Results 31 to 40 of about 17,657 (203)

Nonlinear Hall Acceleration and the Quantum Rectification Sum Rule

, 2019
Electrons moving in a Bloch band are known to acquire an anomalous Hall velocity proportional to the Berry curvature of the band which is responsible for the intrinsic linear Hall effect in materials with broken time-reversal symmetry.
Matsyshyn, O., Sodemann, I.
core   +2 more sources

Generalized Berry phase for a bosonic Bogoliubov system with exceptional points [PDF]

Physical Review A, 2019
We discuss the topology of Bogoliubov excitation bands from a Bose-Einstein condensate in an optical lattice. Since the Bogoliubov equation for a bosonic system is non-Hermitian, complex eigenvalues often appear and induce dynamical instability.
Terumichi Ohashi, S. Kobayashi, Y. Kawaguchi   +2 more
semanticscholar   +1 more source

Non-Abelian Berry Phase, Instantons and N=(0,4) Supersymmetry

, 2010
In supersymmetric quantum mechanics, the non-Abelian Berry phase is known to obey certain differential equations. Here we study N=(0,4) systems and show that the non-Abelian Berry connection over R^{4n} satisfies a generalization of the self-dual Yang ...
Laia, João N.
core   +1 more source

Emergent Gauge Fields from Curvature in Single Layers of Transition-Metal Dichalcogenides. [PDF]

Physical Review Letters, 2016
We analyze the electron dynamics in corrugated layers of transition-metal dichalcogenides. Due to the strong spin-orbit coupling, the intrinsic (Gaussian) curvature leads to an emergent gauge field associated with the Berry connection of the spinor wave ...
H. Ochoa, R. Zarzuela, Y. Tserkovnyak
semanticscholar   +1 more source

Enabling Adiabatic Passages Between Disjoint Regions in Parameter Space through Topological Transitions [PDF]

, 2016
We explore topological transitions in parameter space in order to enable adiabatic passages between regions adiabatically disconnected within a given parameter manifold.
Kolodrubetz, Michael, Polkovnikov, Anatoli, Rosenberg, Steven, Souza, Tiago, Tomka, Michael   +4 more
core   +1 more source

2D Multifunctional Spin‐Orbit Coupled Dirac Nodal Line Materials

Advanced Functional Materials, EarlyView.
A total of 473 nonmagnetic and antiferromagnetic 2D spin‐orbit coupled Dirac nodal line materials are screened, spanning 5 layer groups and 12 magnetic space groups. Furthermore, it integrates their topological properties with electride, multiferroic, and magnetic characteristics, revealing unique systems with expanded functionalities and promising ...
Weizhen Meng, Ying Liu, Jialin Gong, Yalong Jiao, Xiaoming Zhang, Wenxian Li, Zhenxiang Cheng, Tie Yang   +7 more
wiley   +1 more source

Tensor Berry connections and their topological invariants

, 2019
The Berry connection plays a central role in our description of the geometric phase and topological phenomena. In condensed matter, it describes the parallel transport of Bloch states and acts as an effective "electromagnetic" vector potential defined in
Goldman, Nathan, Palumbo, Giandomenico
core   +1 more source

Parallel Transport and Band Theory in Crystals [PDF]

, 2014
We show that different conventions for Bloch Hamiltonians on non-Bravais lattices correspond to different natural definitions of parallel transport of Bloch eigenstates.
Carpentier, David, Fruchart, Michel, Gawędzki, Krzysztof   +2 more
core   +3 more sources

Reconfigurable Three‐Dimensional Superconducting Nanoarchitectures

Advanced Functional Materials, EarlyView.
3D superconducting nanostructures offer new possibilities for emergent physical phenomena. However, fabricating complex geometries remains challenging. Here 3D nanoprinting of complex 3D superconducting nanoarchitectures is established. As well as propagating superconducting vortices in 3D, anisotropic superconducting properties with geometric ...
Elina Zhakina, Luke Alexander Turnbull, Weijie Xu, Markus König, Paul Simon, Wilder Carrillo‐Cabrera, Amalio Fernández‐Pacheco, Uri Vool, Dieter Suess, Claas Abert, Vladimir M. Fomin, Claire Donnelly   +11 more
wiley   +1 more source

Low‐Symmetry Weyl Semimetals: A Path to Ideal Topological States

Advanced Functional Materials, EarlyView.
This study presents a theoretical framework for realizing ideal Weyl semimetals, where Weyl nodes are well‐isolated at the Fermi level. The approach is exemplified in the low‐symmetry material Cu2SnSe3, which exhibits tunable topological phases, current‐induced orbital magnetization, and a strong circular photogalvanic effect, making it a promising ...
Darius‐Alexandru Deaconu, Varun Shah, Rodion Vladimirovich Belosludov, Mohammad Saeed Bahramy   +3 more
wiley   +1 more source