Results 121 to 130 of about 357,046 (309)

De Sitter at all loops: the story of the Schwinger model

Journal of High Energy Physics
We consider the two-dimensional Schwinger model of a massless charged fermion coupled to an Abelian gauge field on a fixed de Sitter background. The theory admits an exact solution, first examined by Jayewardena, and can be analyzed efficiently using ...
Dionysios Anninos, Tarek Anous, Alan Rios Fukelman   +2 more
doaj   +1 more source

Quantum Fields on Noncommutative Spacetimes: Theory and Phenomenology

Symmetry, Integrability and Geometry: Methods and Applications, 2010
In the present work we review the twisted field construction of quantum field theory on noncommutative spacetimes based on twisted Poincaré invariance.
Aiyalam P. Balachandran, Alberto Ibort, Giuseppe Marmo, Mario Martone   +3 more
doaj   +1 more source

High‐Entropy Magnetism of Murunskite

Advanced Functional Materials, EarlyView.
The study of murunskite (K2FeCu3S4) reveals that its magnetic and orbital order emerges in a simple I4/mmm crystal structure with complete disorder in the transition metal positions. Mixed‐valence Fe ions randomly occupy 1/4 of the tetrahedral sites, with the remaining 3/4 being filled by non‐magnetic Cu+ ions.
Davor Tolj, Priyanka Reddy, Ivica Živković, Luka Akšamović, Jian Rui Soh, Kamila Komȩdera, Izabela Biało, Naveen Kumar Chogondahalli Muniraju, Trpimir Ivšić, Mario Novak, Oksana Zaharko, Clemens Ritter, Thomas LaGrange, Wojciech Tabiś, Ivo Batistić, László Forró, Henrik M. Rønnow, Denis K. Sunko, Neven Barišić   +18 more
wiley   +1 more source

Basics of the density functional theory

AIMS Materials Science, 2017
The density functional theory (DFT) established itself as a well reputed way to compute the electronic structure in most branches of chemistry and materials science.
Jean-Louis Bretonnet
doaj   +1 more source

Pair-breaking quantum phase transition in superconducting nanowires

, 2018
A quantum phase transition (QPT) between distinct ground states of matter is a wide-spread phenomenon in nature, yet there are only a few experimentally accessible systems where the microscopic mechanism of the transition can be tested and understood ...
A Bezryadin, A Maestro Del, A Maestro Del, A Maestro Del, A Rogachev, A Steppke, A Yazdani, Adrian Del Maestro, Andrey Rogachev, AT Bollinger, AV Lopatin, B Lake, Benjamin Sacépé, DJ Thouless, EJ Konig, Frédéric Gay, H Kim, H Kim, H Kim, Hyunjeong Kim, IF I. F. Herbut, JA Hoyos, JR Tucker, K Damle, K Jin, K Makise, KYu Arutyunov, M Ovadia, M Sahu, M Tinkham, MD Stewart, MG Alford, MPA Fisher, N Marković, N Mason, N Shah, P Cejnar, P Li, RM Potok, V Galitski, W Kuo, W Ning, X Zhang   +42 more
core   +2 more sources

Ab Initio Study on 3D Anisotropic Ferroelectric Switching Mechanism and Coercive Field in HfO2 and ZrO2

Advanced Functional Materials, EarlyView.
This study uncovers a new switching mechanism in HfO2 and ZrO2, where the absence of a non‐polar layer along the a‐direction induces interaction between polar layers. Consequently, the switching barriers for growth are lower than those for nucleation in this direction, leading to a size‐dependent coercive field that matches experimental observations ...
Kun Hee Ye, Taeyoung Jeong, Seungjae Yoon, Dohyun Kim, Yunjae Kim, Cheol Seong Hwang, Jung‐Hae Choi   +6 more
wiley   +1 more source

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Quantum scaling for the metal–insulator transition in a two-dimensional electron system

Scientific Reports
The quantum phase transition observed experimentally in two-dimensional (2D) electron systems has been a subject of theoretical and experimental studies for almost 30 years.
V. Kagalovsky, S. V. Kravchenko, D. Nemirovsky   +2 more
doaj   +1 more source

Many-Body Quantum Chaos: Analytic Connection to Random Matrix Theory

Physical Review X, 2018
A key goal of quantum chaos is to establish a relationship between widely observed universal spectral fluctuations of clean quantum systems and random matrix theory (RMT).
Pavel Kos, Marko Ljubotina, Tomaž Prosen   +2 more
doaj   +1 more source

NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity

Advanced Functional Materials, EarlyView.
This study presents novel anti‐counterfeiting tags with multilevel security features that utilize additional disguise features. They combine luminescent nanosized Ln‐MOFs with conductive polymers to multifunctional mixed‐matrix membranes and powder composites. The materials exhibit visible/NIR emission and matrix‐based conductivity even as black bodies.
Moritz Maxeiner, Ruben Maile, Murat Cuvalli, Andreas Wolf, Ayisha Komal, Robert Oestreich, Christoph Janiak, Karl Mandel, Alexander Knebel, Klaus Müller‐Buschbaum   +9 more
wiley   +1 more source