Bulletin of the American Physical Society
Mid-Atlantic Section Fall Meeting 2020
Volume 65, Number 20
Friday–Sunday, December 4–6, 2020; Virtual
Session B04: Polar Materials & CMP&QM at NSF |
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Chair: Trevor Tysons, NJIT |
Friday, December 4, 2020 2:00PM - 2:36PM |
B04.00001: Novel Phases in Quantum Critical Polar Metals Invited Speaker: Premala Chandra It is well known that metals close to quantum critical points can exhibit novel phases including non-Fermi liquid behavior and unconventional superconductivity. Motivated by recent discoveries of polar metals that undergo inversion symmetry-breaking transitions, I’ll present a theoretical exploration of the emergence of strong correlations driven by criticality when the polar transition is tuned to zero. Several novel interacting phases will be discussed with specific predictions for experiment. [Preview Abstract] |
Friday, December 4, 2020 2:36PM - 3:12PM |
B04.00002: Novel Functionalities in Switchable Polar Materials from First Principles Invited Speaker: Karin M. Rabe First-principles methods have proved over recent years to be an increasingly powerful tool for the design and discovery of new materials with functional behavior driven by applied electric fields and stress. Systems of particular interest are piezoelectrics, ferroelectrics, antiferroelectrics, and materials with electric-field- or stress-controlled magnetic, optical, transport and topological properties. In this talk, I will present examples illustrating several current research directions, including (1) identification of new functional materials characterized by symmetry-inequivalent competing low-energy states, including antiferroelectrics, double ferroelectrics, and ``fraternal-twin'' ferroelectrics, and (2) investigation of the rich physics of ferroelectrics with free carriers, including leaky ferroelectrics, doped ferroelectrics, and electric-field-switchable polar metals. Interaction with experimental groups through the continued development of ``virtual instrument'' tools that connect first-principles results to experimental measurements will be discussed. [Preview Abstract] |
Friday, December 4, 2020 3:12PM - 3:24PM |
B04.00003: Nonlinear Hall effect as a potential response for polarity detection in polar metals Sobhit Singh, Jinwoong Kim, Karin M. Rabe, David Vanderbilt An experimental determination of electric polarization has remained challenging in metals and semimetals, although current experimental techniques allow us to easily detect and switch the ferroelectric polarization in insulators. In this work, we theoretically propose that nonlinear Hall current can serve as a potential response to detect the electric polarization in polar nonmagnetic metals/semimetals. We particularly focus on the polar metal LiOsO$_3$ and type-II Weyl semimetals T$_d$-MoTe$_2$ and T$_d$-WTe$_2$, and calculate the Berry curvature dipole moment (BCDM) tensor, a quantity first proposed by Sodemann and Fu [1], in the aforementioned systems. Our calculations indicate that the studied systems exhibit a non-vanishing BCDM indicating possible realization of nonlinear Hall current generated as the second order Hall response by an external electric field oscillating at low-frequencies $\mathcal{O}$(10-100 Hz) [2]. We further show that the polarity reversal is always accompanied by the reversal of BCDM and consequently, the reversal of the nonlinear Hall current, which can be experimentally detected [3]. Refs. [1] I. Sodemann and L. Fu, Phys. Rev. Lett. 115, 216806 (2015). [2] Ma et al., Nature 565, 337-342 (2019). [3] Singh et al., Phys. Rev. Lett. 125, 046402 (2020). [Preview Abstract] |
Friday, December 4, 2020 3:24PM - 4:00PM |
B04.00004: Update on CMP and Quantum Materials at NSF Invited Speaker: Tomasz Durakiewicz The Condensed Matter Physics program at the Division of Materials Research, NSF, supports experimental, as well as combined experiment and theory projects investigating the fundamental physics behind phenomena exhibited by condensed matter systems. In this presentation I will describe the current status of CMP program and discuss some of the program development activities related to the challenges and opportunities offered by the rapidly expanding area of Quantum Information Science and Engineering (QISE). I will also discuss the NSF approach to the all -- of -- government focus on QISE, stemming from the National Quantum Initiative and the specific plan outlined there for developing US capacity in the area of fundamental research, workforce and translation of QISE. [Preview Abstract] |
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