Interactions in the 8-orbital model for twisted bilayer graphene

Autor: Maria J. Calderon, Elena Bascones

Publikováno v: Physical Review B. 102

We calculate the interactions between the Wannier functions of the 8-orbital model for twisted bilayer graphene (TBG). In this model, two orbitals per valley centered at the AA regions, the AA-p orbitals, account for the most part of the spectral wei

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77c6f7e4cbf76508497586dd34f1f033
https://doi.org/10.1103/physrevb.102.155149

Lifting of spin blockade by charged impurities in Si-MOS double quantum dot devices

Autor: Belita Koiller, Maria J. Calderon, Susan Coppersmith, Andre Saraiva, Cameron King, Mark Friesen, Hong-Wen Jiang, Joshua S. Schoenfield, Xuedong Hu

Publikováno v: Physical Review B. 101

One obstacle that has slowed the development of electrically gated metal-oxide-semiconductor (MOS) singlet-triplet qubits is the frequent lack of observed spin blockade, even in samples with large singlet-triplet energy splittings. We present theoret

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd5f430d614a760f799324fac30c3740
https://doi.org/10.1103/physrevb.101.155411

Electric-field tuning of the valley splitting in silicon corner dots

Autor: Imtiaz Ahmed, L. Bourdet, David J. Ibberson, S. Barraud, J. C. Abadillo-Uriel, Maria J. Calderon, M. F. Gonzalez-Zalba, Yann-Michel Niquet

Publikováno v: Applied Physics Letters
Applied Physics Letters, 2018, 113 (5), pp.053104. ⟨10.1063/1.5040474⟩
Ibberson, D J, Bourdet, L, Abadillo-Uriel, J C, Ahmed, I, Barraud, S, Calderón, M J, Niquet, Y M & Gonzalez-Zalba, M F 2018, ' Electric-field tuning of the valley splitting in silicon corner dots ', Applied Physics Letters, vol. 113, no. 5, 053104 . https://doi.org/10.1063/1.5040474
Applied Physics Letters, American Institute of Physics, 2018, 113 (5), pp.053104. ⟨10.1063/1.5040474⟩

We perform an excited state spectroscopy analysis of a silicon corner dot in a nanowire field-effect transistor to assess the electric field tunability of the valley splitting. First, we demonstrate a back-gate-controlled transition between a single

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b76530ea44bb2ada51199f2b72868f04
https://hal.science/hal-02141916

Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit

Autor: Dohun Kim, Ryan H. Foote, Maria J. Calderon, Susan Coppersmith, C. B. Simmons, Mark Friesen, Max G. Lagally, Brandur Thorgrimsson, Mark A. Eriksson, J. C. Abadillo-Uriel, L. W. Smith, D. R. Ward, J. Corrigan, Donald E. Savage

We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well interface. By employing tight-binding simulations, we identify potentia

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab5231080d18957a5f0b2e78f98923e9

Strong correlations and the search for high-Tc superconductivity in chromium pnictides and chalcogenides

Autor: Elena Bascones, Jian Liu, Maria J. Calderon, José María Pizarro, M. C. Muñoz

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
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Undoped iron superconductors accommodate n=6 electrons in five d orbitals. Experimental and theoretical evidence shows that the strength of correlations increases with hole doping, as the electronic filling approaches half filling with n=5 electrons.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a482cc7c6a56b17d0e61f942cfaa6f1
http://hdl.handle.net/10261/189258