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 F30: Strongly Correlated Systems, Including Quantum Fluids and Solids IV |
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Sponsoring Units: DCMP Chair: JONAS BROWN, University of California--Riverside Room: Room 222/223 |
Tuesday, March 7, 2023 8:00AM - 8:12AM |
F30.00001: Energy relaxation enhancement in a quantized two-dimensional interacting carrier system in a magnetic field. Elina Klysheva, Dmitrii Kruglov, Andrei B Kogan, Chieh-Wen Liu, Xuan Gao, Loren N Pfeiffer, Kenneth W West We study low-temperature energy relaxation between a system of low-density holes with a high interaction parameter rs (>20) and the host GaAs/AlGaAs quantum well lattice. Compared to the B=0 case, we find a significant enhancement of the energy relaxation rate when the system is tuned to a dissipative state between adjacent Quantum Hall plateaus. We find qualitatively similar behavior in samples with 2DES grown on [311] and [001] crystallographic planes. We also find a lower-than-expected exponent in the temperature dependence of the power flow between 2DES and the host, compare the results to available predictions and discuss the 2DES density dependence of the observed effect. |
Tuesday, March 7, 2023 8:12AM - 8:24AM |
F30.00002: Multi-channel fluctuating field approach to competing instabilities in interacting electronic systems Erik Linnér Systems with strong electronic Coulomb correlations often display rich phase diagrams exhibiting different ordered phases involving spin, charge, or orbital degrees of freedom. The theoretical description of the interplay of the corresponding collective fluctuations giving rise to this phenomenology remains however a tremendous challenge. Here, we introduce a multi-channel extension of the recently developed fluctuating field approach to competing collective fluctuations in correlated electron systems. The method is based on a variational optimization of a trial action that explicitly contains the order parameters of the leading fluctuation channels. It gives direct access to the free energy of the system, facilitating the distinction between stable and meta-stable phases of the system. We apply our approach to the extended Hubbard model in the weak to intermediate coupling regime where we find it to capture the interplay of competing charge density wave and antiferromagnetic fluctuations with qualitative agreement with more computationally expensive methods. The multi-channel fluctuation field approach thus offers a promising new route for a numerically cheap treatment of the interplay between collective fluctuations in large systems. |
Tuesday, March 7, 2023 8:24AM - 8:36AM |
F30.00003: Fermi Surface Symmetric Mass Generation Da-Chuan Lu, Meng Zeng, Juven Wang, Yi-Zhuang You Symmetric mass generation is a novel mechanism to give gapless fermions a mass gap by non-perturbative interaction effect without spontaneously generating any fermion bilinear condensation. So far, the discussion of symmetric mass generation has been limited to Dirac/Weyl/Majorana fermions with zero Fermi volume in the free fermion limit. In this work, we generalize the notion of symmetric mass generation to Fermi liquid with a finite Fermi volume and discuss how to trivially gap out the Fermi surface(s) by interactions without breaking the protecting U(1) loop group symmetry. We provide examples of Fermi surface symmetric mass generation in both (1+1)D and (2+1)D Fermi liquid systems without Fermi surface anomaly. However, the U(1) loop group symmetry in these cases is still restrictive enough to rule out all possible fermion bilinear gapping terms, such that a non-trivial interaction mechanism is the only way out. As a side product, our (1+1)D model provides a lattice regularization for the 3-4-5-0 chiral Fermi model by utilizing lattice translation symmetry as an emergent U(1) symmetry at low energy. This opens up the opportunity for more efficient numerical simulations of chiral fermions at low dimensions. |
Tuesday, March 7, 2023 8:36AM - 8:48AM |
F30.00004: Observing a bath induced phase transition via entropy detection in quantum dots Zhanyu Ma, Cheolhee Han, Eran Sela, Yigal Meir Entropy measurements based on charge detection are becoming a powerful probe of mesoscopic systems. It is thus of great practical interest to study the backaction of the detector, typically a quantum point contact (QPC), in such experiments. In this work, we demonstrate the possibility that the measured entropy is strongly influenced by the backaction of the detector. More precisely, we show the detector could act as a bath and induce a dissipative quantum phase transition, in which the entropy of the total system is sharply modified across the transition point. We construct a simple and yet general theory for such phase transition, and most importantly, we show the backaction of the QPC detector is encoded in one single parameter, the phase shift, which can be directly read out from the conductance. Using numerical renormalization group (NRG) we predict the system's phase diagram at finite temperature and finite coupling. This serves as a guide of experiments to observe bath induced quantum phase transitions through entropy measurements, and thus understand the role of the charge detector as an integral part of the system. |
Tuesday, March 7, 2023 8:48AM - 9:00AM |
F30.00005: Bound States of a Polaron, Bi-polaron and multiple polarons. YURIY MALOZOVSKY Bi-polaron and multiple polarons have been considered using two particle and many-particles Green function method. The single polaron Green's function has been described in terms of the Dyson equation and has been incorporated into the Bi-polaron and multi-polarons Green functions. The polaron exact self-energy part incorporating three-point vertex function and describing the interaction of an electron with phonons (optical and /or acoustic) as shown include two terms. The first term stands for the self-consistent one–phonon contribution which in fact represents the Tamm-Dancoff approximation. The second term in the polaron self-energy describes the polaron bound states and can be written in terms of the effective scattering amplitude as shown. This approach allows to describe the polaron bound states similar to the two particles bound by the Coulomb potential. Bi-polaron bound states are described by the three sets: bi-polaron set, and two single polarons sets. Tri-polaron and quad-polaron have also been considered. A polaron, bi-polaron are considered due to the interaction of an electron with optical phonons in 3D and in 2D case with acoustic phonons where bound states exist even in the case of the weak electron-phonon coupling. The Bose condensation of bi-polaron and/or multi-polaron gas in a layered 2D system with interlayer coupling is discussed. |
Tuesday, March 7, 2023 9:00AM - 9:12AM |
F30.00006: Tuning orbital-selective phase transitions in a two-dimensional Hund's correlated system Eun Kyo Ko, Sungsoo Hahn, Changhee Sohn, Sangmin Lee, Seung-Sup B. Lee, Byungmin Sohn, Jeong Rae Kim, Jaeseok Son, Jeongkeun Song, Youngdo Kim, Donghan Kim, Miyoung Kim, Choong Hyun Kim, Changyoung Kim, Tae Won Noh For describing the novel quantum phases in multi-orbital materials, Hund’s rule coupling (J) has attracted much attention. Various intriguing phases can occur by roles of J depending on the orbital occupancy. However, experimental confirmation of the orbital occupancy dependency has been challenging since controlling the orbital degrees of freedom normally accompanies chemical inhomogeneities. In this study, we demonstrate a method to investigate the role of orbital occupancy in J related phenomena without inducing inhomogeneities. By growing SrRuO3monolayers on various substrates with symmetry-preserving interlayers, we gradually tune the crystal field splitting and thus the orbital degeneracy of the Ru t2g orbitals. It effectively varies the orbital occupancies. Via in-situ angle-resolved photoemission spectroscopy, we observe a metal-insulator transition (MIT). The MIT occurs with orbital differentiation: concurrent opening of a band insulating gap in the dxy band and a Mott gap in the dxz/yz bands. Our study provides an effective experimental method for investigation of orbital-selective phenomena in multi-orbital materials. |
Tuesday, March 7, 2023 9:12AM - 9:24AM |
F30.00007: Competing orders in kagome metals AV3Sb5 Hanbit Oh, Sun-Woo Kim, Eun-Gook Moon, Youngkuk Kim A family of vanadium-based compounds AV3Sb5 (A = K, Rb, Cs) has recently emerged as a paradigmatic material to study diverse exotic states, including quantum spin liquids, time-reversal symmetry broken charge orderings, and chiral superconductivity. Despite prior exhaustive discoveries, a kagome lattice in genuine two dimensions is elusive, as all the known kagome materials are a three-dimensional approximant in a layered structure. In this work, we theoretically demonstrate that the AV3Sb5 monolayer can be stable and a host of strong electronic correlations from enriched van Hove singularities by using first-principles and mean-field calculations. Most importantly, the symmetry of two-dimensional monolayer is lowered enforced by stoichiometry which gives rise to the type-II van Hove singularities.We found that enrichment of the van Hove singularities leads to a variety of instabilities such as 2x2 charge density waves (CDW), s- and d-wave superconductivity orders, and the competing physics can be tuned via electron-filling or interaction strength. In connection with future experiments, we calculate the anomalous Hall conductivity that can probe the correlated orders. Lastly, we discuss plausible scenarios of nematicity in bulk system reported by recent experiments by unveiling the role of interlayer coupling based on the Ginzburg-Landau theory. |
Tuesday, March 7, 2023 9:24AM - 9:36AM |
F30.00008: Confinement transitions of the cuprate pseudogap metal Subir Sachdev, Alexander Nikolaenko, Darshan G Joshi, Maine Christos, Henry J Shackleton, Zhu-Xi Luo The pseudogap metal phase of the hole-doped cuprates can be described by small Fermi surfaces of electron-like quasiparticles, which enclose a volume violating the Luttinger relation. |
Tuesday, March 7, 2023 9:36AM - 9:48AM |
F30.00009: η-pairing in photodoped mix-D Hubbard Model Madhumita Sarkar, Zala Lenarcic, Denis Golez Strong excitations of correlated quantum materials give rise to various non-thermal phases which are not present in their equilibrium counterpart. Recently, it was shown that the one-dimensional Fermi Hubbard Model features charge density wave and η - pairing phases upon photo-doping. |
Tuesday, March 7, 2023 9:48AM - 10:00AM |
F30.00010: Growth, discovery and characterization of single crystalline Pt-Al and Eu-Pt-Al phases Juan Schmidt, Dominic H Ryan, Oliver Janka, Sergey L Budko, Paul C Canfield Recently, a Eu2Pt6Al15 phase synthesized by arc-melting followed by a thermal treatment was reported [1], showing a first order valence transition upon cooling below 50 K. In order to better understand the Pt-Al and Eu-Pt-Al phase space we grew single crystals of Al rich binary and ternary compounds via solution growth [2]. In addition to growing single crystals of PtAl4 [3] we discovered a new polymorph of Eu2Pt6Al15 obtained by high temperature solution growth, built from the same constituent layers as the previously reported one [1], though differently stacked. Despite the similarity between the two Eu2Pt6Al15 phases, the Eu valence and the magnetism have notably different behavior, revealing an interesting sensitivity to the way the layers are stacked. We report on x-ray diffraction, magnetization, resistivity and Mössbauer results to compare all of these phases in their pristine state, as well as their change under different thermal treatments. |
Tuesday, March 7, 2023 10:00AM - 10:12AM |
F30.00011: Ultralocalized Optoelectronic Properties of Nanobubbles in 2D Semiconductors Sara Shabani The major contributors to achieving localized optical emitters in transition-metal dichalcogenides materials at the nanoscale have been previously unclear and a robust experimental picture relating the local electronic structure with emission properties in such structures has so far been lacking. We use a combination of scanning tunneling microscopy (STM) and near-field photoluminescence (nano-PL) to probe the electronic and optical properties of single nanobubbles in bilayer heterostructures of WSe2 on MoSe2. We show from tunneling spectroscopy that there are electronic states deeply localized in the gap at the edge of such bubbles. We also show a significant change in the local band gap on the bubble, with a continuous evolution to the edge of the bubble. Nano-PL measurements observe a continuous redshift of the interlayer exciton on entering the bubble, in agreement with the band-to-band transitions measured by STM. We use self-consistent Schro¨dinger-Poisson simulations to capture the essence of the experimental results and find that strong doping in the bubble region is a key ingredient to achieving the observed localized states, together with mechanical strain. |
Tuesday, March 7, 2023 10:12AM - 10:24AM |
F30.00012: Emergence of competing electronic states from non-integer nuclear charges Jianwei Sun, James W Furness, Ruiqi Zhang, Jamin D Kidd Understanding many-electron phenomena with competing near-degenerate electronic states is of fundamental importance to chemistry and condensed matter physics. One of the most significant challenges for exploring such many-electron phenomena is the necessity for large system sizes in order to realize competing states, far beyond those practical for first-principles methods. Here, we show how allowing non-integer nuclear charges expands the space of computationally tractable electron systems that host competing electronic states. The emergence of competing electronic states from non-integer nuclear charges is exemplified in the simple 2-electron Hmol{2} molecule and used to examine the microscopic structure of doped quasi-1D cuprate chains, showing how non-integer nuclear charges can open a window for first-principles calculations of difficult many-electron phenomena. |
Tuesday, March 7, 2023 10:24AM - 10:36AM |
F30.00013: Fermi surface reconstruction at a heavy fermion quantum phase transition Andreas Gleis, Seung-Sup B. Lee, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar We address the sudden reconstruction of the Fermi surface at the Kondo breakdown quantum critical point (QCP) in heavy fermion systems. We mainly focus on results on the periodic Anderson model, obtained using a two-site cellular dynamical mean-field theory (CDMFT) approach. By employing the Numerical Renormalization Group (NRG) to solve the effective impurity model, we overcome the limitations faced by previous two-site CDMFT studies. At zero temperature, we find a continuous KB-QCP separating two Fermi liquid phases, which differ in their Fermi surface (FS) volumes. We discuss how this sudden FS volume change can be reconciled with Luttinger's sum rule. |
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