L C Mur et al 2008 New J. Phys. 10 073031 doi:10.1088/1367-2630/10/7/073031
Competition between h/e and h/2e oscillations in a semiconductor Aharonov–Bohm interferometer
L C Mur1,3, C J P M Harmans1 and W G van der Wiel2,4
Show affiliationsThe magnetoresistance of a quasi-ballistic Aharonov–Bohm (AB) ring defined in the two-dimensional electron gas (2DEG) of an InP/In0.8Ga0.2As quantum well is studied. The ring is connected to an Al contact on one side and to a 2DEG reservoir at the other side. Two distinct magnetic field regimes can be identified. At magnetic field values where time-reversal symmetry (TRS) is broken, AB oscillations are observed. Besides oscillations with h/e periodicity, we also observe higher harmonics with h/2e and h/3e periods. In the low-magnetic field range, where TRS is preserved, the AB oscillations are alternately dominated by the h/e or h/2e component, depending on the bias voltage. Although Al is superconducting at these low magnetic fields, no evidence is found that the observed AB oscillations are related to the proximity of the superconductor. The bias voltage dependence is qualitatively described in terms of a 1D scattering model.
- PACS
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74.45.+c Proximity effects; Andreev effect; SN and SNS junctions
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 7 (July 2008)
Received 21 March 2008
Published 16 July 2008
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Competition between h/e and h/2e oscillations in a semiconductor Aharonov–Bohm interferometer
L C Mur et al 2008 New J. Phys. 10 073031
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