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Density matrix approach to photon-assisted tunneling in the transfer Hamiltonian formalism

Journal Article · · Physical Review B
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The transfer Hamiltonian tunneling current is derived in a time-dependent density matrix formulation and is used to examine photon-assisted tunneling. Bardeen's tunneling expression arises as the result of first-order perturbation theory in a mean-field expansion of the density matrix. Photon-assisted tunneling from confined electromagnetic fields in the forbidden tunnel barrier region occurs due to time-varying polarization and wave-function overlap in the gap which leads to a nonzero tunneling current in asymmetric device structures, even in an unbiased state. The photon energy is seen to act as an effective temperature-dependent bias in a uniform barrier asymmetric tunneling example problem. Higher-order terms in the density matrix expansion give rise to multiphoton enhanced tunneling currents that can be considered an extension of nonlinear optics where the nonlinear conductance plays a similar role as the nonlinear susceptibilities in the continuity equations.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1465798
Alternate ID(s):
OSTI ID: 1420017
Report Number(s):
SAND--2017-11873J; 663116
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 7 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Power Generation from a Radiative Thermal Source Using a Large-Area Infrared Rectenna journal May 2018
Electrical power generation from moderate-temperature radiative thermal sources journal February 2020
Power generation from a radiative thermal source using a large-area infrared rectenna text January 2018

Figures / Tables (2)


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