Other Condensed Matter

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New submissions for Tue, 21 May 24

[1]  arXiv:2405.11462 [pdf, other]

Title: Exciton polariton critical non-Hermitian skin effect with spin-momentum-locked gains

Authors: Xingran Xu, Lingyu Tian, Zhiyuan An, Qihua Xiong, Sanjib Ghosh

Subjects: Optics (physics.optics); Other Condensed Matter (cond-mat.other)

The critical skin effect, an intriguing phenomenon in non-Hermitian systems, displays sensitivity to system size and manifests distinct dynamical behaviors. In this work, we propose a novel scheme to achieve the critical non-Hermitian skin effect of exciton polaritons in an elongated microcavity system. We show that by utilising longitudinal-transverse spin splitting and spin-momentum-locked gain, a critical non-Hermitian skin effect can be achieved in a continuous system without the need of an underlying lattice. We find that a phase transition can be induced by changing the cavity detuning with respect to the exciton energy. We identify a measurable order parameter associated with this phase transition and demonstrate the corresponding critical behavior. Our work offers a flexible approach to manipulate non-Hermitian phases of exciton polaritons, thereby expanding the potential applications of polaritonic devices.

[2]  arXiv:2405.11625 [pdf, other]

Title: Universal spectra of noisy parameterized quantum circuits

Authors: Kristian Wold, Pedro Ribeiro, Sergey Denisov

Comments: 4 figures plus SM

Subjects: Quantum Physics (quant-ph); Other Condensed Matter (cond-mat.other)

Random unitaries are an important resource for quantum information processing. While their universal properties have been thoroughly analyzed, it is not known what happens to these properties when the unitaries are sampled on the present-day noisy intermediate-scale quantum (NISQ) computers. We implement parameterized circuits, which have been proposed as a means to generate random unitaries, on a transmon platform and model these implementations as quantum maps. To retrieve the maps, a machine-learning assisted tomography is used. We find the spectrum of a map to be either an annulus or a disk depending on the circuit depth and detect an annulus-disk transition. By their spectral properties, the retrieved maps appear to be very similar to a recently introduced ensemble of random maps, for which spectral densities can be analytically evaluated.

[3]  arXiv:2405.11810 [pdf, ps, other]

Title: Formation of Iron-Helium Compounds under High Pressure

Authors: Haruki Takezawa, Han Hsu, Kei Hirose, Fumiya Sakai, Suyu Fu, Hitoshi Gomi

Comments: 30 pages, 14 figures, 4 tables

Subjects: Materials Science (cond-mat.mtrl-sci); Other Condensed Matter (cond-mat.other)

While helium is a representative noble gas element characterized by its chemical inertness at ambient conditions, recent experiments and calculations argued that a minor amount of helium is incorporated into molten iron from silicate under high pressures. Here we examined the reaction between iron and helium at 8-42 GPa and ~1000-2820 K and found remarkable volume expansion of the Fe lattice, which is attributed to the formations of fcc and distorted hcp iron-helium compounds with x in FeHex up to 0.13 and 0.42, respectively. Upon releasing pressure under room temperature, these fcc and distorted hcp FeHex were still observed while the former lost some helium. In addition, our first-principles calculations indicate that fcc FeHe0.25, with He atoms in the tetrahedral interstitial sites, is dynamically stable in different magnetic states throughout 0-50 GPa. These results support that the Earth's core can be a large reservoir of primordial 3He.

Replacements for Tue, 21 May 24

[4]  arXiv:2402.00181 (replaced) [pdf, other]

Title: QUEST-DMC: Background Modelling and Resulting Heat Deposit for a Superfluid Helium-3 Bolometer

Authors: S. Autti, A. Casey, N. Eng, N. Darvishi, P. Franchini, R.P. Haley, P.J. Heikkinen, A. Kemp, E. Leason, L.V. Levitin, J. Monroe, J. March-Russel, M.T. Noble, J.R. Prance, X. Rojas, T. Salmon, J. Saunders, R. Smith, M.D. Thompson, V. Tsepelin, S.M. West, L. Whitehead, K. Zhang, D.E. Zmeev

Journal-ref: Journal of Low Temperature Physics, Special Issue: Quantum Fluids and Solids (QFS2023)

Subjects: Other Condensed Matter (cond-mat.other); Instrumentation and Detectors (physics.ins-det)

[5]  arXiv:2405.05505 (replaced) [pdf, other]

Title: Unveiling Higher-Order Topology via Polarized Topological Charges

Authors: Wei Jia, Bao-Zong Wang, Ming-Jian Gao, Jun-Hong An

Comments: 8+8 pages, 4+3 figures. References are updated.Typos are corrected

Subjects: Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Other Condensed Matter (cond-mat.other); Quantum Gases (cond-mat.quant-gas); Quantum Physics (quant-ph)

[6]  arXiv:2405.06853 (replaced) [pdf, other]

Title: Quantum State Transfer in Interacting, Multiple-Excitation Systems

Authors: Alexander Yue, Rubem Mondaini, Qiujiang Guo, Richard T. Scalettar

Comments: 12 pages, 8 figures

Subjects: Quantum Physics (quant-ph); Other Condensed Matter (cond-mat.other)

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