Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session PP09: V: Strongly Correlated Systems, Including Quantum Fluids and Solids III |
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Sponsoring Units: DCMP Chair: Harrison LaBollita, Arizona State University Room: Virtual Room 9 |
Tuesday, March 21, 2023 9:00AM - 9:12AM |
PP09.00001: Charge order from the local Coulomb repulsion in undoped infinite-layer nickelates Hanghui Chen A charge order with a wave vector q~(1/3,0,0) observed by recent experiments in undoped infinite-layer nickelates, which is very different from that in hole-doped cuprates, demands a theoretical explanation. Here we employ density-functional-theory and dynamical-mean-field-theory calculations and show that a charge ordered state of Ni1+-Ni2+-Ni1+ pattern can have a lower total energy than the uniform paramagnetic state and usual checkerboard antiferromagnetic state in a prototypical nickelate NdNiO2. It arises because of the presence of conduction bands near the Fermi energy. Under a large Coulomb repulsion on the Ni-dx2-y2 orbitals, the electron on one of the Ni-ion is transferred to the conduction bands, which not only enhances the self-doping effect but also drives the electrons on the other two Ni-dx2-y2 orbitals to become more localized. We further show that the stability and stripe pattern of the charge ordered state can be controlled by the charge transfer energy between Ni-dx2-y2 and conduction bands, which is beyond the famous Zaanen-Sawatzky-Allen classification scheme. Our work highlights the multi-band and strongly correlated nature of infinite-layer nickelates and reveals some unique properties of nickelates that are distinct from cuprates. |
Tuesday, March 21, 2023 9:12AM - 9:24AM |
PP09.00002: Universal Perpendicular Conductivity of a Layered Conductor in a Parallel Magnetic Field Andrei G Lebed |
Tuesday, March 21, 2023 9:24AM - 9:36AM |
PP09.00003: Cuprate-Specific Modeling of Pseudogap Collapse Robert S Markiewicz, Bahadur Singh, Christopher A Lane, Arun Bansil We have found that a model of the pseudogap as a short-range antiferromagnetic (AFM) order with topological defects (charged domain walls) can describe many features of the pseudogap, including:
[1] R.S. Markiewicz and A. Bansil, ArXiv:2206.00077. [2] R.S. Markiewicz, B. Singh, C. Lane, and A. Bansil, ArXiv:2105.04546. [3] M. Lizaire et al., PRB104, 014515 (2021). |
Tuesday, March 21, 2023 9:36AM - 9:48AM |
PP09.00004: Creating Long-range Majorana pairs: from Kitaev to XY spin chains Haoting Xu, Jacob A Gordon, Hae-Young Kee We proposed a symmetry-based approach of creating Majorana pairs between left-right symmetric sites in a spin-1/2 Kitaev chain by applying pairing pulse sequence on the central unit cell of the system. We generalized this approach to XY chain and built the connection between Majorana pairs in the fermion representation and Bell pairs in the spin representation. Application of creating Majorana pairs on recently proposed twisted Kitaev cobaltate chain will be also discussed. |
Tuesday, March 21, 2023 9:48AM - 10:00AM |
PP09.00005: Construction and classication of interacting electronic insulators in two dimensions Zhengcheng Gu In the past decade, tremendous efforts have been made towards understanding fermionic symmetry protected topological (FSPT) phases in interacting systems. Nevertheless, for systems with continuum symmetry, e.g., electronic insulators, it is still unclear how to construct an exactly solvable model with a finite dimensional Hilbert space in general. In this paper, we give a lattice model construction and classification for 2D interacting electronic insulators. Based on the physical picture of $mathrm{U(1)}_f$-charge decorations, we illustrate the key idea by considering the well known 2D interacting topological insulator. Then we generalize our construction to an arbitrary 2D interacting electronic insulator with symmetry $G_f=mathrm{U(1)}_f times_{ ho_1,omega_2} G$, where $mathrm{U(1)}_f$ is the charge conservation symmetry and $ ho_1, omega_2$ are additional data which fully characterize the group structure of $G_f$. Finally we study more examples, including the full interacting classification of 2D crystalline topological insulators. |
Tuesday, March 21, 2023 10:00AM - 10:12AM |
PP09.00006: Discovery of Conjoined Charge Density Waves in the Kagome Superconductor CsV3Sb5 Haoxiang Li, Gilberto Fabbris, Ayman H Said, J. P. Sun, Yu-Xiao Jiang, Jia-Xin Yin, Yun-Yi Pai, Sangmoon Yoon, Andrew R Lupini, Christie Nelson, Qiangwei Yin, Chunsheng Gong, Zhijun Tu, Hechang Lei, Jinguang Cheng, Zahid M Hasan, Ziqiang Wang, Binghai Yan, Ronny Thomale, Ho Nyung Lee, Hu Miao The observation of unconventional charge and pairing density waves in a kagome metal CsV3Sb5 is a striking analogy to the cuprate high-temperature superconductivity and the cascade orders in twisted bilayer graphene. While electronic instabilities in CsV3Sb5 are believed to originate from the V 3d-electrons on the kagome plane, the role of Sb 5p-electrons for 3-dimensional orders is largely unexplored. Here, using resonant tender X-ray scattering and high-pressure X-ray scattering, we report a rare realization of conjoined charge density waves (CDWs) in CsV3Sb5, where a 2*2*1 CDW in the kagome sublattice and a Sb 5p-electron assisted 2*2*2 CDW coexist. At ambient pressure, we discover a resonant enhancement on Sb L1-edge (2s->5p) at the 2*2*2 CDW wavevectors. The resonance, however, is absent at the 2*2*1 CDW wavevectors. Applying hydrostatic pressure, CDW transition temperatures are separated, where the 2*2*2 CDW emerges 4 K above the 2*2*1 CDW at 1 GPa. These observations demonstrate that symmetry-breaking phases in CsV3Sb5 go beyond the minimal framework of kagome electronic bands near van Hove filling. |
Tuesday, March 21, 2023 10:12AM - 10:24AM |
PP09.00007: Kondo impurity in an attractive Hubbard bath Zhi-Yuan Wei, Eugene Demler, J. Ignacio Cirac, Tao Shi In this work, we theoretically study the ground-state properties and out-of-equilibrium dynamics when a Kondo impurity couples with 1D and 2D attractive Hubbard bath at half-filling. First, we find the ground state exhibits a singlet-doublet phase transition, and observe the competition between the Kondo correlation and the superconducting (SC) order. In particular, the SC gap on the two sides of the 1D chain exhibit a pi phase shift when the Kondo singlet forms. Then we study the relaxation dynamics of the impurity coupled to a 2D bath, and observe a fast buildup of Kondo correlation near the impurity, with a spin-wave emitted into the bath. The presence of the SC gap leads to an exponential decay of the spin-wave amplitude. Finally, we study the transport between two 1D chains connected by the impurity. By adding a bias voltage, we observe the Josephson effect in the weak-link regime and the ballistic charge transport when the Kondo singlet forms. The charge transport further dramatically influences the bath and the impurity state, leading to rich behaviors such as the dynamical breaking of the Kondo singlet. |
Tuesday, March 21, 2023 10:24AM - 10:36AM |
PP09.00008: Two-channel Kondo effect in coupled interacting helical liquids Sourav Biswas, Sumathi Rao, Alessandro De Martino, Arijit Kundu We study the two-channel Kondo effect in the context of two interacting helical liquids coupled to a spin-$frac12$ magnetic impurity. We show that interactions between the two helical liquids significantly affect the phase diagram and other observable properties. Using a multi-channel Luttinger liquid formalism, we analyze both the Toulouse limit, where an exact solution is available and the weak coupling limit, which can be studied via a perturbative renormalization group approach. We show that contrary to the case of uncoupled liquids, where isotropic couplings lead to non-Fermi liquid behavior and asymmetric couplings lead to Fermi liquid behavior, here the renormalization of the couplings due to the inter-channel interactions allows us to access the non-Fermi liquid fixed point even for asymmetric couplings. By the same token, the Fermi liquid phase can be observed for symmetric couplings. |
Tuesday, March 21, 2023 10:36AM - 10:48AM |
PP09.00009: Magnetic order in a coherent two-dimensional Kondo lattice Fernando De Juan, Miguel M Ugeda, Wen Wan, Rishav Harsh, Sandra Sajan, Paul L Dreher, Ion Errea, Antonella Meninno While mounting evidence exists that transition metal dichalcogenide heterobilayers realize a novel 2D Kondo lattice of effective magnetic moments, their low temperature ground state remains to be established. In this talk I will present our scanning tunneling spectroscopy data for 1T/1H-TaSe2, showing the existence of a split Kondo peak around the Fermi energy, spatially located at the central Ta atom of the charge density wave of the 1T phase. The splitting of this peak further increases with a mangetic field in a non-linear fashion. Aided by ab-initio calculations, I will show that this system is in the limit of small Kondo echange where magnetic order is expected in the Doniach phase diagram. I will then discuss how the non-linear splitting of the peak is also inconsistent with a fully screened Kondo lattice, and originates instead from a ground state with magnetic order, as expected from the strength of the coupling. I will end with a general discussion of the phase diagram of this system. |
Tuesday, March 21, 2023 10:48AM - 11:00AM |
PP09.00010: Possible surface magnetism in the topological Kondo insulator candidate FeSi Yuhang Deng, Yifei Yan, Eric J Lee-Wong, Camilla Moir, Yuankan Fang, M Brian Maple Electrical transport properties of FeSi single crystals, a candidate for a d-electron topological Kondo insulator (TKI), were studied in the phase space of temperature (T), magnetic field (B), and angle (θ) between the electrical current and B. The normalized T-dependent electrical resistance (R) of a successively thinned FeSi single crystal revealed unambiguous evidence for a conducting surface state (CSS) at low T, consistent with previously reported evidence for a CSS based on other measurements [1]. In the CSS, the magnetoresistance (MR) exhibits a hysteresis loop bounded within ± 0.5 T, suggesting two-dimensional magnetic ordering. The hysteretic MR is asymmetric and has an anisotropic character with respect to θ. Further exploration of R(θ) at a fixed field of 9 T reveals a progressive rotation of two-fold rotational symmetry from 2 K to 10 K, then a stabilized two-fold symmetry until at T > 40 K, the anisotropy vanishes, coincident with the disappearance of the CSS. These observations point to a possible magnetically ordered surface state that has been reported in similar systems such as FeSi nanofilms [2] and bulk SmB6 [3]. |
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