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 M29: Strongly Correlated Systems, Including Quantum Fluids and Solids IX |
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Sponsoring Units: DCMP Chair: Wonhee Ko, University of Tennessee, Knoxville Room: Room 221 |
Wednesday, March 8, 2023 8:00AM - 8:12AM |
M29.00001: SU(2) gauge theory of the pseudogap phase in the two-dimensional Hubbard model Pietro Maria M Bonetti, Walter Metzner We present a SU(2) gauge theory of fluctuating magnetic order in the two-dimensional Hubbard model. The theory is based on a fractionalization of electrons in fermionic chargons and bosonic spinons. The chargons undergo Néel or spiral magnetic order below a density dependent transition temperature T∗. Fluctuations of the spin orientation are described by a non-linear sigma model obtained from a gradient expansion of the spinon action. The spin stiffnesses are computed from a renormalization group improved random phase approximation. Our approximations are designed for a moderate, not for a strong Hubbard interaction. The stiffnesses are strongly doping dependent with discontinuities at half-filling and a pronounced electron-hole asymmetry. The spinon fluctuations prevent magnetic long-range order of the electrons at any finite temperature. The phase with magnetic chargon order shares many characteristic features with the pseudogap regime in high-Tc cuprates: a strong reduction of charge carrier density, a spin gap, and Fermi arcs. A substantial fraction of this pseudogap regime exhibits electronic nematicity. |
Wednesday, March 8, 2023 8:12AM - 8:24AM |
M29.00002: Momentum garbling, plasmons and the strange metal continuum in Bi2.1Sr1.9CaCu2O8+x Jin Chen, Xuefei Guo, Christian M Boyd, Ali A Husain, Caitlin S Kengle, Simon L Bettler, Dipanjan Chaudhuri, Farzaneh Hoveyda, Philip W Phillips, Bruno Uchoa, Tai-Chang Chiang, Peter Abbamonte All the physical properties of strange metals can be unified under the marginal Fermi liquid (MFL) phenomenology, which conjectures that the itinerant electrons are coupled to a continuum of charge fluctuations, of unknown origin. Recently [1,2], we reported momentum-resolved electron energy-loss spectroscopy (M-EELS) measurements from the strange metal Bi2.1Sr1.9CaCu2O8+x (Bi-2212,Tc=91K) demonstrating that such a continuum exists. However, these measurements *seem* to contradict IR ellipsometry studies showing that this material exhibits a conventional plasmon at ωp ~ 1 eV. Here, we use Jain and Allen’s model of a layered conductor [3] to make a quantitative comparison between IR data and M-EELS measurements at small momentum, q. We show that the M-EELS data are quantitatively consistent with IR for q<0.02 r.l.u., indicating that both probes see the same plasmon in the small q limit. For q>0.02 r.l.u., we find that this plasmon damps and evolves into an MFL-like continuum. We show that the large q data may be explained by postulating some hidden, elastic multiple scattering mechanism that garbles the momentum of the probe electron. |
Wednesday, March 8, 2023 8:24AM - 8:36AM |
M29.00003: Competing orders in doped Mott-insulator Zhengcheng Gu We study the honeycomb lattice doped Mott-insulator using the fermionic tensor network approach. By examining the ansatz with various unit cells, we discover several different stripe states with different periods that compete strongly with uniform states. At very small doping $delta 0.05$, the ground state is an approximately half-filled stripe ordered state, and the stripe period decreases with increasing hole doping $delta$. Furthermore, the stripe states with the lowest variational energy always display $d_{x^2-y^2}$-wave pairing symmetry. If time permits, I will also mention our unpublished results for square lattice tJ model. |
Wednesday, March 8, 2023 8:36AM - 8:48AM |
M29.00004: De Gennes narrowing in the density fluctuation spectrum of a strange metal Xuefei Guo, Jin Chen, Farzaneh Hoveyda, Simon L Bettler, Dipanjan Chaudhuri, Caitlin S Kengle, John A Schneeloch, Ruidan Zhong, Genda Gu, Philip W Phillips, Tai-Chang Chiang, Peter Abbamonte The origin of the strange metal is a long-standing puzzle that some authors believe could signify Planckian dissipation in a many-body system. We recently reported [1,2] momentum-resolved EELS (M-EELS) experiments from the strange metal Bi2.1Sr1.9CaCu2O8+x indicating that the high-energy (ω > 0.1 eV) charge fluctuation spectrum exhibits a featureless continuum reminiscent of the marginal Fermi liquid (MFL) hypothesis from the late 1980s. However, because of resolution limitations, the low-energy region relevant to transport properties could not be observed. Here we report M-EELS studies of the low-energy region with ω~T using significantly improved momentum and energy resolution. We find that the low-energy charge dynamics exhibit a relaxational form with a momentum-dependent relaxation rate that exhibits a local minimum near the Brillouin zone boundary. This effect, called de Gennes narrowing, is commonly observed in structured liquids where it arises due to steric interactions between rigid objects. This points to the charge transport in strange metals being dominated by charge clusters with a spatial extent of roughly two unit cells. |
Wednesday, March 8, 2023 8:48AM - 9:00AM |
M29.00005: Comparative study of low-lying excitations in cuprate and strontium ruthenate superconductors Peipei Hao, Haoxiang Li, Dushyant M Narayan, Rafal Kurleto, Bryan S Berggren, Andrew G Linn, Amanda Shackelford, Yu Zhang, Hope Whitelock, Gang Cao, Daniel S Dessau High-Tc cuprate superconductors in their normal state are known to have the mysterious strange-metal behavior near optimal doping with strong deviations from the conventional Fermi Liquid form of electronic scattering rates. In particular, these have been described by the marginal-fermi-liquid (MFL) form at optimal doping [1], or more generally the power-law-liquid (PLL) form over all doping levels [2]. Here with careful analysis of the intrinsic line shape of Angle-resolved photoemission (ARPES) dispersion cuts, we report a comparative study of the both ω- and T- dependent scattering rate of (Pb)Bi2Sr2CaCu2O8+δ, La2-xSrxCuO4, as well as the copper-free perovskite superconductor Sr2RuO4. With a unified power-law-liquid form of the imaginary self-energy proposed by Reber et al [2], our fitted parameters reproduce the strange-metal and fermi-liquid-like behavior of the cuprate superconductors and Sr2RuO4, respectively. Surprisingly, we show a much stronger electronic coupling parameter for the scattering in the ruthenates compared to the cuprates, indicating another key difference between these different superconductors. |
Wednesday, March 8, 2023 9:00AM - 9:12AM |
M29.00006: Role of the incommensurate CDW in the nematic response of Sr-doped BaNi2As2 Thomas A Johnson, Sangjun Lee, Xuefei Guo, John C Collini, Stella Sun, Christopher Eckberg, Johnpierre Paglione, Eduardo H Fradkin, Peter Abbamonte Ba1-xSrxNi2As2 (BSNA) is a charge-ordered pnictide superconductor [1,2] that exhibits a six-fold enhancement of superconductivity near a nematic quantum phase transition [3]. This system was also shown to exhibit a diverging nematic susceptibility in elastoresistivity experiments under applied uniaxial strain [3]. This resistive response becomes strain-hysteretic at an incommensurate charge-density-wave (I-CDW) transition, and the hysteresis temperature dependence matches the temperature dependence of I-CDW intensity as seen by x-ray scattering. However the relationship between the CDW and the fluctuating nematic state has not yet been established. To understand the role of the CDW in the nematic response, we performed an x-ray scattering study of the CDW in BSNA x=0.27 under applied uniaxial strain, with an emphasis on the incommensurate CDW present when the nematic response is strongest. We find a large nematic response in the CDW as well, detected as a breaking of the C4 symmetry induced by the applied strain field. The response follows a Curie-Weiss law closely resembling that observed in transport measurements carried out under the same conditions. Our results indicate that the CDW is strongly coupled to the nematic order parameter and may even be the driver of nematic phenomena in this material. |
Wednesday, March 8, 2023 9:12AM - 9:24AM |
M29.00007: Anharmonic multiphonon origin of the valence plasmon in SrTi1−xNbxO3 Caitlin S Kengle, Samantha I Rubeck, Melinda S Rak, Jin Chen, Farzaneh Hoveyda, Ali A Husain, Matteo Mitrano, Simon L Bettler, Alexander Edelman, Peter Littlewood, Tai-Chang Chiang, Fahad Mahmood, Peter Abbamonte SrTiO3 is a quantum paraelectric that, when doped with niobium or oxygen, exhibits superconductivity and a mid-IR optical response reminiscent of that in high temperature superconductors. One of the peculiar properties of doped SrTi1-xNbxO3 is that its plasma frequency is highly temperature dependent, increasing by a factor of three when cooled from 300 K to 20 K. There is presently no understanding of what would lead to such a dramatic change. Here we present momentum-resolved electron energy loss spectroscopy (M-EELS) measurements of the IR response of SrTi1-xNbxO3 (x=0, 0.002, 0.01, 0.014) at nonzero momentum, ranging from the Γ-point to the Brillouin zone boundary. We find that the IR feature previously identified as a plasmon is present in the insulator, SrTiO3, and exhibits the same temperature dependence as in doped materials. We identify this feature as a multiphonon background arising from lattice anharmonicity. Nb doping increases the peak energy and total spectral weight in this background, and draws it to lower momentum where, at sufficient doping, it becomes visible in IR experiments. We conclude that the IR “plasmon” in doped SrTi1-xNbxO3 is not a free-carrier mode, but a composite excitation with mixed electronic and multiphonon character that inherits its anomalous properties from the lattice anharmonicity of the insulator. |
Wednesday, March 8, 2023 9:24AM - 9:36AM |
M29.00008: DFT+DMFT study of lattice dynamics in infinite layer nickelates Sun-Woo Kim, Gheorghe L Pascut, Khandker F Quader, Bartomeu Monserrat Infinite layer nickelates have emerged as unconventional superconductors with possible resemblance to cuprates [1-3]. The low-energy physics of nickelates, which may also provide insights for the cuprates, has been under intense scrutiny. A recent first-principles embedded dynamical mean field theory (eDMFT) study [4] revealed that infinite layer nickelates host a Fermi liquid phase at low temperature and a Curie-Weiss regime at high temperature, which are distinguished by their local magnetic susceptibility associated with screening of Ni-d moments, highlighting the importance of magnetic fluctuations. Here, using first-principles eDMFT, we investigate the lattice dynamics of infinite layer nickelates. We calculate the temperature evolution of the phonon spectrum in order to look for correspondences between the phonon spectra and the electronic phases given in previous reports [4]. Our results highlight the role of magnetic fluctuations in lattice dynamics, providing insights to the recently observed charge density wave [2-3] and thus to the origin of unconventional superconductivity in nickelates. |
Wednesday, March 8, 2023 9:36AM - 9:48AM |
M29.00009: Observation of a Critical Charge Mode in a Strange Metal Yashar Komijani, Hisao Kobayashi, Satoru Nakatsuji, Premala Chandra, Piers Coleman Quantum electronic matter has long been understood in terms of two limiting behaviors of electrons: one of delocalized metallic states, and the other of localized magnetic states. |
Wednesday, March 8, 2023 9:48AM - 10:00AM |
M29.00010: Mechanism of even- and odd-parity density-waves and beyond-Migdal superconductivity in kagome metal AV3Sb5 (A = K, Rb, Cs) Hiroshi Kontani, Rina Tazai, Youichi Yamakawa, Seiichiro Onari Exotic quantum phase transitions in strongly correlated metals have been discovered one after another and found to be universal now. The multistage unconventional density-wave (DW) orders in frustrated kagome metal AV3Sb5 and its interplay with exotic superconductivity attract increasing attention. We find that the time-reversal symmetric star-of-David bond-order originates from sizable intersite attraction due to the quantum interference among paramagnons [1]. This mechanism is important in kagome metals because the geometrical frustration prohibits the freezing of paramagnons. In addition, we uncover that moderate bond-order fluctuations mediate sizable pairing glue, and this mechanism gives rise to both singlet s-wave and triplet p-wave superconductivity [1]. The obtained impurity-induced change in the SC state is consistent with recent experiments [3]. Furthermore, we discovered that the time-reversal broken charge current order is naturally caused by the bond-order fluctuations [4]. Interestingly, the coexistence of the charge-current order and the bond-order gives rise to a novel nematic state [4]. Thus, both the exotic density waves and the superconductivity in geometrically frustrated kagome metals are explained by the quantum interference mechanism. |
Wednesday, March 8, 2023 10:00AM - 10:12AM |
M29.00011: Transport properties of an infinite-layer nickelate Harrison LaBollita, Alexander Hampel, Jonathan Karp, Antia S Botana, Andrew Millis The electronic structure of the rare-earth infinite-layer nickelates is quite similar to that of the layered cuprate superconductors, except that in the rare earth nickelates a rare-earth spectator band that gives rise to a self-doping effect and offers an additional degree of freedom. The effect the rare-earth band has on the physics of these materials is an open question. Here, we investigate the transport properties of an infinite-layer nickelate, NdNiO2 using a combination of density-functional theory and dynamical mean-field theory to understand the effects the spectator band has on the electronic transport. We reveal that the calculated conductivity is orders of magnitude larger than experiment However, upon including scattering processes on the spectator band, the conductivity is significantly reduced. These results offer new insights into the low-energy physics of the infinite-layer nickelates and can be extended to the higher-order layered nickelates. |
Wednesday, March 8, 2023 10:12AM - 10:24AM |
M29.00012: Calculation of the Diamagnetic Susceptibility in a 2D Fermi Liquid Rudolph D Mayrhofer, Andrey V Chubukov We present an investigation of the Landau diamagnetic susceptibility (χL) beyond what is found in traditional thermodynamic arguments. We first consider χL in the case of noninteracting fermions with an isotropic but otherwise arbitrary dispersion at T=0. In this scenario, we find that χL is determined entirely by the fermion dispersion and its derivatives at the Fermi surface. Then, we present a direct diagrammatic analysis of the self energy, Maki-Thompson, and Aslamazov-Larkin diagrams for the current-current correlator, which allows us to obtain corrections to χL up to second order in the Hubbard U. Lastly, to parallel results already established for the spin susceptibility, we search for nonanalytic corrections to χL in both magnetic field H and momentum Q, which will manifest themselves in two dimensions as a |H| and |Q| term, respectively. |
Wednesday, March 8, 2023 10:24AM - 10:36AM |
M29.00013: Effects of dynamic local correlation on the spin susceptibility and superconducting symmetries in Sr2RuO4 Chang-Youn Moon Sr2RuO4 remains as one of most intriguing superconductors with the possibility of highly exotic and unconventional superconductivity, often regarded having px+ipy order parameter with spin-triplet and chiral electron pairing. In the normal state, it is classified as a Hund’s metal where Hund’s coupling plays a central role in the local electronic correlation. |
Wednesday, March 8, 2023 10:36AM - 10:48AM |
M29.00014: Reconciling Hall effect and ARPES in the normal state of cuprate strange metals saumya mukherjee, Steef Smit, sergio B Pierantoni, Arnaud P Nono Tchiomo, Yingkai Huang, Kourosh Shirkoohi, Khadiza Ali, Balasubramanian Thiagarajan, Craig Polley, Nigel E Hussey, Mark Golden The anomalous transport properties of high-Tc cuprates, including its ubiquitous T-linear resistivity, continue to defy understanding, a situation exacerbated by conflicting results. High-field Hall effect measurements on two distinct families – Tl2Ba2CuO6+δ and Pb/La-doped Bi2Sr2CuO6+δ (Bi2201) - found that the effective Hall number exhibits a gradual crossover from p transport-active carriers – a ‘small’ Fermi surface (FS) – to 1+p – a ‘large’ FS – over a broad doping range that extends beyond p* [Nat. Phys. 17 826 (2021)]. By contrast, ARPES measurements reveal a large FS for all p >p*. In the present talk, we describe our search for possible spectroscopic fingerprints of the observed p →1+p crossover within the strange metal regime beyond p* through analysis of normal state ARPES data from the same Bi2201 samples as those reported in the above reference. Specifically, we identify signs of increasing incoherence in the antinodal FS regions as p decreases towards p*. |
Wednesday, March 8, 2023 10:48AM - 11:00AM |
M29.00015: Dynamical mean-field theory for pairing and metal-insulator transitions in the Holstein model away from half-filling Tae-Ho Park, Han-Yong Choi We investigate the pairing and metal-insulator transitions of the Holstein model away from half-filling in infinite dimensions. The Holstein model treats the electron-phonon coupling g on a site and can be mapped to the attractive Hubbard model as the phonon frequency ω0 increases to infinity. Here, we focus on the normal state in which the superconducting order is not allowed, and present the phase diagram within the dynamical mean-field theory in combination with Wilson's numerical renormalization group technique. We present the first order pairing transition between the Fermi liquid metal (M) and a non-Fermi liquid spin gap metal (SGM) of bound pairs and a metal-insulator transition between M and a spin gap bipolaron insulator (BPI) via coexisting regions. Along the phase boundary of the coexisting M and SGM region, a soft phonon mode coupled to the pairing instibility appears and the quasiparticle weight of the M phase vanishes. |
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