Analytical simulations of the resonant transmission of electrons in a closed nanocircuit for terahertz applications where a tunneling junction is shunted by a metallic nanowire

• URL: http://arxiv.org/abs/2310.16860v1
• Date: Wed, 25 Oct 2023 02:29:15 GMT
• Title: Analytical simulations of the resonant transmission of electrons in a closed nanocircuit for terahertz applications where a tunneling junction is shunted by a metallic nanowire
• Authors: Mark Hagmann
• Abstract summary: We model closed quantum nanocircuits shunted by a beryllium filament for quasi-coherent electron transport over mean-free paths as great as 68 nm. Each model has four parameters: (1) the barrier length, (2) the height and shape of the barrier, (3) the length of the pre-barrier, and (4) the electron energy.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Earlier, in the CINT program at Los Alamos National Laboratory, we focused ultrafast mode-locked lasers on the tip-sample junction of a scanning tunneling microscope to generate currents at hundreds of harmonics of the laser pulse repetition frequency. Each harmonic has a signal-to-noise ratio of 20 dB with a 10-dB linewidth of only 3 Hz. Now we model closed quantum nanocircuits with rectangular, triangular, or delta-function barrier, shunted by a beryllium filament for quasi-coherent electron transport over mean-free paths as great as 68 nm. The time-independent Schr\"odinger equation is solved with the boundary conditions that the wavefunction and its derivative are continuous at both connections. These four boundary conditions are used to form a four-by-four complex matrix equation with only zeros in the right-hand column vector which is required to have a non-trivial solution with each of the closed nanocircuits. Each model has four parameters: (1) the barrier length, (2) the height and shape of the barrier, (3) the length of the pre-barrier, and (4) the electron energy. Any three of these may be specified and then the fourth is varied to bring the determinant to zero to find the solutions on lines or surfaces in the space defined by the four parameters. First, we use a simplistic model having a rectangular barrier. The second model has a triangular barrier as a first approximation to field emission, and we are considering applying this approach for a self-contained nanoscale extension of our earlier effort to generate the harmonics at Los Alamos. The third model has a delta-function barrier, and the fourth model is an extension of the first one where the width of the rectangular barrier is varied inversely with its height.

Related papers

• Analytical solutions for five examples of shunted tunneling junctions showing promise for terahertz applications [0.0]
  We study the interaction of electrons with shunted models consisting of a rectangular, triangular, or delta function. The shunts could be filaments of certain metals that provide quasi-coherent electron transport over mean-free paths of tens of nm.
  arXiv  Detail & Related papers  (2024-04-20T16:02:46Z)
• Determination of the modes in two types of closed circuits with quantum tunneling [0.0]
  We solve the Schr"odinger equation for a one-dimensional model having a square potential barrier in free-space. We use the boundary condition that the wavefunction and its derivative are continuous at the both ends of this model to obtain a homogeneous matrix equation. Only static solutions are considered, but this method could be applied to time-dependent cases under quasistatic conditions.
  arXiv  Detail & Related papers  (2023-04-26T18:47:35Z)
• Non-Hermitian zero mode laser in a nanophotonic trimer [55.41644538483948]
  We report on the direct observation of a lasing zero mode in a non-Hermitian three coupled nanocavity array. We show efficient excitation for nearly equal pump power in the two extreme cavities. The realization of zero mode lasing in large arrays of coupled nanolasers has potential applications in laser-mode engineering.
  arXiv  Detail & Related papers  (2023-02-03T15:21:44Z)
• Quantum emulation of the transient dynamics in the multistate Landau-Zener model [50.591267188664666]
  We study the transient dynamics in the multistate Landau-Zener model as a function of the Landau-Zener velocity. Our experiments pave the way for more complex simulations with qubits coupled to an engineered bosonic mode spectrum.
  arXiv  Detail & Related papers  (2022-11-26T15:04:11Z)
• Wave functions for high-symmetry, thin microstrip antennas and two-dimensional quantum boxes [48.7576911714538]
  For a spinless quantum particle in a one-dimensional box or an electromagnetic wave in a one-dimensional cavity, the respective Dirichlet and Neumann boundary conditions both lead to non-degenerate wave functions. In two spatial dimensions, the symmetry of the box or microstrip antenna is an important feature that has often been overlooked in the literature.
  arXiv  Detail & Related papers  (2021-08-18T00:57:42Z)
• Tri-unitary quantum circuits [0.0]
  We introduce a class of quantum circuits that are unitary along three distinct "arrows of time" Two-point correlations in these dynamics are strictly confined to three directions in $ (1+1)$-dimensional spacetime. We extend our circuit construction to $2+1$ dimensions, where two-point correlation functions are confined to the one-dimensional edges of a tetrahedral light cone.
  arXiv  Detail & Related papers  (2021-06-14T18:10:12Z)
• Modulated longitudinal gates on encoded spin-qubits via curvature couplings to a superconducting cavity [0.0]
  We propose entangling operations based on the energy curvature couplings of encoded spin qubits to a superconducting cavity. For a two-qubit entangling gate we explore acquired geometric phases via a time-modulated longitudinal $sigma_z$-coupling. The proposed schemes seem suitable for remote spin-to-spin entanglement of two spin-qubits or a cluster of spin-qubits.
  arXiv  Detail & Related papers  (2020-10-03T00:04:56Z)
• Possibility of coherent electron transport in a nanoscale circuit [0.0]
  In some nanoscale circuits, the electron mean-free path may be as long as 68 nm in metals. We consider the use of single-crystal wires, and include a tunneling junction to focus and collimate the electrons near the axis. Our simulations suggest that, in addition to the incoherent phenomena, there are extremely sharply-defined coherent modes in nanoscale circuits.
  arXiv  Detail & Related papers  (2020-09-26T19:50:56Z)
• Quantum anomalous Hall phase in synthetic bilayers via twistless twistronics [58.720142291102135]
  We propose quantum simulators of "twistronic-like" physics based on ultracold atoms and syntheticdimensions. We show that our system exhibits topologicalband structures under appropriate conditions.
  arXiv  Detail & Related papers  (2020-08-06T19:58:05Z)
• Resonant high-energy bremsstrahlung of ultrarelativistic electrons in the field of a nucleus and a pulsed light wave [68.8204255655161]
  Research investigates the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies in the field of a nucleus and a quasimonochromatic laser wave.
  arXiv  Detail & Related papers  (2020-04-05T16:27:11Z)
• Radiative topological biphoton states in modulated qubit arrays [105.54048699217668]
  We study topological properties of bound pairs of photons in spatially-modulated qubit arrays coupled to a waveguide. For open boundary condition, we find exotic topological bound-pair edge states with radiative losses. By joining two structures with different spatial modulations, we find long-lived interface states which may have applications in storage and quantum information processing.
  arXiv  Detail & Related papers  (2020-02-24T04:44:12Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.