Pressure- and temperature-driven phase transitions in HgTe quantum wells

Sergey S. Krishtopenko (1) , I. Yahniuk , Dmytro But (1) , V. I. Gavrilenko , Wojciech Knap (1) , Frederic Teppe (1)

1 L2C - Laboratoire Charles Coulomb

We present theoretical investigations of pressure- and temperature-driven phase transitions in HgTequantumwells grown on a CdTe buffer. Using the eight-band k·p Hamiltonian we calculate evolution of energy-band structure at different quantum well widths with hydrostatic pressure up to 20 kbars and temperature ranging up to 300 K. In particular, we show that, in addition to temperature, tuning of hydrostatic pressure allows us to drive transitions between semimetal, band insulator, and topological insulator phases. Our realistic band-structure calculations reveal that the band inversion under hydrostatic pressure and temperature may be accompanied by nonlocal overlapping between conduction and valence bands. The pressure and temperature phase diagrams are presented.

Domaines: Physique Quantique [quant-ph]; Science des matériaux [cond-mat.mtrl-sci]; Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Sergey S. Krishtopenko, I. Yahniuk, Dmytro But, V. I. Gavrilenko, Wojciech Knap, et al.. Pressure- and temperature-driven phase transitions in HgTe quantum wells. Physical Review B, 2016, 94 (24), pp.245402. ⟨10.1103/PhysRevB.94.245402⟩. ⟨hal-01469290⟩