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 G29: Strongly Correlated Systems, Including Quantum Fluids and Solids V |
Hide Abstracts |
Sponsoring Units: DCMP Chair: Sanu Mishra, Los alamos National Lab Room: Room 221 |
Tuesday, March 7, 2023 11:30AM - 11:42AM Author not Attending |
G29.00001: Constructing heavy fermions in a NbSe2 heterostructure Xin Huang, Ganguli C Somesh, Jani Sainio, Jose Lado, Peter Liljeroth Heavy fermion systems are a fascinating arena for studying multiple competing electronic orders in a strongly correlated system. Almost all heavy fermion systems are found in three-dimensional bulk compounds with heavy rare-earth elements with f-electrons, while only recent work shows that heavy fermions can emerge in artificially engineered van der Waals heterostructures. |
Tuesday, March 7, 2023 11:42AM - 11:54AM |
G29.00002: Spin Fractionalization in a Kondo Lattice Heterostructure Ethan J Huecker, Yashar Komijani Kondo lattices are materials in which an array of localized magnetic moments (usually f- electrons) interact with a delocalized band of conduction electrons. At low temperatures, a strong quantum entanglement, the so-called Kondo coherence, develops in these systems where each local moment forms a Kondo singlet with its neighboring conduction electrons. It has been suggested that spin-charge separation and spin-fractionalization are at play in Kondo lattices. |
Tuesday, March 7, 2023 11:54AM - 12:06PM |
G29.00003: 2D van der Waals heavy-fermion candidate CeSiI Bo Gyu Jang, Changhoon Lee, Jian-Xin Zhu, Ji Hoon Shim In recent years, two-dimensional (2D) van der Waals (vdW) magnetic and ferroelectric materials have received significant attention. Furthermore, twisted vdW materials have become a new platform to realize exotic matter, such as unconventional superconductivity in twisted bilayer graphene. Therefore, the discovery of new 2D vdW materials can provide an interesting route to explore novel phenomena. One of the missing components in 2D vdW materials is the intrinsic heavy-fermion systems. Here, we investigate 2D vdW heavy-fermion candidates based on the experimentally known compounds by using dynamical mean-field theory calculation combined with density functional theory (DFT+DMFT). Our study reveals that CeSiI is the most promising 2D vdW heavy-fermion candidate. The Kondo resonance state of CeSiI does not change upon exfoliation and can be easily controlled by external perturbation, such as strain and surface doping. Therefore, it can provide an additional degree of freedom to study quantum critical point (QCP), unconventional superconductivity, and emergent phenomena in vdW heterostructures. |
Tuesday, March 7, 2023 12:06PM - 12:18PM |
G29.00004: Entanglement entropy and dynamical Kondo effect near Kondo Destruction Quantum Critical Point Mounica Mahankali, Haoyu Hu, Qimiao Si
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Tuesday, March 7, 2023 12:18PM - 12:30PM |
G29.00005: Existence of Heavy Fermion Behavior in a van der Waals Layered Material Victoria Posey, Simon E Turkel, Michael E Ziebel, Mehdi Rezaee, Aravind Devarakonda, Suheng Xu, Rocco A Vitalone, Ran Jing, Daniel G Chica, Dmitri N Basov, Cory R Dean, Philip Kim, Abhay N Pasupathy, Xavier Roy Heavy fermion materials, where localized magnetic moments strongly interact with itinerant electrons, are hosts to a wide variety of emerging quantum phenomena, such as unconventional superconductivity, quantum criticality, and non-Fermi liquid behavior. One major challenge in the field is reducing the dimensionality of heavy fermion systems, which offers unique opportunities to tune the Coulomb interactions in ways that are not possible in 3D crystals and could provide new insights into the interplay of electron localization, magnetism, and Coulomb screening. This talk will discuss our recent progress in developing and characterizing a new class of two-dimensional (2D) heavy fermion materials. While these materials are conceptually related to traditional intermetallic heavy fermion compounds, their layered van der Waals (vdW) structures allow for mechanical exfoliation down to atomically-thin flakes. We report bulk measurements, including heat capacity, magnetism, electrical transport, and spectroscopy to demonstrate that this compound is the first example of an intrinsic 2D heavy fermion system. In addition, this material displays complex magnetism due to a triangular lattice of antiferromagnetically ordered atoms, producing a magnetically frustrated lattice with an incommensurate propagation vector. By varying the thickness of the material using mechanical exfoliation, this new system offers the unique opportunity to interrogate the fundamental relationship between dimensionality, magnetism, and heavy fermion behavior and offers a new handle for probing quantum criticality. |
Tuesday, March 7, 2023 12:30PM - 12:42PM |
G29.00006: General Periodic Anderson Hamiltonians and their application to Infinite-layer Nickelates Abhishek Som, Nahom Yirga, David K Campbell We study generalized Periodic Anderson Models(PAMs) in two and three spatial dimensions using the functional Renormalization Group(fRG). In two dimensions, we replicate the emergence of d-type superconductivity established in Wu et.al.[1] in a half-filled PAM and further explore the superconducting and magnetic correlations upon doping the system. Continuing this study into three dimensions, we show that dx2-y2 superconductivity arises in a series of 3D ab-initio models of the Nickelates (RNiO2). We study this first by looking into a three dimensional Hubbard model with weak z-hopping and then by exploring a PAM-Hubbard model including the R − dz2 orbital and the interstitial-s as hybridizing conducting bands. |
Tuesday, March 7, 2023 12:42PM - 12:54PM |
G29.00007: 3D-ΔPDF analysis on the structural phase transitions in NaNO2 Puspa Upreti, Matthew J Krogstad, Omar Chmaissem, Stephan Rosenkranz, Raymond Osborn NaNO2 is a ferroelectric with a simple crystal structure that undergoes a phase transition from a ferroelectric body centered orthorhombic (Im2m) phase at room temperature to a paraelectric centrosymmetric orthorhombic (Immm) phase at T* = 436 K. There is an intermediate incommensurately modulated antiferroelectric phase in between ferroelectric and paraelectric phase for a very narrow temperature range of about 2 K at 434 K. The ferroelectric to paraelectric phase transition is modulated by the rearrangement of triangular NO2- and Na+ ions along the crystal b-axis. To probe the short-range order and local correlations behind the process of the proto-typical order-disorder phase transition of this system, x-ray diffuse scattering measurements performed on a single crystal of were transformed into real space producing a three-dimensional pair distribution function using the ‘punch and fill’ method. This 3D-ΔPDF analysis shows unambiguous evidence of temperature-independent local displacements of NO2- ions resulting in its polarization reversal below T*. |
Tuesday, March 7, 2023 12:54PM - 1:06PM |
G29.00008: A mechanism for the strange metal phasein rare-earth intermetallic compounds Jiangfan Wang, Yung-Yeh Chang, Chung-Hou Chung A major mystery in strongly interacting quantum systems is the microscopic origin of the “strange metal” phenomenology, with unconventional metallic behavior that defies Landau’s Fermi liquid framework for ordinary metals. This state is found across a wide range of quantum materials, notably in rare-earth intermetallic compounds at finite temperatures (T) near a magnetic quantum phase transition, and shows a quasilinear-in-temperature resistivity and a logarithmic-in-temperature specific heat coefficient. Recently, an even more enigmatic behavior pointing toward a stable strange metal ground state (phase) was observed in CePd1−xNixAl, a geometrically frustrated Kondo lattice compound. Here, we propose a mechanism for such phenomena driven by the interplay of the gapless fermionic short-ranged antiferromagnetic spin correlations (spinons) and critical bosonic charge (holons) fluctuations near a Kondo breakdown quantum phase transition [1]. Within a dynamical large-N approach to the Kondo–Heisenberg lattice model, the strange metal phase is realized in transport and thermodynamical quantities. It is manifested as a fluctuating Kondo-scattering–stabilized critical (gapless) fermionic spin-liquid metal. It shows ω/T scaling in dynamical electron scattering rate, a signature of quantum criticality. Our results offer a qualitative understanding of the CePd1−xNixAl compound [2] and suggest a possibility of realizing the quantum critical strange metal phase in correlated electron systems in general. |
Tuesday, March 7, 2023 1:06PM - 1:18PM |
G29.00009: Non-Fermi Liquid Phase from Dipole Symmetry Amogh Anakru, Zhen Bi Multipole symmetries and conservation laws are relatively new concepts in condensed matter, with their microscopic consequences and symmetry-broken phases being the subject of ongoing research. Motivated by the recent study of bosonic systems with dipolar symmetry [1], we consider fermions on a 2-D square lattice with both charge and dipole moment conservation. The model is intrinsically interacting due to the dipolar symmetry, and we explore the phase diagram of the model using mean-field methods. In particular, we find a phase where the dipolar symmetry is spontaneously broken. In this phase, fermions acquire dispersion from the condensation of dipole moments and the low-energy theory is that of a Fermi surface coupled to Goldstone modes of the broken symmetry. Moreover, we notice that the Goldstone-Fermion coupling is non-vanishing at low momentum, which gives rise to a non-Fermi liquid state at low energy in the dipole condensed phase. |
Tuesday, March 7, 2023 1:18PM - 1:30PM |
G29.00010: Evidence for quasi-Fermi liquid behavior in one-dimensional interacting quantum systems Joshua Baktay We present numerical evidence for a new paradigm in one-dimensional interacting fermion systems, whose phenomenology has traits of both Luttinger liquids and Fermi liquids. This new state, dubbed a quasi-Fermi liquid, was previously theoretically predicted to possess a discontinuity in its fermion occupation number at the Fermi energy while lacking the associated Landau quasiparticles. Such a state is realized in a one-dimensional spinless fermion Hamiltonian by fine-tuning the interactions to a regime where they become irrelevant in the renormalization group sense. We show, using uniform infinite matrix products states and finite-entanglement scaling analysis, that the system's ground state has a Luttinger parameter K = 1 and a discontinuous jump in the fermion occupation number. We support the characterization with calculations of the photoemission spectra. These results indicate that the quasi-Fermi liquid paradigm can be realized beyond the low-energy perturbative realm. |
Tuesday, March 7, 2023 1:30PM - 1:42PM |
G29.00011: Energy and Momentum Relaxation in the Normal State of LSCO Thin Films David Barbalas, Dipanjan Chaudhuri, Jiahao Liang, Ralph Romero, Fahad Mahmood, Anaelle Legros, Xi He, Ivan Bozovic, N. Peter Armitage The strange metal regime of the cuprate superconductors characterized by T-linear resistivity above Tc has been found to be adjacent to the pseudogap and Fermi liquid phases, at the intersection of bad metallic and normal Fermi-liquid like metallic behavior. In our work, we explore the nonlinear electrodynamic response of LSCO thin films from the mildly underdoped to extremely overdoped region using THz-pump, THz-probe spectroscopy. While there is a large nonlinear response in the superconducting state due to injection of quasiparticles via breaking Cooper pairs, we find that the nonlinear response persists deep into the normal state up to 120 K over the whole range of superconducting samples. This large nonlinearity is quite unlike normal metals. We use this nonlinearity as a tool to measure the energy relaxation rate of these materials via all THz range pump-probe spectroscopy. The energy relaxation time is a fundamental time-scale that cannot be measured by conventional linear response spectroscopic methods. A comparison of the energy relaxation rate to the current relaxation rate (measured with conventional THz spectroscopy) is particularly illuminating. We find across the doping range studied that the energy relaxation rate is much smaller than the momentum relaxation rate by a factor of 10-20x. This observation deviates strongly from expectations for Fermi-liquid behavior. |
Tuesday, March 7, 2023 1:42PM - 1:54PM |
G29.00012: Kondo destruction and SDWr quantum criticality in heavy fermion metals Lei Chen, Ang Cai, Haoyu Hu, Qimiao Si Two types of quantum criticality have been extensively discussed in canonical heavy fermion metals [1]. The first type is the Kondo destruction, corresponding to a beyond-Landau quantum critical point, in which quasiparticles are lost everywhere on the Fermi surface [2]. The second type corresponds to a fluctuating spin-density-wave (SDW), which is within the Landau framework of order-parameter fluctuations. Here [3], using the EDMFT and CTQMC method, we systematically show that even for the second type, the upper cutoff of the Landau quantum criticality, E_{cr}, is considerably smaller than the bare Kondo scale, due to the dynamical competition between the RKKY and Kondo interactions. Thus, a large dynamical range exists for Kondo-destruction quantum critical fluctuations above E_{cr} [3]. Accordingly, we propose the notion of SDW_r quantum criticality for heavy fermion metals. We explain how our results provide long-overdue understanding of the quantum critical behavior observed in CeCu2Si2 and related heavy fermion systems. |
Tuesday, March 7, 2023 1:54PM - 2:06PM Author not Attending |
G29.00013: Thermalization of Non-Fermi Liquids Luca V Delacretaz, Dam T Son |
Tuesday, March 7, 2023 2:06PM - 2:18PM |
G29.00014: Linear resistivity in κ-(BEDT-TTF)2Cu(NCS)2 Chaima Essghaier, Pascale Auban Senzier, Claude Pasquier Many materials show strong electronic correlations where superconductivity competes with insulating states. Examples include cuprates, pnictides or heavy fermions as well as the low dimensional molecular compounds that are the subject of this presentation.
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Tuesday, March 7, 2023 2:18PM - 2:30PM |
G29.00015: Electron-phonon and spin-orbit coupling in early-transition metal conductive oxides Josep Fontcuberta, Gyanendra Singh, Mathieu Mirjolet, Ferran Macià, Gervasi Herranz Metallic oxides are commonly viewed as examples of electron-correlated systems, where the electron-electron interactions within narrow 3d bands govern electrical and optical properties. Among other consequences, electron effective masses are commonly found to be much enhanced compared to bare electrons and attributed to the mentioned electron correlations. However, we shall report that in some early transition metal oxides, such as SrVO3, experimental facts –including transport and electron spectroscopic data- appear to suggest that electron-phonon coupling plays a major role on the effective mass enhancement, largely contributing to the red shift of the plasma frequency. Accordingly, plasmon excitations in these materials, would be better described as polaronic-plasmons rather than the ordinary electron-plasmons. On the other hand, in presence of large charge-lattice coupling, it can be envisaged that spin-orbit coupling could also lead to other emerging properties. In particular, we show that SrVO3, in spite of containing light 3d1-(V4+) cations, effectively absorbs spin currents from neighboring magnetic layers, suggesting that early transition metallic oxides may be a suitable alternative to the common heavy (and noble) metals currently used in some spintronic devices. |
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