Abstract
Periodic Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations have traditionally been observed in lateral transport through patterned mesoscopic loops of diffusive conductors. However, our studies of perpendicular-to-plane magnetotransport in straight-channel, diffusive devices of epitaxial Bi 2Se3 surprisingly reveal signatures of Aharonov-Bohm orbits, periodic conductance fluctuation magneto-fingerprints, even though the devices are not explicitly patterned into loops. We show that the length scale of these orbits corresponds to the typical perimeter of triangular terraces found on the surface of these thin film devices, strongly suggesting that the periodic magneto-fingerprint arises from coherent scattering of electron waves from the step-edges. Our interpretation is bolstered by control measurements in devices without such surface morphology that only show a conventional, aperiodic magneto-fingerprint. These results show that lithographically patterned Bi 2Se3 devices provide a novel class of mesoscopic physical systems for systematic studies of coherent surface sensitive transport.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2471-2476 |
| Number of pages | 6 |
| Journal | Nano letters |
| Volume | 13 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 12 2013 |
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All Science Journal Classification (ASJC) codes
- Bioengineering
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
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Surface-sensitive two-dimensional magneto-fingerprint in mesoscopic Bi 2Se3 channels. / Kandala, Abhinav; Richardella, Anthony Raymond; Zhang, Duming; Flanagan, Thomas C.; Samarth, Nitin.
In: Nano letters, Vol. 13, No. 6, 12.06.2013, p. 2471-2476.Research output: Contribution to journal › Article
TY - JOUR
T1 - Surface-sensitive two-dimensional magneto-fingerprint in mesoscopic Bi 2Se3 channels
AU - Kandala, Abhinav
AU - Richardella, Anthony Raymond
AU - Zhang, Duming
AU - Flanagan, Thomas C.
AU - Samarth, Nitin
PY - 2013/6/12
Y1 - 2013/6/12
N2 - Periodic Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations have traditionally been observed in lateral transport through patterned mesoscopic loops of diffusive conductors. However, our studies of perpendicular-to-plane magnetotransport in straight-channel, diffusive devices of epitaxial Bi 2Se3 surprisingly reveal signatures of Aharonov-Bohm orbits, periodic conductance fluctuation magneto-fingerprints, even though the devices are not explicitly patterned into loops. We show that the length scale of these orbits corresponds to the typical perimeter of triangular terraces found on the surface of these thin film devices, strongly suggesting that the periodic magneto-fingerprint arises from coherent scattering of electron waves from the step-edges. Our interpretation is bolstered by control measurements in devices without such surface morphology that only show a conventional, aperiodic magneto-fingerprint. These results show that lithographically patterned Bi 2Se3 devices provide a novel class of mesoscopic physical systems for systematic studies of coherent surface sensitive transport.
AB - Periodic Aharonov-Bohm and Altshuler-Aronov-Spivak oscillations have traditionally been observed in lateral transport through patterned mesoscopic loops of diffusive conductors. However, our studies of perpendicular-to-plane magnetotransport in straight-channel, diffusive devices of epitaxial Bi 2Se3 surprisingly reveal signatures of Aharonov-Bohm orbits, periodic conductance fluctuation magneto-fingerprints, even though the devices are not explicitly patterned into loops. We show that the length scale of these orbits corresponds to the typical perimeter of triangular terraces found on the surface of these thin film devices, strongly suggesting that the periodic magneto-fingerprint arises from coherent scattering of electron waves from the step-edges. Our interpretation is bolstered by control measurements in devices without such surface morphology that only show a conventional, aperiodic magneto-fingerprint. These results show that lithographically patterned Bi 2Se3 devices provide a novel class of mesoscopic physical systems for systematic studies of coherent surface sensitive transport.
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U2 - 10.1021/nl4012358
DO - 10.1021/nl4012358
M3 - Article
C2 - 23642037
AN - SCOPUS:84879094009
VL - 13
SP - 2471
EP - 2476
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 6
ER -