Coherent quantum transport in the presence of a finite-range transversely polarized time-dependent field

Abstract

This work investigates the quantum transport in a narrow constriction acted upon by a finite-range transversely polarized time-dependent electric field. A generalized scattering-matrix method is developed that has incorporated a time-dependent mode-matching scheme. The transverse field induces coherent inelastic scatterings that include both intersubband and intersideband transitions. These scatterings give rise to the dc conductance $G$ a general suppressed feature that escalates with the chemical potential. In addition, particular suppressed features -- the dip structures -- are found in $G$. These features are recognized as the quasi-bound-state (QBS) features that arise from electrons making intersubband transitions to the vicinity of a subband bottom. For the case of larger field intensities, the QBS features that involve more photons are more evident. These QBS features are closely associated with the singular density of states at the subband bottoms. An experimental setup is proposed for the observation of these features.

8 pages, 4 figures

References in corpus (2)

• Coherent quantum transport in narrow constrictions in the presence of a finite-range longitudinally polarized time-dependent field
• Differential conductance of a saddle-point constriction with a time-modulated gate-voltage

Cited by in corpus (6)

• Transport through a quantum ring, a dot and a barrier embedded in a nanowire in magnetic field
• Transport spectroscopy in a time-modulated open quantum dot
• Finger-gate array quantum pumps:pumping characteristics and mechanisms
• Tuning of coupling modes in laterally parallel double open quantum dots
• Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots
• Multi-mode transport through a quantum nanowire with two embedded dots