ORCID Profile
0000-0003-0711-8514
Current Organisation
E O Lawrence Berkeley National Laboratory
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Publisher: American Association for the Advancement of Science (AAAS)
Date: 25-03-2011
Abstract: Three techniques are used to probe the pseudogap state of cuprate high-temperature superconductors.
Publisher: American Chemical Society (ACS)
Date: 13-08-2021
Abstract: Intrinsic magnetic topological insulators offer low disorder and large magnetic band gaps for robust magnetic topological phases operating at higher temperatures. By controlling the layer thickness, emergent phenomena such as the quantum anomalous Hall (QAH) effect and axion insulator phases have been realized. These observations occur at temperatures significantly lower than the Néel temperature of bulk MnBi
Publisher: American Chemical Society (ACS)
Date: 15-01-2020
Publisher: Springer Science and Business Media LLC
Date: 12-2018
DOI: 10.1038/S41586-018-0788-5
Abstract: The electric-field-induced quantum phase transition from topological to conventional insulator has been proposed as the basis of a topological field effect transistor
Publisher: Wiley
Date: 03-02-2021
Publisher: Springer Science and Business Media LLC
Date: 02-11-2015
DOI: 10.1038/NPHYS3527
Publisher: Wiley
Date: 31-03-2022
Abstract: Combining magnetism and nontrivial band topology gives rise to quantum anomalous Hall (QAH) insulators and exotic quantum phases such as the QAH effect where current flows without dissipation along quantized edge states. Inducing magnetic order in topological insulators via proximity to a magnetic material offers a promising pathway toward achieving the QAH effect at a high temperature for lossless transport applications. One promising architecture involves a sandwich structure comprising two single‐septuple layers (1SL) of MnBi 2 Te 4 (a 2D ferromagnetic insulator) with ultrathin few quintuple layer (QL) Bi 2 Te 3 in the middle, and it is predicted to yield a robust QAH insulator phase with a large bandgap greater than 50 meV. Here, the growth of a 1SL MnBi 2 Te 4 /4QL Bi 2 Te 3 /1SL MnBi 2 Te 4 heterostructure via molecular beam epitaxy is demonstrated and the electronic structure probed using angle‐resolved photoelectron spectroscopy. Strong hexagonally warped massive Dirac fermions and a bandgap of 75 ± 15 meV are observed. The magnetic origin of the gap is confirmed by the observation of the exchange‐Rashba effect, as well as the vanishing bandgap above the Curie temperature, in agreement with density functional theory calculations. These findings provide insights into magnetic proximity effects in topological insulators and reveal a promising platform for realizing the QAH effect at elevated temperatures.
Location: United States of America
No related grants have been discovered for Sung-Kwan Mo.