All the thermal cloaks reported in the literature can be used to thermallyhide an object inside the cloak. However, a common limitation of this kind ofthermal cloaks is that the cloaked object cannot feel the external heat flowsince it is located inside the cloak; thus we call these cloaks ``conventionalthermal cloaks''. Here we manage to overcome this limitation by exploiting aclass of unconventional thermal cloaks that enable the cloaked object to feelthe external heat flow. Our finite element simulations in two dimensions showthe desired cloaking effect. The underlying mechanism originates from thecomplementary effect of thermal metamaterials with negative thermalconductivities. This work suggests a different method to design thermal deviceswhere heat conduction can be controlled at will.
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