Microwave Induced Zero-Conductance State in a Corbino Geometry 2D Electron Gas with Capacitive Contacts

TL;DR

This study demonstrates microwave-induced zero-conductance states in a 2D electron gas with capacitive contacts in a Corbino geometry, showing these states are independent of contact type and occur at low temperatures and magnetic fields.

Contribution

It reveals that zero-conductance states can be observed in 2DEG with capacitive contacts, extending understanding beyond ohmic contact systems.

Findings

Zero-conductance states observed with capacitive contacts.

Contact type does not significantly affect the zero-conductance states.

States occur at low temperature and magnetic field.

Abstract

Microwave induced photoconductivity of a two-dimensional electron gas (2DEG) in selectively-doped GaAs/AlAs heterostructures has been studied using the Corbino geometry with capacitive contacts at a temperature T=1.6K and magnetic field B up to 0.5 T. Zero-conductance states have been observed in the samples under study subject to microwave radiation, similarly to the samples with ohmic contacts. It has been shown that ohmic contacts do not play a significant role for observation of zero-conductance states induced by microwave radiation