  Recently, many exotic electronic states, such as quantum spin liquid (QSL)
and superconductivity (SC), have been extensively discovered and introduced in
layered transition metal dichalcogenides 1T-TaS2 by controlling their complex
correlated charge-density-wave (CDW) states. However, few studies have focused
on its hysteretic electronic phase transitions based on the in-depth discussion
of the delicate interplay among temperature-dependent electronic interactions.
Here, we reported a sequence of spatial electronic phase transitions in the
hysteresis temperature range of 1T-TaS2 via variable-temperature scanning
tunneling microscopy (VT-STM). The emergence, evolution, coexistence, and
separation of diverse novel electronic states within the commensurate
CDW/triclinic CDW (CCDW/TCDW) phase are investigated in detail through the
warming/cooling process. These novel emergent electronic states can be
attributed to the delicate temperature-dependent competition and/or cooperation
of interlayer interactions, intralayer electron-electron correlation, and
electron-phonon (e-ph) coupling of 1T-TaS2. Our results not only provide a
novel insight to understand the hysteretic electronic phase transitions of
correlated CDW state, but also pave a way to realize more exotic quantum states
by accurately and effectively controlling various interactions in correlated
materials.
