Thermal gating of charge currents with Coulomb coupled quantum dots

We have observed thermal gating, i.e. electrostatic gating induced by hot electrons. The effect occurs in a device consisting of two capacitively coupled quantum dots. The double dot system is coupled to a hot electron reservoir on one side (QD1), while the conductance of the second dot (QD2) is mon...

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Bibliographic Details
Published in:New journal of physics 2015-10, Vol.17 (11), p.113003
Main Authors: Thierschmann, H, Arnold, F, Mittermüller, M, Maier, L, Heyn, C, Hansen, W, Buhmann, H, Molenkamp, L W
Format: Article
Language:English
Subjects:
73.23.Hk
Charge
Conductance
Control systems
Coulomb interaction
Gating and risering
Hot electrons
Joining
Physics
quantum dot systems
Quantum dots
Reservoirs
Resistance
Temperature dependence
thermal gating
thermoelectrics
three-terminal device
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Summary:We have observed thermal gating, i.e. electrostatic gating induced by hot electrons. The effect occurs in a device consisting of two capacitively coupled quantum dots. The double dot system is coupled to a hot electron reservoir on one side (QD1), while the conductance of the second dot (QD2) is monitored. When a bias across QD2 is applied we observe a current which is strongly dependent on the temperature of the heat reservoir. This current can be either enhanced or suppressed, depending on the relative energetic alignment of the QD levels. Thus, the system can be used to control a charge current by hot electrons.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/11/113003