Details
| Original language | English |
|---|---|
| Article number | 075431 |
| Journal | Physical Review B |
| Volume | 104 |
| Issue number | 7 |
| Publication status | Published - 17 Aug 2021 |
Abstract
The complex behavior of magnetoconductance of Bi films grown epitaxially on Si(111) with a thickness of 20-100 bilayers (BL) was measured at T= 9 K in magnetic fields up to B=4T, oriented in-plane parallel and perpendicular to the electric dc current I. Contributions to magnetoconductance (MC) by diffuse scattering, by weak localization (WL) as well as by weak antilocalization (WAL) were identified. All these components to MC turned out to be isotropic in two dimensions, i.e., no dependence on angle between B and I within the surface plane was found. Only for BI an increase of MC was detected that is, to first approximation, B2. It is ascribed to ballistic scattering between the Rashba-split interfaces that allow Umklapp scattering without spin flip. While MC within the surface states, dominant at small thicknesses, d, shows negligible diffuse scattering under the chosen geometry, their quantum corrections are characterized by WAL with α=-0.3 and a coupling strength that decays 1/d with layer thickness. The admixing of quantized bulk states, which dominates MC above 50 BL, not only increases diffuse scattering, it introduces WL in combination with WAL. Presumably due to hybridization with the surface states, it also modifies strongly the WAL component for d>60 BL. Thus our findings suggest an intriguing interplay in magnetotransport between 2D and quantized 3D states at the Fermi surface of ultrathin bismuth quantum films and provide further deep insight into the electronic transport in quantized and partly spin split bands.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B, Vol. 104, No. 7, 075431, 17.08.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Magnetoconductance in epitaxial bismuth quantum films
T2 - Beyond weak (anti)localization
AU - Abdelbarey, Doaa
AU - Koch, Julian
AU - Kröger, Philipp
AU - Yogi, Priyanka
AU - Tegenkamp, Christoph
AU - Pfnür, Herbert
N1 - Funding Information: This work has been supported by the Deutsche Forschungsgemeinschaft through Projects No. Pf238/31 and No. Te386/17-1.
PY - 2021/8/17
Y1 - 2021/8/17
N2 - The complex behavior of magnetoconductance of Bi films grown epitaxially on Si(111) with a thickness of 20-100 bilayers (BL) was measured at T= 9 K in magnetic fields up to B=4T, oriented in-plane parallel and perpendicular to the electric dc current I. Contributions to magnetoconductance (MC) by diffuse scattering, by weak localization (WL) as well as by weak antilocalization (WAL) were identified. All these components to MC turned out to be isotropic in two dimensions, i.e., no dependence on angle between B and I within the surface plane was found. Only for BI an increase of MC was detected that is, to first approximation, B2. It is ascribed to ballistic scattering between the Rashba-split interfaces that allow Umklapp scattering without spin flip. While MC within the surface states, dominant at small thicknesses, d, shows negligible diffuse scattering under the chosen geometry, their quantum corrections are characterized by WAL with α=-0.3 and a coupling strength that decays 1/d with layer thickness. The admixing of quantized bulk states, which dominates MC above 50 BL, not only increases diffuse scattering, it introduces WL in combination with WAL. Presumably due to hybridization with the surface states, it also modifies strongly the WAL component for d>60 BL. Thus our findings suggest an intriguing interplay in magnetotransport between 2D and quantized 3D states at the Fermi surface of ultrathin bismuth quantum films and provide further deep insight into the electronic transport in quantized and partly spin split bands.
AB - The complex behavior of magnetoconductance of Bi films grown epitaxially on Si(111) with a thickness of 20-100 bilayers (BL) was measured at T= 9 K in magnetic fields up to B=4T, oriented in-plane parallel and perpendicular to the electric dc current I. Contributions to magnetoconductance (MC) by diffuse scattering, by weak localization (WL) as well as by weak antilocalization (WAL) were identified. All these components to MC turned out to be isotropic in two dimensions, i.e., no dependence on angle between B and I within the surface plane was found. Only for BI an increase of MC was detected that is, to first approximation, B2. It is ascribed to ballistic scattering between the Rashba-split interfaces that allow Umklapp scattering without spin flip. While MC within the surface states, dominant at small thicknesses, d, shows negligible diffuse scattering under the chosen geometry, their quantum corrections are characterized by WAL with α=-0.3 and a coupling strength that decays 1/d with layer thickness. The admixing of quantized bulk states, which dominates MC above 50 BL, not only increases diffuse scattering, it introduces WL in combination with WAL. Presumably due to hybridization with the surface states, it also modifies strongly the WAL component for d>60 BL. Thus our findings suggest an intriguing interplay in magnetotransport between 2D and quantized 3D states at the Fermi surface of ultrathin bismuth quantum films and provide further deep insight into the electronic transport in quantized and partly spin split bands.
UR - http://www.scopus.com/inward/record.url?scp=85114027006&partnerID=8YFLogxK
U2 - 10.1103/physrevb.104.075431
DO - 10.1103/physrevb.104.075431
M3 - Article
AN - SCOPUS:85114027006
VL - 104
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 7
M1 - 075431
ER -