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Induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures.

Wan Z, Kazakov A, Manfra MJ, Pfeiffer LN, West KW, Rokhinson LP - Nat Commun (2015)

Bottom Line: Search for Majorana fermions renewed interest in semiconductor-superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime.Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor-superconductor ohmic contacts.High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.

ABSTRACT
Search for Majorana fermions renewed interest in semiconductor-superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime. Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor-superconductor ohmic contacts. Supercurrent with characteristic temperature dependence of a ballistic junction has been observed across 0.6 μm, a regime previously achieved only in point contacts but essential to the formation of well separated non-Abelian states. High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.

No MeSH data available.


Related in: MedlinePlus

Induced superconductivity in a high-mobility 2D electron gas in GaAs.Voltage-current characteristics (a,b) and differential resistance (c,d) for samples A (a,c) and B (b,d). The conduction is measured between contacts (8-9) for sample A and (3-4) for sample B. dV/dI is measured with Ia.c.=1 nA. Induced superconductivity with zero voltage is observed with critical currents Ic∼220 nA for sample A and Ic∼230 for sample B. Red (blue) traces are for current increasing (decreasing).
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f2: Induced superconductivity in a high-mobility 2D electron gas in GaAs.Voltage-current characteristics (a,b) and differential resistance (c,d) for samples A (a,c) and B (b,d). The conduction is measured between contacts (8-9) for sample A and (3-4) for sample B. dV/dI is measured with Ia.c.=1 nA. Induced superconductivity with zero voltage is observed with critical currents Ic∼220 nA for sample A and Ic∼230 for sample B. Red (blue) traces are for current increasing (decreasing).

Mentions: Voltage–current V(I) characteristics for two S–2DEG–S junctions (between contacts 8 and 9 for sample A, and 3 and 4 for sample B) are shown in Fig. 2. Both the samples show zero-resistance state at small currents with abrupt switching into resistive state at critical currents Ic=0.22 and 0.23 μA for samples A and B, respectively. We attribute hysteresis in V(I) characteristics to Joule heating in the normal state.


Induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures.

Wan Z, Kazakov A, Manfra MJ, Pfeiffer LN, West KW, Rokhinson LP - Nat Commun (2015)

Induced superconductivity in a high-mobility 2D electron gas in GaAs.Voltage-current characteristics (a,b) and differential resistance (c,d) for samples A (a,c) and B (b,d). The conduction is measured between contacts (8-9) for sample A and (3-4) for sample B. dV/dI is measured with Ia.c.=1 nA. Induced superconductivity with zero voltage is observed with critical currents Ic∼220 nA for sample A and Ic∼230 for sample B. Red (blue) traces are for current increasing (decreasing).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4490403&req=5

f2: Induced superconductivity in a high-mobility 2D electron gas in GaAs.Voltage-current characteristics (a,b) and differential resistance (c,d) for samples A (a,c) and B (b,d). The conduction is measured between contacts (8-9) for sample A and (3-4) for sample B. dV/dI is measured with Ia.c.=1 nA. Induced superconductivity with zero voltage is observed with critical currents Ic∼220 nA for sample A and Ic∼230 for sample B. Red (blue) traces are for current increasing (decreasing).
Mentions: Voltage–current V(I) characteristics for two S–2DEG–S junctions (between contacts 8 and 9 for sample A, and 3 and 4 for sample B) are shown in Fig. 2. Both the samples show zero-resistance state at small currents with abrupt switching into resistive state at critical currents Ic=0.22 and 0.23 μA for samples A and B, respectively. We attribute hysteresis in V(I) characteristics to Joule heating in the normal state.

Bottom Line: Search for Majorana fermions renewed interest in semiconductor-superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime.Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor-superconductor ohmic contacts.High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA.

ABSTRACT
Search for Majorana fermions renewed interest in semiconductor-superconductor interfaces, while a quest for higher-order non-Abelian excitations demands formation of superconducting contacts to materials with fractionalized excitations, such as a two-dimensional electron gas in a fractional quantum Hall regime. Here we report induced superconductivity in high-mobility two-dimensional electron gas in gallium arsenide heterostructures and development of highly transparent semiconductor-superconductor ohmic contacts. Supercurrent with characteristic temperature dependence of a ballistic junction has been observed across 0.6 μm, a regime previously achieved only in point contacts but essential to the formation of well separated non-Abelian states. High critical fields (>16 T) in NbN contacts enables investigation of an interplay between superconductivity and strongly correlated states in a two-dimensional electron gas at high magnetic fields.

No MeSH data available.


Related in: MedlinePlus