Article
Materials Science, Multidisciplinary
Clara J. Lapp, Carsten Timm
Summary: Investigated the fate of flat bands on the surface of nodal noncentrosymmetric superconductors when subjected to an exchange field induced by a ferromagnetic insulator. Found that the spin polarization of the field affects the energies of states localized on the exchange-field strip, while states localized on the field-free strip are weakly affected. Demonstrated that a small exchange field can introduce a linear dispersion, allowing for the movement of a wave packet in a certain direction.
Article
Physics, Multidisciplinary
Zhesen Yang, Qinghong Yang, Jiangping Hu, Dong E. Liu
Summary: In this study, a realistic Floquet topological superconductor system was investigated, showing that the presence of dissipative behavior in the Floquet Majorana wire is influenced by the superconducting proximity effect. The study also proposed an effective model to simplify calculations of the lifetime of Floquet Majoranas, with findings indicating that the lifetime can be manipulated by external driving fields.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Archana Mishra, So Takei, Pascal Simon, Mircea Trif
Summary: Inserting magnetic impurities in an s-wave superconductor generates spin-polarized in-gap states called Shiba states, which affect the dynamics of classical moments and can be detected through ferromagnetic resonance measurements. The perturbation of Shiba states includes both reactive and dissipative torques on the precessing classical spin. These torques provide a direct measure of the even and odd frequency triplet pairings, offering a noninvasive alternative to scanning tunneling microscopy techniques for probing Shiba states.
Article
Materials Science, Multidisciplinary
Sreejith Chulliparambil, Lukas Janssen, Matthias Vojta, Hong-Hao Tu, Urban F. P. Seifert
Summary: We study exactly solvable spin-orbital models in two dimensions, which realize various spin-orbital-liquid phases and discuss the effects of magnetic fields and biquadratic spin-orbital perturbations. By analyzing different models and symmetries, we extend the list of exactly solvable models with spin-orbital-liquid ground states.
Article
Multidisciplinary Sciences
Philipp T. Dumitrescu, Justin G. Bohnet, John P. Gaebler, Aaron Hankin, David Hayes, Ajesh Kumar, Brian Neyenhuis, Romain Vasseur, Andrew C. Potter
Summary: Emerging programmable quantum simulation platforms provide unprecedented access to far-from-equilibrium quantum many-body dynamics in isolated systems. This study demonstrates a dynamically protected topological phase in a quasiperiodically driven array of ten Yb-171(+) hyperfine qubits. The phase exhibits edge qubits that are immune to control errors and external perturbations, relying on emergent dynamical symmetries. This work paves the way for implementing more complex dynamical topological orders that enable error-resilient manipulation of quantum information.
Article
Materials Science, Multidisciplinary
Jiabin Yu, Yang Ge, Sankar Das Sarma
Summary: This work explores the concept of fragile topology in dynamic systems by introducing the notion of dynamical fragile topology for noninteracting Floquet crystals. By analyzing the obstruction to static limits (OTSL), a definition for dynamical fragile topology is provided, showcasing its distinct characteristics compared to traditional static fragile topology defined by Wannier obstruction. Additionally, a specific 2 + 1D example is presented to illustrate the anomalous chiral edge modes in dynamical fragile topology, paving the way for further research in general quantum dynamics.
Article
Physics, Multidisciplinary
Albert F. Adiyatullin, Lavi K. Upreti, Corentin Lechevalier, Clement Evain, Francois Copie, Pierre Suret, Stephane Randoux, Pierre Delplace, Alberto Amo
Summary: By implementing a synthetic photonic lattice in a two-coupled ring system, we have successfully designed an anomalous Floquet metal that exhibits two different topological properties in its gapless bulk. Firstly, this synthetic lattice features bands characterized by a winding number, which emerges from the breakup of inversion symmetry and is directly linked to the appearance of Bloch suboscillations in its bulk. Secondly, the Floquet nature of the lattice leads to well-known anomalous insulating phases with topological edge states. The combination of broken inversion symmetry and periodic time modulation studied here enriches the range of topological phases available in lattices subject to Floquet driving, and suggests the potential emergence of novel phases when periodic modulation is combined with the breakup of spatial symmetries.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Condensed Matter
Adithi Udupa, Abhishek Banerjee, K. Sengupta, Diptiman Sen
Summary: This study focuses on a one-dimensional system of massless Dirac electrons with spin-orbit coupling and s-wave superconducting pairing, revealing interesting topological phenomena and new effects in superconducting structures. The analysis includes lattice and continuum models, exploring the emergence of Majorana zero energy modes and topological transitions in different scenarios. Additionally, the study discusses the presence of Andreev bound states and the AC Josephson effect in systems with different superconducting phases and potential barriers.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Multidisciplinary Sciences
En Li, Jin-Xin Hu, Xuemeng Feng, Zishu Zhou, Liheng An, Kam Tuen Law, Ning Wang, Nian Lin
Summary: The authors demonstrate the emergence of multiple ultra-flat electronic bands in twisted bilayer WSe2 using scanning tunneling microscopy and spectroscopy, indicating the potential for further study of exotic correlated phases in TB-TMDs.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Jiseon Shin, Bheema Lingam Chittari, Yunsu Jang, Hongki Min, Jeil Jung
Summary: In this study, we investigate the electronic structure of alternating-twist triple Bernal-stacked bilayer graphene (t3BG) by varying interlayer coupling, twist angle, interlayer potential difference, and sliding vector. We find that under certain parameters, the bands can flatten down to low energy levels, facilitating the formation of correlation-driven gaps.
Article
Multidisciplinary Sciences
Yong Hu, Samuel M. L. Teicher, Brenden R. Ortiz, Yang Luo, Shuting Peng, Linwei Huai, Junzhang Ma, Nicholas C. Plumb, Stephen D. Wilson, Junfeng He, Ming Shi
Summary: This study reports the spectroscopic evidence of topology and correlation effects in the kagome superconductor CsV3Sb5. The presence of topologically nontrivial surface states and flat bands suggests the potential for realizing Majorana zero modes and anomalous superconducting states in kagome lattices. CsV3Sb5 is established as a unique platform for exploring the interactions between charge order, topology, correlation effects, and superconductivity.
Article
Chemistry, Physical
F. Abud, N. Chaia, M. S. Torikachvili, R. F. Jardim
Summary: We investigated the structural and superconducting properties of Re3W1-xMx alloys, which can form both centrosymmetric and non-centrosymmetric phases. The non-centrosymmetric phase can be stabilized at high temperatures or by partial substitution of transition metals. The superconducting critical temperature decreases as the M content increases, but the overall superconducting properties remain similar. The pairing mechanism is not affected by substitution, and the superconducting behavior suggests a nodeless, s-wave gap symmetry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Daisuke Oshima, Satoshi Ikegaya, Andreas P. Schnyder, Yukio Tanaka
Summary: This paper studies the flat-band Majorana bound states in px-wave superconductors and proposes a promising device for effectively realizing px-wave superconductors. The emergence of flat-band Majorana bound states is demonstrated by calculating the local density of states.
PHYSICAL REVIEW RESEARCH
(2022)
Review
Chemistry, Physical
Branko Gumhalter, Dino Novko
Summary: Recent studies have shown that the energetics of spectral features on low index Ag surfaces are controlled by multiple quanta of plasmon energy rather than standard photon energies. To understand these features, the mechanism of plasmon-induced electron emission from metal surfaces is introduced and elaborated. The results suggest that plasmoemission channels complement standard photoemission channels.
PROGRESS IN SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Shengdan Tao, Xuanlin Zhang, Jiaojiao Zhu, Pimo He, Shengyuan A. Yang, Yunhao Lu, Su-Huai Wei
Summary: A new design principle is proposed to achieve low-energy ultra-flat bands with increased twist angles in intertwined bilayers of two-dimensional materials, providing a new route for investigating strong electron correlations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
