Citation:
Harley D. Scammell, Mathias S. Scheurer, and Subir Sachdev. 2020. “Bilocal quantum criticality.” arXiv:2006.01834.
Ultra-Quantum Matter
Recent developments demonstrate that in the right circumstances, quantum aspects can extend to macroscopic scale. This is UQM.
Recent Publications
Critical drag as a mechanism for resistivity
Citation:
Dominic Else and T. Senthil. 6/29/2021. “Critical drag as a mechanism for resistivity”. arXiv
Abstract:
Critical drag is thus a mechanism for resistivity that, unlike conventional mechanisms, is unrelated to broken symmetries. We furthermore argue that an emergent symmetry that has the appropriate mixed anomaly with electric charge is in fact an inevitable consequence of compressibility in systems with lattice translation symmetry. Critical drag therefore seems to be the only way (other than through irrelevant perturbations breaking the emergent symmetry, that disappear at the renormalization group fixed point) to get nonzero resistivity in such systems. Finally, we present a very simple and concrete model -- the "Quantum Lifshitz Model" -- that illustrates the critical drag mechanism as well as the other considerations of the paper.Prediction of Toric Code Topological Order from Rydberg Blockade
Citation:
Ruben Verresen, Mikhail D. Lukin, and Ashvin Vishwanath. 2021. “Prediction of Toric Code Topological Order from Rydberg Blockade.” Phys. Rev. X. Publisher's Version
Topology of superconductors beyond mean-field theory
Citation:
Matthew F Lapa. 2020. “Topology of superconductors beyond mean-field theory.” arXiv:2003.05948 (accepted for publication in Phys. Rev. Research). Physical Review Research
Abstract:
The study of topological superconductivity is largely based on the analysis of mean-field Hamiltonians that violate particle number conservation and have only short-range interactions. Although this approach has been very successful, it is not clear that it captures the topological properties of real superconductors, which are described by number-conserving Hamiltonians with long-range interactions. To address this issue, we study topological superconductivity directly in the number-conserving setting.
Nanoscale-structured interactions and potential barriers for dipolar quantum gases
Citation:
Andreas Kruckenhauser, Lukas M. Sieberer, William G. Tobias, Kyle Matsuda, Luigi De Marco, Jun-Ru Li, Giacomo Valtolina, Ana Maria Rey, Jun Ye, Mikhail A. Baranov, and Peter Zoller. 2020. “Nanoscale-structured interactions and potential barriers for dipolar quantum gases.” arXiv:2001.11792.
Abstract:
We design dipolar quantum many-body Hamiltonians that will facilitate the realization of exotic quantum phases under the current experimental conditions achieved for polar molecules and magnetic atoms with large dipolar moments. The main idea is to modulate both two-body dipolar interactions and single-body potential barriers on a spatial scale of tens of nanometers to strongly enhance energy scales of engineered many-body systems. This new scheme greatly relaxes the requirement for low temperatures necessary for observing new quantum phases, especially in comparison to Hubbard Hamiltonians for regular optical lattices. For polar molecules, our approach builds on the use of microwave fields to couple rotational energy eigenstates in static electric fields with strong gradients. We illustrate this approach by demonstrating the orientation switching on the nanoscale for the induced electric dipole moment of a polar molecule. This configuration leads to the formation of interface bound states of fermionic molecules with binding energies far exceeding typical energy scales in current experiments. While the concepts are developed for polar molecules, many of the present ideas can be readily carried over to atoms with magnetic dipolar interactions.Conformal invariance and quantum non-locality in hybrid quantum circuits
Citation:
Yaodong Li, Xiao Chen, Andreas W. W. Ludwig, and Matthew P. A. Fisher. 2020. “Conformal invariance and quantum non-locality in hybrid quantum circuits.” arXiv e-prints, Pp. arXiv:2003.12721.
Bounds on Triangle Anomalies in (3+1)d
Citation:
Ying-Hsuan Lin, David Meltzer, Shu-Heng Shao, and Andreas Stergiou. 2020. “Bounds on Triangle Anomalies in (3+1)d.” Phys. Rev., D101, Pp. 125007.
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