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Control of Electron State Coupling in Asymmetric Ge/GeSi Quantum Wells

Ciano, Chiara; Virgilio, Michele; Montanari, Michele; Persichetti, Luca; Di Gaspare, Luciana; Ortolani, Michele; Baldassarre, Leonetta; Zoellner, Marvin H.; Skibitzki, Oliver; Scalari, Giacomo; Faist, Jerome; Paul, Douglas J.; Scuderi, Mario; Nicotra, Giuseppe; Grange, Thomas; Birner, Stefan; Capellini, Giovanni; De Seta, Monica


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.2319242", 
  "container_title": "Physical Review Applied", 
  "title": "Control of Electron State Coupling in Asymmetric Ge/GeSi Quantum Wells", 
  "issued": {
    "date-parts": [
      [
        2018, 
        12, 
        16
      ]
    ]
  }, 
  "abstract": "<p><em>Theoretical predictions indicate that the n-type Ge/SiGe multi quantum-well system is the most promising material for the realization of a Si-compatible THz quantum cascade laser operating at room temperature. To advance in this direction, we study both experimentally and theoretically asymmetric coupled multi quantum-well samples based on this material system, that can be considered as the basic building block of a cascade architecture. Extensive structural characterization shows the high material quality of strain-symmetrized structures grown by chemical vapor deposition, down to the ultrathin barrier limit. Moreover, THz absorption spectroscopy measurements supported by theoretical modeling unambiguously demonstrate inter-well coupling and wavefunction tunneling. The agreement between experimental data and simulations allowed us to characterize the tunneling barrier parameters and, in turn, achieve a highly-controlled engineering of the electronic structure in forthcoming unipolar cascade systems based on n-type Ge/SiGe multi quantum-wells.</em></p>", 
  "author": [
    {
      "family": "Ciano, Chiara"
    }, 
    {
      "family": "Virgilio, Michele"
    }, 
    {
      "family": "Montanari, Michele"
    }, 
    {
      "family": "Persichetti, Luca"
    }, 
    {
      "family": "Di Gaspare, Luciana"
    }, 
    {
      "family": "Ortolani, Michele"
    }, 
    {
      "family": "Baldassarre, Leonetta"
    }, 
    {
      "family": "Zoellner, Marvin H."
    }, 
    {
      "family": "Skibitzki, Oliver"
    }, 
    {
      "family": "Scalari, Giacomo"
    }, 
    {
      "family": "Faist, Jerome"
    }, 
    {
      "family": "Paul, Douglas J."
    }, 
    {
      "family": "Scuderi, Mario"
    }, 
    {
      "family": "Nicotra, Giuseppe"
    }, 
    {
      "family": "Grange, Thomas"
    }, 
    {
      "family": "Birner, Stefan"
    }, 
    {
      "family": "Capellini, Giovanni"
    }, 
    {
      "family": "De Seta, Monica"
    }
  ], 
  "page": "014003", 
  "volume": "11", 
  "type": "article-journal", 
  "id": "2319242"
}
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