Nonequilibrium magnetization in a ballistic quantum dot

Swahn, T.; Bogachek, É. N.; Galperin, Y. M.; Jonson, M.; Shekhter, R. I.

doi:10.1103/physrevlett.73.162

Cited by 23 publications

(13 citation statements)

References 11 publications

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“…Time-dependent behavior is an important problem in physics and control of mesoscopic Aharonov-Bohm devices [101,[111][112][113][114][115][116]. Three-site discrete quantum structure [99,117] proved to be an interesting configuration which may allow performing basic operations required for realization of qubit in hypothetical quantum computer.…”

Section: Persistent Currents In Normal Metals Superconductors and DImentioning

confidence: 99%

Persistent currents, flux quantization, and magnetomotive forces in normal metals and superconductors (Review Article)

Kulik

2010

Low Temperature Physics

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The notion of persistent current comes back to orbital currents in normal metals, semiconductors and even insulators displaying diamagnetic behavior in weak magnetic fields, but came to focus at the discovery of current persistence and magnetic flux quantization at large fields in atomically big but macroscopically small (mesoscopic) objects. The phenomenon bears much similarity with supercurrents in superconductive metals. We will review progress in developing of our understanding of the physical and technological aspects of this phenomenon. The exact solution for currents, magnetic moments and magnetomotive forces (torques) in crossed magnetic fields are presented. Time-dependent phenomena in crossed magnetic and electric fields, and in possibility of spontaneous persistent currents and of work extraction from static and dynamic quantum states are discussed.

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Section: Persistent Currents In Normal Metals Superconductors and DImentioning

confidence: 99%

Persistent currents, flux quantization, and magnetomotive forces in normal metals and superconductors (Review Article)

Kulik

2010

Low Temperature Physics

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“…This requires that inelastic relaxation time is not too long to allow electrons to follow adiabatically after slowly changing the magnetic flux. Specific relaxation of electrons, that of inelastic electron backscattering [ 19], is operative in establishing the equilibrium between the electrons. If the corresponding relaxation time is too long, persistent current might change, or vanish.…”

Section: It--~mentioning

confidence: 99%

Magnetic and electric Aharonov—Bohm effects in nanostructures

Kulik

1996

Physica B: Condensed Matter

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The paper reviews and extends the magnetic Aharonov-Bohm effect (persistent current, resistance oscillation) in normalmetal rings including spin-independent and spin-dependent hopping, Zeeman splitting, magnetic textures and wheels, ring rotation and weak coupling, as well as the electric Aharonov-Bohm effect ("persistent charge") in small metallic contacts. We then discuss dynamical screening effects in a surface charge in a metal. Energy dissipation due to motion of the surface charge has a singularity at the velocity of motion equal to the phonon propagation velocity. Surface image of an external charge inside the metal is strongly distorted at the velocity of motion larger than the Fermi velocity.

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“…The duration of the pulse is assumed to be much shorter than the ballistic time F , where F is the time needed by a particle at the Fermi level for completing one turn around the ring. This requirement is realizable experimentally since for typical ballistic rings F is of the order of several tens of picoseconds 15,32 and typical HCP's employed in this work and experimentally feasible are as short as 1 ps. 25 Consequently, one can safely treat the interaction of the charge carrier with the HCP within the impulsive approximation (IA).…”

Section: Introductionmentioning

confidence: 99%

“…For T Ϸ 0 K and for relatively weak pulses ͓ប 2 ␣ 2 / ͑4m * 0 2 ͒ Ӷ E F ͔, the relaxation time approximation is a reasonable way for the evaluation of the nonequilibrium distribution function. 32,34,35 In principle the relaxation of the system may occur via various mechanisms-e.g., electron-phonon scattering, electron-electron scattering, etc.…”

Section: Introductionmentioning

confidence: 99%

Field-free charge polarization of mesoscopic rings

Matos-Abiague

Berakdar

2004

Phys. Rev. B

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We investigate the electron dynamics in a one-dimensional mesoscopic ring under the influence of short, linearly polarized half-cycle electromagnetic pulses. It is shown that the pulses induce a nonequilibrium coherent population of electronic states such that a time-dependent charge polarization of the ring is induced. The time-dependent charge oscillations persist after the pulses have diminished and decay on a time scale determined by the relaxation time. The overall duration of the charge polarization can be controlled by applying an appropriate train of half-cycle pulses. Furthermore, we show that the emission spectrum associated with the pulse-induced charge oscillations can be modulated appropriately by tuning the parameters of the driving pulses. It is shown theoretically how the induced charge polarization can in principle be utilized to measure experimentally the relaxation time of the system in a field-free manner.We consider an isolated 1D ballistic mesoscopic ring at low temperature ͑T Ϸ 0 K͒. For a thin enough ring with a PHYSICAL

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Nonequilibrium magnetization in a ballistic quantum dot

Cited by 23 publications

References 11 publications

Persistent currents, flux quantization, and magnetomotive forces in normal metals and superconductors (Review Article)

Persistent currents, flux quantization, and magnetomotive forces in normal metals and superconductors (Review Article)

Magnetic and electric Aharonov—Bohm effects in nanostructures

Field-free charge polarization of mesoscopic rings

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