Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires
Summary: The magnetic-flux-dependent dispersions of sub-bands in topologically protected surface states of a topological insulator nanowire manifest as Aharonov–Bohm oscillations (ABOs) observed in conductance measurements, reflecting the Berry’s phase of π because of the spin-helical surface states...
| Main Authors: | , , , , , |
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| Language: | English |
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Elsevier
2023-01-01
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| Series: | iScience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589004222019642 |
| _version_ | 1797946129780834304 |
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| author | Duhyuk Kwon Bum-Kyu Kim Yong-Joo Doh Dong Yu Jonghyun Song Myung-Ho Bae |
| author_facet | Duhyuk Kwon Bum-Kyu Kim Yong-Joo Doh Dong Yu Jonghyun Song Myung-Ho Bae |
| author_sort | Duhyuk Kwon |
| collection | DOAJ |
| description | Summary: The magnetic-flux-dependent dispersions of sub-bands in topologically protected surface states of a topological insulator nanowire manifest as Aharonov–Bohm oscillations (ABOs) observed in conductance measurements, reflecting the Berry’s phase of π because of the spin-helical surface states. Here, we used thermoelectric measurements to probe a variation in the density of states at the Fermi level of the surface state of a topological insulator nanowire (Sb-doped Bi2Se3) under external magnetic fields and an applied gate voltage. The ABOs observed in the magnetothermovoltage showed 180° out-of-phase oscillations depending on the gate voltage values, which can be used to tune the Fermi wave number and the density of states at the Fermi level. The temperature dependence of the ABO amplitudes showed that the phase coherence was kept to T = 15 K. We suggest that thermoelectric measurements could be applied for investigating the electronic structure at the Fermi level in various quantum materials. |
| first_indexed | 2024-04-10T21:06:03Z |
| format | Article |
| id | doaj.art-08854cb686fe4cb9ba3ab3b4c92a9f67 |
| institution | Directory Open Access Journal |
| issn | 2589-0042 |
| language | English |
| last_indexed | 2024-04-10T21:06:03Z |
| publishDate | 2023-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | iScience |
| spelling | doaj.art-08854cb686fe4cb9ba3ab3b4c92a9f672023-01-22T04:40:26ZengElsevieriScience2589-00422023-01-01261105691Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowiresDuhyuk Kwon0Bum-Kyu Kim1Yong-Joo Doh2Dong Yu3Jonghyun Song4Myung-Ho Bae5Department of Physics, Chungnam National University, Daejeon 34134, Republic of Korea; Korea Research Institute of Standards and Science, Daejeon34113, Republic of KoreaKorea Research Institute of Standards and Science, Daejeon34113, Republic of KoreaDepartment of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju61005, KoreaDepartment of Physics, University of California at Davis, Davis, CA95616, USADepartment of Physics, Chungnam National University, Daejeon 34134, Republic of Korea; Institute of Quantum Systems (IQS), Chungnam National University, Daejeon34134, Republic of Korea; Corresponding authorKorea Research Institute of Standards and Science, Daejeon34113, Republic of Korea; Department of Nano Science, University of Science and Technology, Daejeon, 34113, Republic of Korea; Corresponding authorSummary: The magnetic-flux-dependent dispersions of sub-bands in topologically protected surface states of a topological insulator nanowire manifest as Aharonov–Bohm oscillations (ABOs) observed in conductance measurements, reflecting the Berry’s phase of π because of the spin-helical surface states. Here, we used thermoelectric measurements to probe a variation in the density of states at the Fermi level of the surface state of a topological insulator nanowire (Sb-doped Bi2Se3) under external magnetic fields and an applied gate voltage. The ABOs observed in the magnetothermovoltage showed 180° out-of-phase oscillations depending on the gate voltage values, which can be used to tune the Fermi wave number and the density of states at the Fermi level. The temperature dependence of the ABO amplitudes showed that the phase coherence was kept to T = 15 K. We suggest that thermoelectric measurements could be applied for investigating the electronic structure at the Fermi level in various quantum materials.http://www.sciencedirect.com/science/article/pii/S2589004222019642Quantum solidsThermal propertyEnergy materials |
| spellingShingle | Duhyuk Kwon Bum-Kyu Kim Yong-Joo Doh Dong Yu Jonghyun Song Myung-Ho Bae Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires iScience Quantum solids Thermal property Energy materials |
| title | Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires |
| title_full | Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires |
| title_fullStr | Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires |
| title_full_unstemmed | Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires |
| title_short | Quantum interference probed by the thermovoltage in Sb-doped Bi2Se3 nanowires |
| title_sort | quantum interference probed by the thermovoltage in sb doped bi2se3 nanowires |
| topic | Quantum solids Thermal property Energy materials |
| url | http://www.sciencedirect.com/science/article/pii/S2589004222019642 |
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