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Physicists harness quantum “time reversal” to measure vibrating atoms（图）
量子 时间反转 振动原子 原子钟 量子传感器
2023/6/9
The quantum vibrations in atoms hold a miniature world of information. If scientists can accurately measure these atomic oscillations, and how they evolve over time, they can hone the precision of ato...
Earth's last magnetic field reversal took far longer than once thought（图）
Earth magnetic field reversal took longer once thought
2019/10/21
Earth's magnetic field seems steady and true -- reliable enough to navigate by. Yet, largely hidden from daily life, the field drifts, waxes and wanes.The magnetic North Pole is currently shifting tow...
Time Reversal and Charge Conjugation in an Embedding Quantum Simulator
Charge Conjugation Embedding Quantum Simulator
2016/1/22
A quantum simulator is an important device that may soon outperform current classical computations. A basic arithmetic operation, the complex conjugate, however, is considered to be impossible to be i...
Exploring the potentials and limitations of the time-reversal imaging of finite seismic sources
potentials time-reversal imaging
2014/12/31
The characterisation of seismic sources with timereversed wave fields is developing into a standard technique
that has already been successful in numerous applications.
The utilization of time reversal symmetry in designing and implementing (quantum) optical experiments has become more and more frequent over the past years. We review the basic idea underlying time re...
Spin current and polarization reversal through a single-molecule magnet with ferromagnetic electrodes
Spin current polarization reversal single-molecule magnet ferromagnetic electrodes
2012/2/27
We theoretically study the spin-polarized transport through a single-molecule magnet, which is weakly coupled to ferromagnetic leads, by means of the rate-equation approach. We consider both the ferro...
Almost commuting unitary matrices related to time reversal
unitary matrices time reversal Operator Algebras
2011/9/16
Abstract: The behavior of fermionic systems depends on the geometry of the system and the symmetry class of the Hamiltonian and observables. Almost commuting matrices arise from band-projected positio...
The Time-Reversal- and Parity-Violating Nuclear Potential in Chiral Effective Theory
Time-Reversal Parity-Violating Nuclear Potential
2011/7/20
We derive the parity- and time-reversal-violating nuclear interactions stemming from the QCD theta term and quark/gluon operators of effective dimension 6: quark electric dipole moments, quark and glu...
Abstract: Felsner and Reuter introduced the linear extension diameter of a partially ordered set $\mathbf{P}$, denoted ${led}(\mathbf{P})$, as the maximum distance between two linear extensions of $\m...
Time-Reversal Symmetry in Non-Hermitian Systems
Time-Reversal Symmetry Non-Hermitian Systems Statistical Mechanics
2011/7/27
Time-Reversal Symmetry in Non-Hermitian Systems.
Penetration of nonquantized magnetic flux through a domain-wall bend in time-reversal symmetry broken superconductors
Penetration of nonquantized magnetic flux domain-wall superconductors
2010/11/22
It has been proposed that the superconductivity of Sr2RuO4 is characterized by pairing that is
unconventional and, furthermore, spontaneously breaks time-reversal symmetry. However, one of
the key e...
Realistic Time-Reversal Invariant Topological Insulators With Neutral Atoms
Realistic Time-Reversal Invariant Topological Neutral Atoms
2010/11/23
We lay out an experiment to realize time-reversal invariant topological insulators in alkali atomic gases. We introduce an original method to synthesize a gauge field in the near-field of an atom-chip...
Time Reversal of Some Stationary Jump-Diffusion Processes from Population Genetics
Jump-Diffusion Processes Population Genetics
2010/11/19
We describe the processes obtained by time reversal of a class of stationary jump-diffusion processes that model the dynamics of genetic variation in populations subject to repeated bottlenecks. Assu...
Field-tunable stochasticity in the magnetization reversal of a cylindrical nanomagnet
Field-tunable stochasticity magnetization reversal
2010/11/18
The nature of magnetization reversal in an isolated cylindrical nanomagnet has been studied
employing time-resolved magnetoresistance measurement. We find that the reversal mode is highly
stochastic...
Magnetic reversal processes and critical thickness in FePt/α-Fe/FePt trilayers
nucleation field coercivity pinning field hysteresis loop critical thickness
2010/11/24
Magnetic reversal processes of a FePt/α-Fe/FePt trilayer system with in-plane easy axes have been investigated within a micromagnetic approach. It is found that the magnetic reversal process consists ...