[Th-P] Topological States of Matter

[Th-P-47] High density two-dimensional Dirac fermion gas in HgTe quantum wells
of critical width

Gennady Gusev¹, 〇Z D Kvon², E B Olshanecky², N N Mikhailov², M L Savchenko^2,4, D A Khudaiberdiev³, P Beck-Mannagetta³, A Pimenov³ (1. Institute of Physics, University of São Paulo, São Paulo 135960-170 (Brazil), 2. Institute of Semiconductor Physics,630090, Novosibirsk, pr.Lavrentyeva,13 (Russia), 3. Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria (Austria), 4. Silicon Austria Labs GmbH, Europastraße 12, 9500 Villach, Austria (Austria))

Magnetotransport and terahertz cyclotron resonance studies of 6.2 nm HgTe quantum wells show that Dirac fermions retain a linear energy spectrum up to N_s = 5.6 x 10¹² cm ^-2 .This is the upper density limit and gives a conduction band offset of 0.35 eV.