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Condensed Matter Seminar

Martin Mourigal, Georgia Tech
Speaker: Martin Mourigal, Georgia Tech Title: Anomalous spin dynamics in triangular quantum magnets. Abstract: The spin-1/2 triangular-lattice antiferromagnet is a central model in frustrated quantum magnetism: it is the first two-dimensional magnet proposed to host a SU(2) symmetric resonating valence-bond ground-state and its fractionalized magnetic excitations. Although it is now accepted that the model, at least in its simplest Heisenberg form, orders magnetically, it remains intimately associated with the concepts of quantum spin-liquid and exotic magnetic excitations. In the last few years, advances in materials discovery, crystal growth, neutron spectroscopy and theory have fueled a lively triangular-lattice antiferromagnet “renaissance”. In this talk, I will describe recent neutron scattering investigations on two realizations of this model: the transition metal compound Ba3CoSb2O9 and the rare-earth system YbMgGaO4. Experimental results elucidate the role of quantum fluctuations, spin-orbit coupling, chemical disorder, and non-linear effects in generating anomalous spin dynamics in these materials. This project is supported by the NSF under grant DMR-1750186. Host: Ar. Abanov

18 Jan 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


OPEN
Speaker: OPEN Title: Abstract: Host:

25 Jan 2019, 4:00PM | MIST M102


Workshop
Speaker: Workshop Title: Next Generation Xenon-based Dark Matter and Neutrino Detection. Abstract: Host: L. Strigari

1 Feb 2019, 4:00PM | MIST M102
Hosted By: L. Strigari


Ania Bleszynski Jayich, UCSB
Speaker: Ania Bleszynski Jayich, UCSB Title: The NV center in diamond: a versatile quantum technology. Abstract: The nitrogen vacancy (NV) center in diamond is an atomic-scale defect that exhibits remarkably coherent quantum properties in a uniquely accessible way: over a wide range of temperatures (1K-300K) and in ambient and high vacuum conditions. By incorporating the NV center into a scanning probe microscope geometry, we have demonstrated a powerful tool for imaging nanoscale magnetism in condensed matter systems [1]. Here I discuss two novel functionalities of the NV center afforded by its unique nature as a quantum sensor. I present NV-based conductivity imaging on the nanoscale in a quantitative and noninvasive way [2]. We also extend recently developed NV sensing techniques to simultaneously probe both the nanoscale structure and fluctuation dynamics of skyrmions in a thin-film system. [1] M. Pelliccione et al, Nature Nanotehcnology 11, 700 (2016) [2] Ariyaratne et al, Nature Communications 9, 2406 (2018) Host: Ar. Abanov

8 Feb 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


OPEN
Speaker: OPEN Title: Abstract: Host:

15 Feb 2019, 4:00PM | MIST M102


Michael Pretko, UC Boulder
Speaker: Michael Pretko, UC Boulder Title: Fractons, Elasticity, and Tensor Gauge Theories. Abstract: A fracton is a new type of emergent quasiparticle which cannot move by itself, yet is able to form mobile bound states. These exotic quasiparticles were first encountered in certain exactly solvable spin models. More recently, it has been demonstrated that fractons are concretely realized as the lattice defects of ordinary two-dimensional crystals. In this talk, I will first develop the theoretical framework for fractons in terms of tensor gauge theories, which have unusual conservation laws leading to the immobility of fractons. I will then discuss the physical realizations of fractons, focusing on the example of elasticity theory. Finally, I will discuss the phenomenology of fracton systems and some of the experimental signatures which can be used to diagnose the presence of these unusual new particles. Host: Ar. Abanov

22 Feb 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Shenglong Xu, University of Maryland, College Park
Speaker: Shenglong Xu, University of Maryland, College Park Title: Quantum information dynamics in many-body systems Abstract: In this talk, I will discuss new perspectives on many-body dynamics based on quantum information. Under unitary time evolution, information about a single spin gradually spreads out in space, and an effective light cone naturally emerges as an intrinsic property of the time evolution operator. Based on this picture, I will present a low-cost tensor network method that can accurately capture the shape of the causal light cone for generic 1D systems of hundreds of spins, a regime that was previously beyond reach. Using the method, we identify a new dynamical phase, characterized by a power-law-like causal light cone. Signatures of this new phase have already been observed in recent ultracold atom experiments on interacting quasi-periodic systems. Host: Ar. Abanov

1 Mar 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


APS March meeting,
Speaker: APS March meeting, Title: Abstract: Host: APS

8 Mar 2019, 4:00PM | Boston, MA
Hosted By: APS


Spring Break
Speaker: Spring Break Title: Abstract: Host:

15 Mar 2019, 4:00PM | MIST M102


Gregory David Fuchs, Cornell
Speaker: Gregory David Fuchs, Cornell Title: TBA Abstract: Host: Ar. Abanov

22 Mar 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Ilya Krivorotov, UC Irvine
Speaker: Ilya Krivorotov, UC Irvine Title: TBA Abstract: Host: Ar. Abanov

29 Mar 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Physics Festival
Speaker: Physics Festival Title: Abstract: Host:

5 Apr 2019, 4:00PM | MIST M102


Judy Cha, Yale
Speaker: Judy Cha, Yale Title: TBA Abstract: Host: Ar. Abanov

12 Apr 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


Shixiong Zhang, Indiana University Bloomington
Speaker: Shixiong Zhang, Indiana University Bloomington Title: TBA Abstract: Host: D. Naugle

19 Apr 2019, 4:00PM | MIST M102
Hosted By: D. Naugle


Gabor Csathy, Purdue
Speaker: Gabor Csathy, Purdue Title: TBA Abstract: Host: Ar. Abanov

26 Apr 2019, 4:00PM | MIST M102
Hosted By: Ar. Abanov


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Condensed Matter Information

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