open access publication

Article, 2022

Electronic Structure of InAs and InSb Surfaces: Density Functional Theory and Angle‐Resolved Photoemission Spectroscopy

In: Advanced Quantum Technologies, ISSN 2511-9044, Volume 5, 3, Page 2100033, 10.1002/qute.202100033

Contributors (13)

Yang, Shuyang (0000-0001-7579-814X) [1] Schröter, Niels B M [2] Strocov, Vladimir N [2] Schuwalow, Sergej (0000-0002-5446-018X) [3] Rajpalk, Mohana [4] Ohtani, Keita [4] Krogstrup, Peter (0000-0002-1930-8553) [3] [4] Winkler, Georg W (0000-0003-2677-7267) [5] [6] Gukelberger, Jan [6] Gresch, Dominik [5] Aeppli, Gabriel [2] [7] [8] Lutchyn, Roman M [5] [9] Marom, Noa (0000-0002-1508-1312) [1]

Affiliations

  1. [1] Carnegie Mellon University
  2. [NORA names: United States; America, North; OECD]
  3. [2] Paul Scherrer Institute
  4. [NORA names: Switzerland; Europe, Non-EU; OECD]
  5. [3] University of Copenhagen
  6. [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD]
  7. [4] Microsoft (Denmark)
  8. [NORA names: Other Companies; Private Research; Denmark; Europe, EU; Nordic; OECD]
  9. [5] Microsoft (United States)
  10. [NORA names: United States; America, North; OECD]
  11. [6] Microsoft Quantum, One Microsoft Way, Redmond, WA, 98052, USA
  12. [7] ETH Zurich
  13. [NORA names: Switzerland; Europe, Non-EU; OECD]
  14. [8] Swiss Federal Institute of Technology in Lausanne
  15. [NORA names: Switzerland; Europe, Non-EU; OECD]
  16. [9] Quantum Science Center

Abstract

The electronic structure of surfaces plays a key role in the properties of quantum devices. However, surfaces are also the most challenging to simulate and engineer. Here, the electronic structure of InAs(001), InAs(111), and InSb(110) surfaces is studied using a combination of density functional theory (DFT) and angle‐resolved photoemission spectroscopy (ARPES). Large‐scale first principles simulations are enabled by using DFT calculations with a machine‐learned Hubbard U correction [npj Comput. Mater. 6, 180 (2020)]. To facilitate direct comparison with ARPES results, a “bulk unfolding” scheme is implemented by projecting the calculated band structure of a supercell surface slab model onto the bulk primitive cell. For all three surfaces, a good agreement is found between DFT calculations and ARPES. For InAs(001), the simulations clarify the effect of the surface reconstruction. Different reconstructions are found to produce distinctive surface states, which may be detected by ARPES with low photon energies. For InAs(111) and InSb(110), the simulations help elucidate the effect of oxidation. Owing to larger charge transfer from As to O than from Sb to O, oxidation of InAs(111) leads to significant band bending and produces an electron pocket, whereas oxidation of InSb(110) does not. The combined theoretical and experimental results may inform the design of quantum devices based on InAs and InSb semiconductors, for example, topological qubits utilizing the Majorana zero modes. InAs and InSb nanowires interfaced with superconductors are regarded as the leading materials platform for the potential realization of qubits based on Majorana zero modes. The electronic structure of InAs and InSb surfaces is investigated using first‐principles simulations based on density functional theory and angle resolved photoemission spectroscopy experiments. The effects of surface reconstructions and oxidation are elucidated.

Funders

  • Office of the Director
  • Office of Science