%APark, Sang%ASammon, Michael%AMele, Eugene%ALow, Tony%BJournal Name: Nature Communications; Journal Volume: 13; Journal Issue: 1; Related Information: CHORUS Timestamp: 2022-12-15 17:04:48 %D2022%INature Publishing Group %JJournal Name: Nature Communications; Journal Volume: 13; Journal Issue: 1; Related Information: CHORUS Timestamp: 2022-12-15 17:04:48 %K %MOSTI ID: 10385037 %PMedium: X %TPlasmonic gain in current biased tilted Dirac nodes %X
Surface plasmons, which allow tight confinement of light, suffer from high intrinsic electronic losses. It has been shown that stimulated emission from excited electrons can transfer energy to plasmons and compensate for the high intrinsic losses. To-date, these realizations have relied on introducing an external gain media coupled to the surface plasmon. Here, we propose that plasmons in two-dimensional materials with closely located electron and hole Fermi pockets can be amplified, when an electrical current bias is applied along the displaced electron-hole pockets, without the need for an external gain media. As a prototypical example, we consider WTe2from the family of 1T