Rebekka Garreis

Nov 8, 2024 | nature.com | Andraz Omahen |Michele Masseroni |Chuyao Tong |Rebekka Garreis |Jonas Gerber |Wister Wei Huang | +4 more

DeviceThe device is based on a stack of two-dimensional materials as illustrated on Fig. 1a, which was assembled using the standard dry transfer technique28,29,30. It consists of a 35 nm thick top hBN layer, the Bernal BLG sheet, a 28 nm thick bottom hBN, and a graphite backgate layer. The BLG was subsequently contacted with 1D edge contacts28. Three metallic top gates (3 nm Cr, 20 nm Au) were evaporated on top of the stack to define two conducting channels.

Jan 17, 2024 | nature.com | Rebekka Garreis |Chuyao Tong |Max Josef Ruckriegel |Jonas Gerber |Lisa Maria Gächter |Kenji Watanabe | +3 more

AbstractBilayer graphene is a promising platform for electrically controllable qubits in a two-dimensional material. Of particular interest is the ability to encode quantum information in the valley degree of freedom, a two-fold orbital degeneracy that arises from the symmetry of the hexagonal crystal structure. The use of valleys could be advantageous, as known spin- and orbital-mixing mechanisms are unlikely to be at work for valleys, promising more robust qubits.