TY  - JOUR
A1  - Thierschmann, H
A1  - Arnold, F
A1  - Mittermüller, M
A1  - Maier, L
A1  - Heyn, C
A1  - Hansen, W
A1  - Buhmann, H
A1  - Molenkamp, L W
T1  - Thermal gating of charge currents with Coulomb coupled quantum dots
JF  - New Journal of Physics
N2  - 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.
KW  - oscillations
KW  - physics
KW  - quantum dot systems
KW  - Coulomb interaction
KW  - thermal gating
KW  - three terminal device
KW  - thermoelectrics
KW  - energy
KW  - thermopower
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-145196
VL  - 17
IS  - 113003
ER  - 
TY  - JOUR
A1  - Thierschmann, H.
A1  - Henke, M.
A1  - Knorr, J.
A1  - Maier, L.
A1  - Heyn, C.
A1  - Hansen, W.
A1  - Buhmann, H.
A1  - Molenkamp, L. W.
T1  - Diffusion thermopower of a serial double quantum dot
JF  - New Journal of Physics
N2  - We have experimentally studied the diffusion thermopower of a serial double quantum dot, defined electrostatically in a GaAs/AlGaAs heterostructure. We present the thermopower stability diagram for a temperature difference 1T = (20±10)mK across the device and find a maximum thermovoltage signal of several μV in the vicinity of the triple points. Along a constant energy axis in this regime, the data show a characteristic pattern which is in agreement with Mott’s relation and can be well understood within a model of sequential transport.
KW  - quantum dot
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-129714
VL  - 15
IS  - 123010
ER  -