Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session A42: Polar Phenomena in the Era of Quantum MaterialsInvited
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Sponsoring Units: DCMP Chair: Premala Chandra, Rutgers University Room: Ballroom B |
Monday, March 4, 2024 8:00AM - 8:36AM |
A42.00001: Dielectric Relaxation by Quantum Critical Magnons Invited Speaker: Daniel Flavian Blasco Quantum magnetism research aims to discover exotic phases of spin matter and quantum phase transitions between them. Low dimensionality and geometric frustration boost quantum fluctuations, stabilizing highly correlated states at low temperatures. Conversely, conventional multiferroics research focuses on practical applications of the interplay between ferroelectricity and magnetism, exploring typically classical effects. As a result, little overlap exists between these fields. |
Monday, March 4, 2024 8:36AM - 9:12AM |
A42.00002: Observation of a Quantum Dipole Liquid State in Organic Mott Insulators Invited Speaker: Natalia Drichko Mott insulators are commonly pictured with electrons localized on lattice sites, with their low-energy degrees of freedom involving spins only. Molecular Mott insulators allow to achieve electric dipoles on molecular lattice sites, resulting in the coupling of charge and magnetic degrees of freedom. We observe emergent charge degrees of freedom in a molecule-based triangular lattice Mott insulator κ-(BEDT-TTF)2Hg(SCN)2Br, resulting in a quantum dipole liquid state and exotic magnetic properties. Electrons localized on molecular (BEDT-TTF)2 lattice sites form electric dipoles that do not order at low temperatures and fluctuate with frequency detected experimentally in our Raman spectroscopy experiments. These fluctuations prevent an ordering of spins at low temperatures, resulting in dynamic ferromagnetic-like response. A small modification of the crystal structure achieved in κ-(BEDT-TTF)2Hg(SCN)2Cl leads to an appearance of an ordered ferroelectric state in this material below 30 K, and a spin singlet formation at 25 K. We discuss a possible phase diagram to describe these states and suggest experimental control parameters allowing to tune the ground states of these systems. |
Monday, March 4, 2024 9:12AM - 9:48AM |
A42.00003: Correlated Electrons in Polar Metals Invited Speaker: Pavel A Volkov Polar metals are materials in which itinerant electrons coexist with an inversion-symmetry breaking order, structurally identical to ferroelectric one in insulators. In my talk I will discuss the potential of electrons in polar metals to realize interaction-driven behaviors such as strange metallicity [1], dilute superconductivity [2] or collective modes [3]. The focus will be on systems close to quantum critical points of the polar order, where strong fluctuations of the soft mode – an optical phonon are present. A well-known example of such a system is doped SrTiO3, where the mechanism of superconductivity has remained an open question for more than 50 years. |
Monday, March 4, 2024 9:48AM - 10:24AM |
A42.00004: Unconventional Ferroelectricity in Moiré Heterostructures Invited Speaker: Pablo Jarillo-Herrero The understanding of strongly-interacting quantum matter has challenged physicists for decades. The discovery six years ago of correlated phases and superconductivity in magic angle twisted bilayer graphene has led to the emergence of a new materials platform to investigate strongly interacting physics, namely moiré quantum matter. These systems exhibit a plethora of quantum phases, such as correlated insulators, superconductivity, magnetism, and more. In this talk I will review some of the recent advances in the field, focusing on the discovery of different types of unconventional ferroelectricity in novel moiré heterostructuresnewest. In particular I will discuss stacking engineered ferroelectricity in bilayer boron nitride systems, as well as a novel ferroelectricity of electronic origin. I will end the talk with an outlook of some exciting directions in this emerging field. |
Monday, March 4, 2024 10:24AM - 11:00AM |
A42.00005: Criticality in Quantum Ferroelectric Metals Invited Speaker: Avraham Klein Quantum ferroelectric metals offer a fascinating window into the dynamical processes that give rise to inversion symmetry breaking in quantum materials. At the same time, they constitute an extremely promising platform for future quantum applications. I will describe a recent theoretical attempt to describe the ferroelectric quantum critical point in such systems, and share some insights about what makes the ferroelectric transition unique in the landscape of symmetry-breaking phenomena in correlated electron systems. |
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