Electrically controlled two-dimensional electron-hole fluids
ORAL
Abstract
Recent advances in experimental techniques have opened up the possibility of electrical control of electron-hole bilayer systems. In this talk I will discuss the electronic properties of a dual-gated electron-hole bilayer in which the two layers are separated by a perfectly opaque tunnel barrier. Combining an electrostatic and thermodynamic analysis [1] with mean-field theory estimates of interacting system chemical potentials, we explain the dependence of the electron and hole densities on the two gate voltages. We find a finite area in gate voltage parameter space over which electron and hole densities are equal and the electron-hole pair density depends only on the bias voltage which acts like a chemical potential for excitons. I will briefly discuss the transport properties of exciton circuits formed in systems with two or more exciton reservoirs, and a recent related experimental study [2] of electrically controlled bilayers that realizes a non-equilibrium steady-state instead of a quasi-equilibrium.
[1] Y. Zeng and A. H. MacDonald. Phys. Rev. B 102, 085154 (2020).
[2] Z. Wang, et al. Nature 574, 7776 (2019).
[1] Y. Zeng and A. H. MacDonald. Phys. Rev. B 102, 085154 (2020).
[2] Z. Wang, et al. Nature 574, 7776 (2019).
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Presenters
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Yongxin Zeng
University of Texas at Austin
Authors
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Yongxin Zeng
University of Texas at Austin
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Allan MacDonald
Physics, University of Texas at Austin, Physics Department, University of Texas at Austin, University of Texas at Austin, Department of physics, University of Texas at Austin, Department of Physics, University of Texas at Austin, University of Texas, Austin