Quantum engineered systems

Quantum transport, quantum information, and measurement theory in mesoscopic devices

We are interested in the study of the out-of-equilibrium interplay between coherent transport and quantum measurement in mesoscopic devices. This work involves translation of fundamental ideas and protocols from measurement theory to realistic microscopic models for various applications such as quantum information processing and metrology. Similarly, it involves the study of signatures of many-body electronic phenomena such as signals of interfering exotic quaiparticles (anyons) and phase transitions.

• Emergent cavity junction around metal-on-graphene contacts, Y. Zhao, M. Kapfer, K. Watanabe, T. Taniguchi, OZ, and B. S. Jessen, [arXiv:2408.10973].
• Coherent exchange-coupled nonlocal Kondo impurities, L. Stocker and OZ, Phys. Rev. Research 6, L022058 (2024) [arXiv:2308.16009].
• Fractional quantum Hall edge polaritons, L. Winter and OZ, [arXiv:2308.12146].
• Electron-optics using negative refraction in two-dimensional inverted-band pn junctions, Y. Zhao, A. Leuch, OZ, and A. Štrkalj, Phys. Rev. B 108, 195301 (2023) [arXiv:2307.07913].
• Tomasch oscillations as above-gap signature of topological superconductivity, A. Štrkalj, X.-R. Chen, W. Chen, D. Y. Xing, and OZ, Phys. Rev. Lett. 132, 066301 (2024) [arXiv:2305.09530].
• Fractional transconductance via non-adiabatic topological Cooper pair pumping, H. Weisbrich, R. L. Klees, OZ, and W. Belzig, Phys. Rev. Research 5, 043045 (2023) [arXiv:2212.11757].
• Entanglement-based observables for quantum impurities, L. Stocker, S. H. Sack, M. S. Ferguson, and OZ, Phys. Rev. Research 4, 043177 (2022) [arXiv:2201.07461].
• An impurity in a Luttinger Liquid coupled to Ohmic-class environments, Andisheh Khedri, Antonio Štrkalj, and OZ Phys. Rev. Research 3, L032013 (2021) [arXiv:2012.04628].
• Open quantum systems beyond Fermi's golden rule: Diagrammatic expansion of the steady-state time-convolutionless master equation, M. S. Ferguson, OZ, and G. Blatter Phys. Rev. Research 3, 023127 (2021) [arXiv:2010.09838].
• Measurement-induced population switching, M. S. Ferguson, L. C. Camenzind, C. Müller, D. E. F. Biesinger, C. P. Scheller, B. Braunecker, D. M. Zumbühl, and OZ, Phys. Rev. Research 5, 023028 (2023) [arXiv:2010.04635].
• Spontaneous valley spirals in magnetically encapsulated twisted bilayer graphene, T. M. R. Wolf, OZ, G. Blatter, and J. L. Lado, Phys. Rev. Lett. 126, 056803 (2021) [arXiv:2008.06441].
• Detection of Fermi arcs in Weyl semimetals through surface negative refraction, G. Chen, OZ, W. Chen, Phys. Rev. B 101, 125407 (2020) [arXiv:1911.04941].
• Electron-hole interference in an inverted-band semiconductor bilayer, M. Karalic, A. Štrkalj, M. Masseroni, W. Chen, C. Mittag, T. Tschirky, W. Wegscheider, T. Ihn, K. Ensslin, and OZ, Phys. Rev. X 10, 031007 (2020) [arXiv:1911.00424].
• Field-effect transistor based on surface negative refraction in Weyl nanowires, G. Chen, W. Chen, and OZ, APL Mat. 8, 011102 (2020) [arXiv:1908.11102].
• Electrically-tunable flat bands and magnetism in twisted bilayer graphene, T. M. R. Wolf, J. L. Lado, G. Blatter, and OZ, Phys. Rev. Lett. 123, 096802 (2019) [arXiv:1905.07651].
• Weak localization and antilocalization in nodal-line semimetals: dimensionality and topological effects, W. Chen, H.-Z. Lu, and OZ, Phys. Rev. Lett. 122, 196603 (2019) [arXiv:1902.06921].
• Sensing electrons during an adiabatic coherent transport passage, OZ and A. Romito, Phys. Rev. B 99, 165422 (2019) [arXiv:1901.10057].
• Tunneling into a finite Luttinger liquid coupled to noisy capacitive leads, A. Štrkalj, M. S. Ferguson, T. M. R. Wolf, I. Levkivskyi, and OZ, Phys. Rev. Lett. 122, 126802 (2019) [arXiv:1809.01631].
• Substrate-induced topological mini-bands in graphene, T. M. R. Wolf, OZ, I. Levkivskyi, and G. Blatter, Phys. Rev. B 98, 125408 (2018) [arXiv:1805.10670].
• Proposal for detecting nodal-line semimetal surface states with resonant spin-flipped reflection, W. Chen, K. Luo, L. Li, and OZ, Phys. Rev. Lett. 121, 166802 (2018) [arXiv:1801.10337].
• Cavity-mediated coherent coupling between distant quantum dots, G. Nicolí, M. S. Ferguson, C. Rössler, A. Wolfertz, G. Blatter, T. Ihn, K. Ensslin, C. Reichl, W. Wegscheider, and OZ, Phys. Rev. Lett. 120, 236801 (2018) [arXiv:1712.08569].
• Long-range spin-coherence in a strongly-coupled all electronic dot-cavity system, M. S. Ferguson, D. Oehri, C. Rössler, T. Ihn, K. Ensslin, G. Blatter, and OZ, Phys. Rev. B 96, 235431 (2017) [arXiv:1705.11145].
• Transport spectroscopy of singlet-triplet quantum dot states coupled to electronic cavities, M. S. Ferguson, C. Rössler, T. Ihn, K. Ensslin, G. Blatter, and OZ, [arXiv:1612.03850].
• Many-body manifestation of interaction-free measurement: the Elitzur-Vaidman bomb, OZ, A. Romito, and Y. Gefen, Phys. Rev. B 93, 115411 (2016) [arXiv:1512.01086].
• Measurement back-action in stacked graphene quantum dots, D. Bischoff, M. Eich, OZ, C. Rössler, T. Ihn, and K. Ensslin, Nano Lett. 15, 6003 (2015) [arXiv:1602.08603].
• Transport Spectroscopy of a Spin-Coherent Dot-Cavity System, C. Rössler, D. Oehri, OZ, G. Blatter, M. Karalic, J. Pijnenburg, A. Hofmann, T. Ihn, K. Ensslin, C. Reichl, and W. Wegscheider, Phys. Rev. Lett. 115, 166603 (2015) (Editor's suggestion) [arXiv:1503.02928]. It received a Physics viewpoint: Physics 8, 98 (2015).
• Measuring cotunneling in its wake, OZ, A. Carmi, and A. Romito, Phys. Rev. B 90, 205413 (2014) [arXiv:1403.5897].
• Hanbury-Brown and Twiss correlations in quantum Hall systems, G. Campagnano, OZ, I. V. Gornyi, and Y. Gefen, Phys. Rev. B 88, 235415 (2013) (Editor's suggestion) [arXiv:1309.6418].
• Standard and Null Weak Values, OZ, A. Romito, and Y. Gefen, appeared in a festschrift in honor of Yakir Aharonov's 80th birthday "Quantum Theory: A Two-Time Success Story" [arXiv:1304.1642].
• Null weak values in multi-level systems, OZ, A. Romito, and Y. Gefen, Physica Scripta T151, 014014 (2012) [arXiv:1304.1640].
• Null values and quantum state discrimination, OZ, A. Romito, D. J. Starling, G. A. Howland, C. J. Broadbent, J. C. Howell, and Y. Gefen, Phys. Rev. Lett. 110, 170405 (2013) [arXiv:1205.3877].
• Hanbury-Brown and Twiss interference of anyons, G. Campagnano, OZ, I. V. Gornyi, D. E. Feldman, A. C. Potter,, and Y. Gefen, Phys. Rev. Lett. 109, 106802 (2012) [arXiv:1204.2129] which received a Physics synopsis.
• Charge sensing amplification via weak values measurement, OZ, A. Romito, and Y. Gefen, Phys. Rev. Lett. 106, 080405 (2011) [arXiv:1009.4738] which was listed in Virtual J. of Nanotech. 23(9) (2011).
• Controlled-NOT for multiparticle qubits and topological quantum computation based on parity measurements, OZ, B. Braunecker, and D. Loss, Phys. Rev. A 77, 012327 (2008), [arXiv:0708.1062].
• Daubechies wavelets as a basis set for density functional pseudopotential calculations, J. Chem. Phys. 129, 014109 (2008), [arXiv:0804.2583].