Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session F42: Synthetic Physics: Synthetic Dimensions, Gauge Fields, and Spin-Orbit CouplingInvited
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Sponsoring Units: DAMOP DCMP Chair: Dominik Schneble, Stony Brook University Room: LACC 502B |
Tuesday, March 6, 2018 11:15AM - 11:51AM |
F42.00001: Exploring the interplay of topology, disorder, kinetic frustration, and interactions in synthetic momentum-space lattices Invited Speaker: Bryce Gadway There has been much success over the past few decades in exploring coherent quantum dynamics of cold atoms in pristine, homogeneous real-space optical lattices. The recent development of highly-tunable synthetic lattices, based on parametric coupling between discrete quantum states, promises to open up myriad new systems and phenomena to experimental investigation. We describe our efforts to create synthetic lattices based on discrete momentum states of neutral atoms, which can be parametrically coupled with interfering Bragg laser fields. The unique spectroscopic control over all state-to-state transitions in our synthetic lattice allows us to create almost any single-particle tight-binding Hamiltonian, featuring nearly arbitrary arrangements of tunneling terms, artificial gauge fields, and site-energy landscapes. In addition, a key aspect of our approach based on cold atoms is the natural presence of nonlinear interactions, which can lead to emergent, correlated phenomena. We describe several unique problems that this synthetic lattice-based approach has allowed us to explore, dealing with the interplay of topology and disorder, disorder and kinetic frustration, and disorder and interactions. |
Tuesday, March 6, 2018 11:51AM - 12:27PM |
F42.00002: TBD Invited Speaker: Leonardo Fallani This abstract not available. |
Tuesday, March 6, 2018 12:27PM - 1:03PM |
F42.00003: Omnidirectional spin Hall effect in a Weyl spin-orbit coupled atomic gas Invited Speaker: Gediminas Juzeliunas The three-dimensional (3D) Weyl spin-orbit coupling (SOC) can be created for ultracold atoms by laser coupling four atomic internal states [1] or using a specially chosen sequence of inhomogeneous magnetic pulses [2]. It is now shown that applying such a 3D Weyl SOC, a transverse spin current is generated in response to either a constant spin-independent force or a time-dependent Zeeman field in an arbitrary direction [3]. This effect is the non-Abelian counterpart of the universal intrinsic spin Hall effect characteristic of the two-dimensional Rashba SOC. We quantify the strength of such an omnidirectional spin Hall effect by calculating the corresponding conductivity for fermions and non-condensed bosons. The absence of any kind of disorder in ultracold-atom systems makes the observation of this effect viable. |
Tuesday, March 6, 2018 1:03PM - 1:39PM |
F42.00004: Synthetic dimensions in ultracold molecules: quantum strings, membranes, and dissipation-induced topology Invited Speaker: Kaden Hazzard Ultracold molecules give rise to new types of correlated matter driven by their strong dipolar interactions and numerous rotational states. I will describe how one can exploit these rotational states as a "synthetic dimension", an extra effective spatial dimension in addition to the real physical ones. Hundreds of fully tunable synthetic lattice sites are feasible, in contrast to atoms, where synthetic dimensions are typically restricted to three sites. Molecules with synthetic dimensions show intriguing novel phenomena when frozen in place in a deep optical lattice and with microwaves applied to couple the rotational states. One possibility is a type of dissipation-driven topology. Another phase of matter spontaneously reduces its dimension, forming a fluctuating quantum string or membrane on which a strongly interacting condensate lives. I will describe this mechanism and our progress understanding the properties of this quantum membrane. |
Tuesday, March 6, 2018 1:39PM - 2:15PM |
F42.00005: Using ultracold atoms to study microscopic behavior of topologically non-trivial systems. Invited Speaker: Dina Genkina Topologically non-trivial materials are of great interest for their robustness, with existing applications in metrology and potential applications in quantum computing. Quantum Hall systems provide one of the simplest examples of topologically non-trivial materials, exhibiting transverse conductance, quantized to a very precise degree in accordance with their topology. More generally, the topology of 2D lattices can be characterized in terms of a Chern number, that also defines the number of conducting edge channels at the boundary of finite systems. We experimentally explore how small a finite size system can be while still exhibiting bulk topological properties. We use the control and precise measurement ability afforded by cold atoms to observe the microscopic motion in the bulk without relying on collective conduction measurements, and extract a Chern number for our system. Our experiments were performed in a synthetic-dimension lattice with of Bose-condensed 87 Rb [1,2,3] with about 1/3 flux quanta per unit cell, in thin strips only 3 and 5 sites wide. We applied a force along lattice's long dimension to sample the entire Brillouin zone, and demonstrated that for both a 3-site wide strip and a 5-site wide strip the bands still manifested non-trivial bulk topology [4,5].\\ \\ [1] A. Celi, P. Massignan, J. Ruseckas, N. Goldman, I.B. Spielman, G. Juzeliūnas, M. Lewenstein ,Synthetic gauge fields in synthetic dimensions. Phys. Rev. Lett. 112, 043001 (2014) [2] B. K. Stuhl, H.-I Lu, L. M. Aycock, D. Genkina, I. B. Spielman, Visualizing edge states with an atomic Bose gas in the quantum Hall regime. Science 349, 1514–1518 (2015). [3] M. Mancini 1 , G. Pagano, G. Cappellini, L. Livi, M. Rider, J. Catani, C. Sias, P. Zoller, M. Inguscio, M. Dalmonte, L. Fallani. Observation of chiral edge states with neutral fermions in synthetic hall ribbons. Science 349, 1510– (2015). [4] Wang C, Gao C, Jian C M and Zhai H, Direct measurement of topological invariants in optical lattices. 2010 Phys. Rev. Lett. 105 160403 [5] S. Mugel, A. Dauphin, P Massignan, L. Tarruell, M. Lewenstein, C Lobo, A. Celi, Measuring Chern numbers in Hofstadter strips. Scipost Physics. 3. 10.21468/SciPostPhys.3.2.012. |
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