Results 61 to 70 of about 176,214 (315)

Topological gravity with exchange algebra

, 1993
A topological gravity is obtained by twisting the effective $(2,0)$ super\-gravity. We show that this topological gravity has an infinite number of BRST invariant quantities with conformal weight $0$. They are a tower of OSp$(2,2)$ multiplets and satisfy
Alekseev, Alekseev, Alvarez-Gaumé, Aoyama, Aoyama, Aoyama, Aratyn, Babelon, Babelon, Berhadsky, Bilal, Bouwknegt, Cohn, Curtright, David, Delius, Di Vecchia, Distler, Distler, Eguchi, Eguchi, Faddeev, Gervais, Gross, Hollowood, Klebanov, Knizhnik, Lerche, Li, Lian, Montano, Neveu, Neveu, Polyakov, Polyakov, S Aoyama, Verlinde, Witten, Witten, Witten   +39 more
core   +1 more source

Terahertz‐Driven Ultrafast Dynamics of Rare‐Earth Nickelates by Controlling Only the Charge Degree of Freedom

Advanced Functional Materials, EarlyView.
The THz drive of the Mott insulating state of a rare‐earth nickelate induces instantaneous insulator‐metal transition via quantum tunneling of valence electrons across the bandgap. This transition is pure electronic and highly non‐thermal, which may find its applications in ultrafast opto‐electronics with enhanced performance and minimal device size ...
Gulloo Lal Prajapati, Sergey Kovalev, Igor Ilyakov, Atiqa Arshad, Gaurav Dubey, Ketan S. Navale, Dhanvir Singh Rana, Jan‐Christoph Deinert   +7 more
wiley   +1 more source

Topological Phases of Non-Hermitian Systems

Physical Review X, 2018
While Hermiticity lies at the heart of quantum mechanics, recent experimental advances in controlling dissipation have brought about unprecedented flexibility in engineering non-Hermitian Hamiltonians in open classical and quantum systems.
Zongping Gong, Yuto Ashida, Kohei Kawabata, Kazuaki Takasan, Sho Higashikawa, Masahito Ueda   +5 more
doaj   +1 more source

Topological numbers of quantum superpositions of topologically non-trivial bands

, 2019
In this Article we address the definition and values of topological numbers of the manifolds of wavefunctions - bands obtained by quantum superposition of the wavefunctions that belong to topologically distinct manifolds. The problem, although simple in essence, can be formulated as a paradox: it may seem that quantum superposition implies non-integer ...
Repin, E. V., Nazarov, Y. V.
openaire   +2 more sources

Universal Quantum Computation with the nu=5/2 Fractional Quantum Hall State

, 2005
We consider topological quantum computation (TQC) with a particular class of anyons that are believed to exist in the Fractional Quantum Hall Effect state at Landau level filling fraction nu=5/2. Since the braid group representation describing statistics
A. Kitaev, A. Y. Kitaev, M. Nielsen, P. W. Shor, S. Bravyi, Sergey Bravyi   +5 more
core   +1 more source

Single Pair of Weyl Points Evolve From Spin Group‐Protected Nodal Line in Half‐Metallic Ferromagnet V3S4

Advanced Functional Materials, EarlyView.
A spin group (SG)‐based mechanism is proposed to realize a single pair of Weyl points. PT‐symmetric nodal lines (NLs) persist under T‐breaking, protected by the combination of SG and P symmetry. When considering spin‐orbit coupling, the SG‐protected NL will split into Weyl points, which will also induce anomalous transport phenomena arising from ...
Shifeng Qian, Yao Zhang, Xiaowei Sheng, Xiuxian Yang, Gang Zhang, Junfeng Gao, Xiaotian Wang   +6 more
wiley   +1 more source

Quantum algorithm for persistent Betti numbers and topological data analysis

Quantum, 2022
Topological data analysis (TDA) is an emergent field of data analysis. The critical step of TDA is computing the persistent Betti numbers. Existing classical algorithms for TDA are limited if we want to learn from high-dimensional topological features because the number of high-dimensional simplices grows exponentially in the size of the data.
openaire   +3 more sources

Synchrotron Radiation for Quantum Technology

Advanced Functional Materials, EarlyView.
Materials and interfaces underpin quantum technologies, with synchrotron and FEL methods key to understanding and optimizing them. Advances span superconducting and semiconducting qubits, 2D materials, and topological systems, where strain, defects, and interfaces govern performance.
Oliver Rader, Sakura Pascarelli, Klaus Attenkofer, Anna A. Makarova, Karsten Holldack, Kai Rossnagel, Kristiaan Temst, George Kourousias, Stefano Carretta, Caterina Biscari, Helmut Dosch   +10 more
wiley   +1 more source

Second Chern Number and Non-Abelian Berry Phase in Topological Superconducting Systems

PRX Quantum, 2021
Topology ultimately unveils the roots of the perfect quantization observed in complex systems. The two-dimensional quantum Hall effect is the celebrated archetype.
H. Weisbrich, R.L. Klees, G. Rastelli, W. Belzig   +3 more
doaj   +1 more source

Understanding the Chemical and Electronic Properties of Sub‐Monolayer TiO2 on High Surface Area Silica for Jet Fuel Synthesis Applications

Advanced Functional Materials, EarlyView.
Sub‐monolayer titania grafted onto mesoporous silica enables solvent‐free photocatalytic upgrading of furfural and cyclopentanone into jet fuel precursors. Advanced spectroscopic methods reveal tunable surface speciation, acidity, and bandgaps, enhancing catalytic efficiency.
Mark A. Isaacs, Charalampos Drivas, Arthur Graf, Sasha Kroon, Santosh Kumar, Junxi Liu, Antonio Torres‐Lopez, Cameron Price, Edward Garland, Ines Lezcano‐Gonzalez, Christopher. M. A. Parlett, Vannia C. dos Santos‐Durndell, Lee J. Durndell   +12 more
wiley   +1 more source