Zobrazeno 1 - 10
of 244
pro vyhledávání: '"Emary C"'
Publikováno v:
J. Phys. A: Math. Theor. 51 325302 (2018)
We describe a technique to emulate a two-level \PT-symmetric spin Hamiltonian, replete with gain and loss, using only the unitary dynamics of a larger quantum system. This we achieve by embedding the two-level system in question in a subspace of a fo
Externí odkaz:
http://arxiv.org/abs/1803.06548
Autor:
Johnson, N., Emary, C., Ryu, S., Sim, H. -S., See, P., Fletcher, J. D., Griffiths, J. P., Jones, G. A. C., Farrer, I., Ritchie, D. A., Pepper, M., Janssen, T. J. B. M., Kataoka, M.
Publikováno v:
Phys. Rev. Lett. 121, 137703 (2018)
Using a recently-developed time-of-flight measurement technique with 1 ps time resolution and electron-energy spectroscopy, we developed a method to measure the longitudinal-optical-phonon emission rate of hot electrons travelling along a depleted ed
Externí odkaz:
http://arxiv.org/abs/1712.09031
Autor:
Kataoka, M., Johnson, N., Emary, C., See, P., Griffiths, J. P., Jones, G. A. C., Farrer, I., Ritchie, D. A., Pepper, M., Janssen, T. J. B. M.
Publikováno v:
Phys. Rev. Lett. 116, 126803 (2016)
We report time-of-flight measurements on electrons travelling in quantum-Hall edge states. Hot-electron wave packets are emitted one per cycle into edge states formed along a depleted sample boundary. The electron arrival time is detected by driving
Externí odkaz:
http://arxiv.org/abs/1512.02906
In recent charge-pump experiments, single electrons are injected into quantum Hall edge channels at energies significantly above the Fermi level. We consider here the relaxation of these hot edge-channel electrons through longitudinal-optical phonon
Externí odkaz:
http://arxiv.org/abs/1510.06922
Publikováno v:
New J. Phys. 15, 095008 (2013)
We present a theoretical study of a hybrid circuit-QED system composed of two semiconducting charge-qubits confined in a microwave resonator. The qubits are defined in terms of the charge states of two spatially separated double quantum dots (DQDs) w
Externí odkaz:
http://arxiv.org/abs/1304.7192
Our aim in this work is to study the nonequilibrium behavior of the topological quantum phase transition in the transverse Wen-plaquette model. We show that under the effect of a nonadiabatic driving the system exhibits a new topological phase and a
Externí odkaz:
http://arxiv.org/abs/1302.0781
Publikováno v:
Phys. Rev. E 87, 052110 (2013)
We establish a set of nonequilibrium quantum phase transitions in the Lipkin-Meshkov-Glick model under monochromatic modulation of the inter-particle interaction. We show that the external driving induces a rich phase diagram that characterizes the m
Externí odkaz:
http://arxiv.org/abs/1211.2683
Publikováno v:
Phys. Rev. A 86, 063627 (2012)
We establish a set of nonequilibrium quantum phase transitions in the Ising model driven under monochromatic nonadiabatic modulation of the transverse field. We show that besides the Ising-like critical behavior, the system exhibits an anisotropic tr
Externí odkaz:
http://arxiv.org/abs/1207.5242
Autor:
Karlström, O., Emary, C., Zedler, P., Pedersen, J. N., Bergenfeldt, C., Samuelsson, P., Brandes, T., Wacker, A.
Publikováno v:
J. Phys. A: Math. Theor. 46 (2013) 065301
We investigate the second-order von Neumann approach from a diagrammatic point-of-view and demonstrate its equivalence with the resonant tunneling approximation. Investigation of higher-order diagrams shows that the method correctly reproduces the eq
Externí odkaz:
http://arxiv.org/abs/1206.1744
We consider the Dicke model in the ultra-strong coupling limit to investigate thermal phase transitions and their precursors at finite particle numbers $N$ for bosonic and fermionic systems. We derive partition functions with degeneracy factors that
Externí odkaz:
http://arxiv.org/abs/1204.2271