Zobrazeno 1 - 10
of 1 738
pro vyhledávání: '"Nakazato, H."'
Autor:
Nakazato, H., Ochiai, M.
The so-called Klein tunneling is re-examined within the framework of quantum field theory, but from a different point of view on the asymptotic states. We treat it as a one-dimensional scattering process of a fermion incident to a step potential and
Externí odkaz:
http://arxiv.org/abs/2111.06509
Publikováno v:
Phys. Rev. A 99, 052103 (2019)
A protocol for explicitly constructing the exact time-evolution operators generated by $2 \times 2$ time-dependent $PT$-symmetry Hamiltonians is reported. Its mathematical applicability is illustrated with the help of appropriate examples. The physic
Externí odkaz:
http://arxiv.org/abs/1903.04402
Publikováno v:
Linear Multilinear Algebra 67 (2019), no. 11, 2147--2158
We present a necessary and sufficient condition for the norm-parallelism of bounded linear operators on a Hilbert space. We also give a characterization of the Birkhoff--James orthogonality for Hilbert space operators. Moreover, we discuss the connec
Externí odkaz:
http://arxiv.org/abs/1811.00440
Publikováno v:
Annalen der Physik 2018, 1800198
The exact quantum dynamics of a single spin-1/2 in a generic time-dependent classical magnetic field is investigated and compared with the quantum motion of a spin-1/2 studied by Rabi and Schwinger. The possibility of regarding the scenario studied i
Externí odkaz:
http://arxiv.org/abs/1803.02086
Publikováno v:
Annals of Physics 385 (2017) 522-531
A novel recipe for exactly solving in finite terms a class of special differential Riccati equations is reported. Our procedure is entirely based on a successful resolution strategy quite recently applied to quantum dynamical time-dependent SU(2) pro
Externí odkaz:
http://arxiv.org/abs/1710.09122
Autor:
Ochiai, M., Nakazato, H.
Publikováno v:
J. Phys. Commun. 2 (2018) 015006
The completeness, together with the orthonormality, of the eigenfunctions of the Dirac Hamiltonian with a step potential is shown explicitly. These eigenfunctions describe the scattering process of a relativistic fermion off the step potential and th
Externí odkaz:
http://arxiv.org/abs/1709.06725
Publikováno v:
Phys. Rev. A 96, 023862 (2017)
Two oscillators coupled to a two-level system which in turn is coupled to an infinite number of oscillators (reservoir) are considered, bringing to light the occurrence of synchronization. A detailed analysis clarifies the physical mechanism that for
Externí odkaz:
http://arxiv.org/abs/1705.04667
Publikováno v:
Annals of Physics 392 (2018) 242-259
The quantum dynamics of a $\hat{\mathbf{J}}^2=(\hat{\mathbf{j}}_1+\hat{\mathbf{j}}_2)^2$-conserving Hamiltonian model describing two coupled spins $\hat{\mathbf{j}}_1$ and $\hat{\mathbf{j}}_2$ under controllable and fluctuating time-dependent magneti
Externí odkaz:
http://arxiv.org/abs/1703.07673
Publikováno v:
Phys. Rev. A 94, 022108 (2016)
Two coupled two-level systems placed under external time-dependent magnetic fields are modeled by a general Hamiltonian endowed with a symmetry that enables us to reduce the total dynamics into two independent two-dimensional sub-dynamics. Each of th
Externí odkaz:
http://arxiv.org/abs/1604.04519
Publikováno v:
Physical Review A 89, 063625 (2014)
When a Bose-Einstein condensate is divided into two parts, that are subsequently released and overlap, interference fringes are observed. We show here that this interference is typical, in the sense that most wave functions of the condensate, randoml
Externí odkaz:
http://arxiv.org/abs/1404.6130