectra. Furthermore, the transition to quadratic growth occurs at length scales larger than the gas molecular mean free path.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Yingying Peng, Leonardo Martinelli, Qizhi Li, Matteo Rossi, Matteo Mitrano, Riccardo Arpaia, Marco Moretti Sala, Qiang Gao, Xuefei Guo, Gabriella Maria De Luca, Andrew Walters, Abhishek Nag, Andi Barbour, Genda Gu, Jonathan Pelliciari, Nicholas B. Brookes, Peter Abbamonte, Marco Salluzzo, Xingjiang Zhou, Ke-Jin Zhou, Valentina Bisogni, Lucio Braicovich, Steven Johnston, Giacomo Ghiringhelli
Summary: This study investigates the electron-phonon coupling in high-Tc superconducting cuprates using resonant inelastic x-ray scattering. By comparing the results from two cuprate families at different doping levels, it is found that the EPC strength decreases with doping and shows a nonmonotonic trend at smaller momenta, which is attributed to the screening effect of charge carriers.
Article
Multidisciplinary Sciences
Hoyoung Jang, Sanghoon Song, Takumi Kihara, Yijin Liu, Sang-Jun Lee, Sang-Youn Park, Minseok Kim, Hyeong-Do Kim, Giacomo Coslovich, Suguru Nakata, Yuya Kubota, Ichiro Inoue, Kenji Tamasaku, Makina Yabashi, Heemin Lee, Changyong Song, Hiroyuki Nojiri, Bernhard Keimer, Chi-Chang Kao, Jun-Sik Lee
Summary: Researchers have found that the photoinduced normal state of high-T-c cuprates exhibits similar characteristics to those in equilibrium conditions under magnetic fields, such as the competition between superconductivity and charge density waves.
Article
Materials Science, Multidisciplinary
I. A. Goremykin, A. A. Katanin
Summary: We propose a dynamical mean-field theory approach for the study of spiral magnetic order, which includes impurity solvers for the diagonal local Green's function. By considering nonuniform dynamic magnetic susceptibilities in a local coordinate frame, we describe the evolution of magnetic order in the t-t' Hubbard model. We find that with doping, the antiferromagnetic order changes to an incommensurate one and then to the paramagnetic phase.
Article
Multidisciplinary Sciences
Chao Yang, Haiwen Liu, Yi Liu, Jiandong Wang, Dong Qiu, Sishuang Wang, Yang Wang, Qianmei He, Xiuli Li, Peng Li, Yue Tang, Jian Wang, X. C. Xie, James M. Valles, Jie Xiong, Yanrong Li
Summary: Fermi liquid theory is the basis for understanding metals, but some quantum materials exhibit strange-metallic behavior that deviates from the traditional theory. This study shows that strange-metal properties also exist in a bosonic system, suggesting the presence of a fundamental principle governing transport beyond particle statistics.
Article
Physics, Multidisciplinary
Riccardo Arpaia, Giacomo Ghiringhelli
Summary: The presence of different electronic orders, especially charge density waves, in cuprates suggests their key role in revealing the mysteries of these materials. Recent experiments have shown that very short-ranged charge modulations exist across a wider region of the phase diagram, coexisting with CDW at lower temperatures and persisting up to temperatures well above the pseudogap opening.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Mechanics
Miguel Angel Lopez-Castano, Alejandro Marquez Seco, Alicia Marquez Seco, Alvaro Rodriguez-Rivas, Francisco Vega Reyes
Summary: We studied the velocity autocorrelations in confined two-dimensional active rotors (disks). Small scale oscillations were observed in both rotational and translational velocity autocorrelations, with the characteristic frequency increasing as rotational activity increased. At stronger particle rotational activity, large scale particle spin fluctuations tended to vanish, while small oscillations around zero persisted, and spins remained predominantly and strongly anti-correlated at longer times. For weaker rotational activity, spin fluctuations became larger, and angular velocities remained de-correlated at longer times. The autocorrelation oscillations were found to be related to the rotational activity and indicative of the emergence of chirality in the dynamics of the particulate system.
Article
Physics, Multidisciplinary
Yanting Li, Bixia Gao, Qiyu Wang, Juan Zhang, Qiaoni Chen
Summary: The competition between the RKKY interaction and the Kondo effect in heavy fermion materials was studied, revealing that the onsite Coulomb repulsion between localized electrons and conduction electrons plays a significant role in the physical phenomena. By investigating the extended periodic Anderson model under symmetric conditions at half filling, different phases and phase transitions were found, with a coexistence region between them. As the hybridization strength increases, the Kondo effect becomes stronger, leading to the appearance of the paramagnetic phase between the antiferromagnetic and charge order phases.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
H. Murayama, K. Ishida, R. Kurihara, T. Ono, Y. Sato, Y. Kasahara, H. Watanabe, Y. Yanase, G. Cao, Y. Mizukami, T. Shibauchi, Y. Matsuda, S. Kasahara
Summary: Experimental observations in a spin-orbit coupled Mott insulator have unveiled a hidden-order phase with broken inversion and time-reversal symmetries, characterized by in-plane magnetic anisotropy. This odd-parity order parameter differs from previously reported even-parity nematic transitions.
Article
Multidisciplinary Sciences
S. Wandel, F. Boschini, E. H. da Silva Neto, L. Shen, M. X. Na, S. Zohar, Y. Wang, S. B. Welch, M. H. Seaberg, J. D. Koralek, G. L. Dakovski, W. Hettel, M-F Lin, S. P. Moeller, W. F. Schlotter, A. H. Reid, M. P. Minitti, T. Boyle, F. He, R. Sutarto, R. Liang, D. Bonn, W. Hardy, R. A. Kaindl, D. G. Hawthorn, J-S Lee, A. F. Kemper, A. Damascelli, C. Giannetti, J. J. Turner, G. Coslovich
Summary: In this study, the transient evolution of charge density wave (CDW) correlations in cuprate superconductors after the quench of superconductivity was tracked using ultrafast resonant soft x-ray scattering. The results showed a nonthermal response of CDW order characterized by a doubling of the correlation length within approximately 1 picosecond of the superconducting quench. These findings suggest that the interaction between superconductivity and CDWs manifests inhomogeneously through disruption of spatial coherence.
Article
Multidisciplinary Sciences
Zheng Yan, Rhine Samajdar, Yan-Cheng Wang, Subir Sachdev, Zi Yang Meng
Summary: In this study, a large-scale quantum Monte Carlo simulation is performed on an extended triangular lattice quantum dimer model with terms in the Hamiltonian that annihilate and create single dimers. The results show the existence of distinct odd and even Z(2) spin liquids, along with several phases with no topological order. Additionally, dynamic spectra of these phases are presented, with implications for experiments on Rydberg atoms.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Rhine Samajdar, Darshan G. Joshi, Yanting Teng, Subir Sachdev
Summary: Strongly interacting arrays of Rydberg atoms provide versatile platforms for exploring exotic many-body phases and dynamics of correlated quantum systems. Motivated by recent experimental advances, we show that the combination of Rydberg interactions and appropriate lattice geometries naturally leads to emergent Z(2) gauge theories endowed with matter fields. We also discuss the natures of the fractionalized excitations of these Z(2) spin liquid states using both fermionic and bosonic parton theories and illustrate their rich interplay with proximate solid phases.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Haoyu Guo, Darshan G. Joshi, Subir Sachdev
Summary: In this study, we calculate the thermal Hall coefficient of phonons scattering off a defect with multiple energy levels. Our results show that the perturbative contribution in the phonon-defect coupling is proportional to the phonon lifetime and has a side-jump interpretation. We also find that the thermal Hall angle is independent of the phonon lifetime.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Zheng Yan, Yan-Cheng Wang, Rhine Samajdar, Subir Sachdev, Zi Yang Meng
Summary: We perform large-scale quantum Monte Carlo simulations on a realistic Hamiltonian of kagome-lattice Rydberg atom arrays and analyze their static and dynamic properties. We find emergent glassy behavior in a region of parameter space between two valence bond solid phases. The extent and phase transitions of this glassy phase as well as its slow time dynamics and experimental considerations for its detection are discussed. Our proposal opens up a new route to studying real-time glassy phenomena and highlights the potential for quantum simulation of distinct phases of quantum matter.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Maine Christos, Zhu-Xi Luo, Henry Shackleton, Ya-Hui Zhang, Mathias S. Scheurer, Subir Sachdev
Summary: Confined quantum spin liquid in hole-doped cuprates is described in this article. The spin liquid is described by a SU(2) gauge theory of Nf = 2 massless Dirac fermions. Confinement is argued to occur via the Higgs condensation of bosonic chargons carrying fundamental SU(2) gauge charges. At half-filling, there is a low-energy theory of the Higgs sector with Nb=2 relativistic bosons and an emergent SO(5)b global symmetry. A conformal SU(2) gauge theory with Nf=2 fundamental fermions, Nb=2 fundamental bosons, and a SO(5)f x SO(5)b global symmetry is proposed, which describes a deconfined quantum critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Physics, Multidisciplinary
Xiaoyang Huang, Subir Sachdev, Andrew Lucas
Summary: Using holographic duality, this paper presents a controlled theory of quantum critical points without quasiparticles at finite disorder and finite charge density. The fixed points are obtained by perturbing a disorder-free quantum critical point with relevant disorder, and the critical exponents and thermoelectric transport coefficients are calculated.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Aavishkar A. Patel, Haoyu Guo, Ilya Esterlis, Subir Sachdev
Summary: This study considers the coupling of two-dimensional metals with quantum critical scalars and finds that these metals exhibit strange metal behavior at low temperatures, characterized by a linear resistivity and a specific heat that follows a T ln(1/T) relationship. The study also provides an explanation for the theoretical bound on the transport scattering time.
Article
Materials Science, Multidisciplinary
Alexander Nikolaenko, Jonas von Milczewski, Darshan G. Joshi, Subir Sachdev
Summary: The pseudogap metal phase of hole-doped cuprates can be described by small Fermi surfaces of electronlike quasiparticles enclosing a volume violating the Luttinger relation. The existence of additional fractionalized excitations, considered as fractionalized remnants of the paramagnon, is required for this violation. A gauge theory is presented for the bosonic spinons, a Higgs field, and an ancilla layer of fermions coupled to the original electrons, fractionalizing the paramagnon into the spin liquid described by C P 1 U(1) gauge theory. It displays conventional phases, including the large Fermi surface Fermi liquid and phases with spin density wave order, along with the small Fermi surface pseudogap metal.
Article
Physics, Multidisciplinary
Chenyuan Li, Subir Sachdev, Darshan G. Joshi
Summary: We investigated models of electrons in the Sachdev-Ye-Kitaev class with random and all-to-all electron hopping, electron spin exchange, and Cooper-pair hopping. An attractive on-site interaction between electrons results in superconductivity at low temperatures. Depending on the relative strengths of the hopping and spin exchange, the normal state at the critical temperature can be either a Fermi-liquid or a non-Fermi liquid. We conducted a large-M study of the normal state to superconductor phase transition and described the transition temperature, the superconducting order parameter, and the electron spectral functions. We compared the effects of different normal states on the superconductivity emergence.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Cole Miles, Rhine Samajdar, Sepehr Ebadi, Tout T. Wang, Hannes Pichler, Subir Sachdev, Mikhail D. Lukin, Markus Greiner, Kilian Q. Weinberger, Eun-Ah Kim
Summary: Machine learning is a promising approach for studying complex phenomena with rich datasets. This study introduces a hybrid-correlation convolutional neural network (hybrid-CCNN) and applies it to experimental data generated by a programmable quantum simulator. The hybrid-CCNN is able to discover and identify new quantum phases on square lattices with programmable interactions. This combination of programmable quantum simulators with machine learning provides a powerful tool for exploring correlated quantum states of matter.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Haoyu Guo, Aavishkar A. Patel, Ilya Esterlis, Subir Sachdev
Summary: This study describes the coupling of Fermi surface with a scalar field using a 1/N expansion, computes the conductivity of the system in two spatial dimensions for a critical scalar, and finds a Drude contribution as well as the vanishing coefficient of the proposed 1/omega(2/3) contribution to the optical conductivity at frequency omega for a convex Fermi surface. The study also investigates the influence of impurity scattering on the fermions and observes that while the self-energy resembles a marginal Fermi liquid, the resistivity and optical conductivity behave like a Fermi liquid.
Article
Materials Science, Multidisciplinary
Aman Kumar, Subir Sachdev, Vikram Tripathi
Summary: Motivated by the pseudogap-Fermi liquid transition in doped Mott insulators, this study examines the excitations of a t-J model with random and all-to-all hopping and exchange. It is found that at low dopings, magnons and emergent JW fermions are stable and well-defined, while Landau quasiparticles are unstable. Upon crossing a critical doping value around pc = 1/3, the stabilities of Landau quasiparticles and the other two are interchanged, and near the critical doping, all these quasiparticles are ill defined. The critical point is thus associated with a localization transition in the many-body Hilbert space.
Article
Materials Science, Multidisciplinary
Marcin Kalinowski, Rhine Samajdar, Roger G. Melko, Mikhail D. Lukin, Subir Sachdel, Soonwon Choi
Summary: Motivated by recent experimental realizations of exotic phases of matter on programmable quantum simulators, this study investigates quantum phase transitions in a Rydberg atom array on a square lattice with both open and periodic boundary conditions. The researchers identify several types of phase transitions and provide analytical understanding of their nature, using the framework of Landau-Ginzburg-Wilson theory. Interestingly, they also find that the boundary itself undergoes a second-order quantum phase transition under open boundary conditions.
Article
Materials Science, Multidisciplinary
Eric Mascot, Alexander Nikolaenko, Maria Tikhanovskaya, Ya-Hui Zhang, Dirk K. Morr, Subir Sachdev
Summary: We examined the spectral properties of the intermediate temperature pseudogap metal phase of the cuprates proposed in a recent theory. The theory suggests that this phase can be derived from the paramagnon theory of nearly antiferromagnetic metals by fractionalizing the paramagnon into two hidden layers of S = 1/2 spins. The first hidden layer hybridizes with the electrons, similar to a Kondo lattice heavy Fermi liquid, while the second hidden layer forms a spin liquid with fractionalized spinon excitations. By computing the imaginary part of the electronic self-energy induced by the spinon excitations, we found that the energy and momentum dependence of the photoemission spectrum across the Brillouin zone matches well with experimental observations in (Pb-x, Bi2-x)(LaySr2-y)CuO6+delta and (Bi, Pb)(2)Sr2CaCu2O8+delta samples by He et al. [Science 331, 1579 (2011)] and Chen et al. [Science 366, 1099 (2019)] respectively.
